def dust_transmission(wave,ebv):
Rv = 3.1
extinction = ext_odonnell(wave,Rv=Rv)
return 10**(-Rv*ebv[:,None]*extinction[None,:]/2.5)
def simulate_one_healpix(ifilename,args,model,obsconditions,decam_and_wise_filters,
bassmzls_and_wise_filters,footprint_healpix_weight,
footprint_healpix_nside,
bal=None,sfdmap=None,eboss=None) :
log = get_logger()
# open filename and extract basic HEALPix information
pixel, nside, hpxnest = get_healpix_info(ifilename)
# using global seed (could be None) get seed for this particular pixel
global_seed = args.seed
seed = get_pixel_seed(pixel, nside, global_seed)
# use this seed to generate future random numbers
np.random.seed(seed)
# get output file (we will write there spectra for this HEALPix pixel)
ofilename = get_spectra_filename(args,nside,pixel)
# get directory name (we will also write there zbest file)
pixdir = os.path.dirname(ofilename)
# get filename for truth file
truth_filename = get_truth_filename(args,pixdir,nside,pixel)
# get filename for zbest file
zbest_filename = get_zbest_filename(args,pixdir,nside,pixel)
if not args.overwrite :
# check whether output exists or not
if args.zbest :
if os.path.isfile(ofilename) and os.path.isfile(zbest_filename) :
log.info("skip existing {} and {}".format(ofilename,zbest_filename))
return
else : # only test spectra file
if os.path.isfile(ofilename) :
log.info("skip existing {}".format(ofilename))
return
# create sub-directories if required
if len(pixdir)>0 :
if not os.path.isdir(pixdir) :
log.info("Creating dir {}".format(pixdir))
os.makedirs(pixdir)
log.info("Read skewers in {}, random seed = {}".format(ifilename,seed))
# Read transmission from files. It might include DLA information, and it
# might add metal transmission as well (from the HDU file).
log.info("Read transmission file {}".format(ifilename))
trans_wave, transmission, metadata, dla_info = read_lya_skewers(ifilename,read_dlas=(args.dla=='file'),add_metals=args.metals_from_file,add_lyb=args.add_LYB)
### Add Finger-of-God, before generate the continua
log.info("Add FOG to redshift with sigma {} to quasar redshift".format(args.sigma_kms_fog))
DZ_FOG = args.sigma_kms_fog/c*(1.+metadata['Z'])*np.random.normal(0,1,metadata['Z'].size)
metadata['Z'] += DZ_FOG
### Select quasar within a given redshift range
w = (metadata['Z']>=args.zmin) & (metadata['Z']<=args.zmax)
transmission = transmission[w]
metadata = metadata[:][w]
DZ_FOG = DZ_FOG[w]
# option to make for BOSS+eBOSS
if not eboss is None:
if args.downsampling or args.desi_footprint:
raise ValueError("eboss option can not be run with "
+"desi_footprint or downsampling")
# Get the redshift distribution from SDSS
selection = sdss_subsample_redshift(metadata["RA"],metadata["DEC"],metadata['Z'],eboss['redshift'])
log.info("Select QSOs in BOSS+eBOSS redshift distribution {} -> {}".format(metadata['Z'].size,selection.sum()))
if selection.sum()==0:
log.warning("No intersection with BOSS+eBOSS redshift distribution")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
# figure out the density of all quasars
N_highz = metadata['Z'].size
# area of healpix pixel, in degrees
area_deg2 = healpy.pixelfunc.nside2pixarea(nside,degrees=True)
input_highz_dens_deg2 = N_highz/area_deg2
selection = sdss_subsample(metadata["RA"], metadata["DEC"],
input_highz_dens_deg2,eboss['footprint'])
log.info("Select QSOs in BOSS+eBOSS footprint {} -> {}".format(transmission.shape[0],selection.size))
if selection.size == 0 :
log.warning("No intersection with BOSS+eBOSS footprint")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
if args.desi_footprint :
footprint_healpix = footprint.radec2pix(footprint_healpix_nside, metadata["RA"], metadata["DEC"])
selection = np.where(footprint_healpix_weight[footprint_healpix]>0.99)[0]
log.info("Select QSOs in DESI footprint {} -> {}".format(transmission.shape[0],selection.size))
if selection.size == 0 :
log.warning("No intersection with DESI footprint")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
nqso=transmission.shape[0]
if args.downsampling is not None :
if args.downsampling <= 0 or args.downsampling > 1 :
log.error("Down sampling fraction={} must be between 0 and 1".format(args.downsampling))
raise ValueError("Down sampling fraction={} must be between 0 and 1".format(args.downsampling))
indices = np.where(np.random.uniform(size=nqso)<args.downsampling)[0]
if indices.size == 0 :
log.warning("Down sampling from {} to 0 (by chance I presume)".format(nqso))
return
transmission = transmission[indices]
metadata = metadata[:][indices]
DZ_FOG = DZ_FOG[indices]
nqso = transmission.shape[0]
if args.nmax is not None :
if args.nmax < nqso :
log.info("Limit number of QSOs from {} to nmax={} (random subsample)".format(nqso,args.nmax))
# take a random subsample
indices = np.random.choice(np.arange(nqso),args.nmax,replace=False) ##Use random.choice instead of random.uniform (rarely but it does cause a duplication of qsos)
transmission = transmission[indices]
metadata = metadata[:][indices]
DZ_FOG = DZ_FOG[indices]
nqso = args.nmax
# In previous versions of the London mocks we needed to enforce F=1 for
# z > z_qso here, but this is not needed anymore. Moreover, now we also
# have metal absorption that implies F < 1 for z > z_qso
#for ii in range(len(metadata)):
# transmission[ii][trans_wave>lambda_RF_LYA*(metadata[ii]['Z']+1)]=1.0
# if requested, add DLA to the transmission skewers
if args.dla is not None :
# if adding random DLAs, we will need a new random generator
if args.dla=='random':
log.info('Adding DLAs randomly')
random_state_just_for_dlas = np.random.RandomState(seed)
elif args.dla=='file':
log.info('Adding DLAs from transmission file')
else:
log.error("Wrong option for args.dla: "+args.dla)
sys.exit(1)
# if adding DLAs, the information will be printed here
dla_filename=os.path.join(pixdir,"dla-{}-{}.fits".format(nside,pixel))
dla_NHI, dla_z, dla_qid,dla_id = [], [], [],[]
# identify minimum Lya redshift in transmission files
min_lya_z = np.min(trans_wave/lambda_RF_LYA - 1)
# loop over quasars in pixel
for ii in range(len(metadata)):
# quasars with z < min_z will not have any DLA in spectrum
if min_lya_z>metadata['Z'][ii]: continue
# quasar ID
idd=metadata['MOCKID'][ii]
dlas=[]
if args.dla=='file':
for dla in dla_info[dla_info['MOCKID']==idd]:
# Adding only DLAs with z < zqso
if dla['Z_DLA_RSD']>=metadata['Z'][ii]: continue
dlas.append(dict(z=dla['Z_DLA_RSD'],N=dla['N_HI_DLA'],dlaid=dla['DLAID']))
transmission_dla = dla_spec(trans_wave,dlas)
elif args.dla=='random':
dlas, transmission_dla = insert_dlas(trans_wave, metadata['Z'][ii], rstate=random_state_just_for_dlas)
for idla in dlas:
idla['dlaid']+=idd*1000 #Added to have unique DLA ids. Same format as DLAs from file.
# multiply transmissions and store information for the DLA file
if len(dlas)>0:
transmission[ii] = transmission_dla * transmission[ii]
dla_z += [idla['z'] for idla in dlas]
dla_NHI += [idla['N'] for idla in dlas]
dla_id += [idla['dlaid'] for idla in dlas]
dla_qid += [idd]*len(dlas)
log.info('Added {} DLAs'.format(len(dla_id)))
# write file with DLA information
if len(dla_id)>0:
dla_meta=Table()
dla_meta['NHI'] = dla_NHI
dla_meta['Z_DLA'] = dla_z #This is Z_DLA_RSD in transmision.
dla_meta['TARGETID']=dla_qid
dla_meta['DLAID'] = dla_id
hdu_dla = pyfits.convenience.table_to_hdu(dla_meta)
hdu_dla.name="DLA_META"
del(dla_meta)
log.info("DLA metadata to be saved in {}".format(truth_filename))
else:
hdu_dla=pyfits.PrimaryHDU()
hdu_dla.name="DLA_META"
# if requested, extend transmission skewers to cover full spectrum
if args.target_selection or args.bbflux :
wanted_min_wave = 3329. # needed to compute magnitudes for decam2014-r (one could have trimmed the transmission file ...)
wanted_max_wave = 55501. # needed to compute magnitudes for wise2010-W2
if trans_wave[0]>wanted_min_wave :
log.info("Increase wavelength range from {}:{} to {}:{} to compute magnitudes".format(int(trans_wave[0]),int(trans_wave[-1]),int(wanted_min_wave),int(trans_wave[-1])))
# pad with ones at short wavelength, we assume F = 1 for z <~ 1.7
# we don't need any wavelength resolution here
new_trans_wave = np.append([wanted_min_wave,trans_wave[0]-0.01],trans_wave)
new_transmission = np.ones((transmission.shape[0],new_trans_wave.size))
new_transmission[:,2:] = transmission
trans_wave = new_trans_wave
transmission = new_transmission
if trans_wave[-1]<wanted_max_wave :
log.info("Increase wavelength range from {}:{} to {}:{} to compute magnitudes".format(int(trans_wave[0]),int(trans_wave[-1]),int(trans_wave[0]),int(wanted_max_wave)))
# pad with ones at long wavelength because we assume F = 1
coarse_dwave = 2. # we don't care about resolution, we just need a decent QSO spectrum, there is no IGM transmission in this range
n = int((wanted_max_wave-trans_wave[-1])/coarse_dwave)+1
new_trans_wave = np.append(trans_wave,np.linspace(trans_wave[-1]+coarse_dwave,trans_wave[-1]+coarse_dwave*(n+1),n))
new_transmission = np.ones((transmission.shape[0],new_trans_wave.size))
new_transmission[:,:trans_wave.size] = transmission
trans_wave = new_trans_wave
transmission = new_transmission
# whether to use QSO or SIMQSO to generate quasar continua. Simulate
# spectra in the north vs south separately because they're on different
# photometric systems.
south = np.where( is_south(metadata['DEC']) )[0]
north = np.where( ~is_south(metadata['DEC']) )[0]
meta, qsometa = empty_metatable(nqso, objtype='QSO', simqso=not args.no_simqso)
if args.no_simqso:
log.info("Simulate {} QSOs with QSO templates".format(nqso))
tmp_qso_flux = np.zeros([nqso, len(model.eigenwave)], dtype='f4')
tmp_qso_wave = np.zeros_like(tmp_qso_flux)
else:
log.info("Simulate {} QSOs with SIMQSO templates".format(nqso))
tmp_qso_flux = np.zeros([nqso, len(model.basewave)], dtype='f4')
tmp_qso_wave = model.basewave
for these, issouth in zip( (north, south), (False, True) ):
# number of quasars in these
nt = len(these)
if nt<=0: continue
if not eboss is None:
# for eBOSS, generate only quasars with r<22
magrange = (17.0, 21.3)
_tmp_qso_flux, _tmp_qso_wave, _meta, _qsometa \
= model.make_templates(nmodel=nt,
redshift=metadata['Z'][these], magrange=magrange,
lyaforest=False, nocolorcuts=True,
noresample=True, seed=seed, south=issouth)
else:
_tmp_qso_flux, _tmp_qso_wave, _meta, _qsometa \
= model.make_templates(nmodel=nt,
redshift=metadata['Z'][these],
lyaforest=False, nocolorcuts=True,
noresample=True, seed=seed, south=issouth)
_meta['TARGETID'] = metadata['MOCKID'][these]
_qsometa['TARGETID'] = metadata['MOCKID'][these]
meta[these] = _meta
qsometa[these] = _qsometa
tmp_qso_flux[these, :] = _tmp_qso_flux
if args.no_simqso:
tmp_qso_wave[these, :] = _tmp_qso_wave
log.info("Resample to transmission wavelength grid")
qso_flux=np.zeros((tmp_qso_flux.shape[0],trans_wave.size))
if args.no_simqso:
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=np.interp(trans_wave,tmp_qso_wave[q],tmp_qso_flux[q])
else:
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=np.interp(trans_wave,tmp_qso_wave,tmp_qso_flux[q])
tmp_qso_flux = qso_flux
tmp_qso_wave = trans_wave
# if requested, add BAL features to the quasar continua
if args.balprob:
if args.balprob<=1. and args.balprob >0:
log.info("Adding BALs with probability {}".format(args.balprob))
# save current random state
rnd_state = np.random.get_state()
tmp_qso_flux,meta_bal=bal.insert_bals(tmp_qso_wave,tmp_qso_flux, metadata['Z'],
balprob=args.balprob,seed=seed)
# restore random state to get the same random numbers later
# as when we don't insert BALs
np.random.set_state(rnd_state)
meta_bal['TARGETID'] = metadata['MOCKID']
w = meta_bal['TEMPLATEID']!=-1
meta_bal = meta_bal[:][w]
hdu_bal=pyfits.convenience.table_to_hdu(meta_bal); hdu_bal.name="BAL_META"
del meta_bal
else:
balstr=str(args.balprob)
log.error("BAL probability is not between 0 and 1 : "+balstr)
sys.exit(1)
# Multiply quasar continua by transmitted flux fraction
# (at this point transmission file might include Ly-beta, metals and DLAs)
log.info("Apply transmitted flux fraction")
if not args.no_transmission:
tmp_qso_flux = apply_lya_transmission(tmp_qso_wave,tmp_qso_flux,
trans_wave,transmission)
# if requested, compute metal transmission on the fly
# (if not included already from the transmission file)
if args.metals is not None:
if args.metals_from_file :
log.error('you cannot add metals twice')
raise ValueError('you cannot add metals twice')
if args.no_transmission:
log.error('you cannot add metals if asking for no-transmission')
raise ValueError('can not add metals if using no-transmission')
lstMetals = ''
for m in args.metals: lstMetals += m+', '
log.info("Apply metals: {}".format(lstMetals[:-2]))
tmp_qso_flux = apply_metals_transmission(tmp_qso_wave,tmp_qso_flux,
trans_wave,transmission,args.metals)
# if requested, compute magnitudes and apply target selection. Need to do
# this calculation separately for QSOs in the north vs south.
bbflux=None
if args.target_selection or args.bbflux :
bands=['FLUX_G','FLUX_R','FLUX_Z', 'FLUX_W1', 'FLUX_W2']
bbflux=dict()
bbflux['SOUTH'] = is_south(metadata['DEC'])
for band in bands:
bbflux[band] = np.zeros(nqso)
# need to recompute the magnitudes to account for lya transmission
log.info("Compute QSO magnitudes")
for these, filters in zip( (~bbflux['SOUTH'], bbflux['SOUTH']),
(bassmzls_and_wise_filters, decam_and_wise_filters) ):
if np.count_nonzero(these) > 0:
maggies = filters.get_ab_maggies(1e-17 * tmp_qso_flux[these, :], tmp_qso_wave)
for band, filt in zip( bands, maggies.colnames ):
bbflux[band][these] = np.ma.getdata(1e9 * maggies[filt]) # nanomaggies
if args.target_selection :
log.info("Apply target selection")
isqso = np.ones(nqso, dtype=bool)
for these, issouth in zip( (~bbflux['SOUTH'], bbflux['SOUTH']), (False, True) ):
if np.count_nonzero(these) > 0:
# optical cuts only if using QSO vs SIMQSO
isqso[these] &= isQSO_colors(gflux=bbflux['FLUX_G'][these],
rflux=bbflux['FLUX_R'][these],
zflux=bbflux['FLUX_Z'][these],
w1flux=bbflux['FLUX_W1'][these],
w2flux=bbflux['FLUX_W2'][these],
south=issouth, optical=args.no_simqso)
log.info("Target selection: {}/{} QSOs selected".format(np.sum(isqso),nqso))
selection=np.where(isqso)[0]
if selection.size==0 : return
tmp_qso_flux = tmp_qso_flux[selection]
metadata = metadata[:][selection]
meta = meta[:][selection]
qsometa = qsometa[:][selection]
DZ_FOG = DZ_FOG[selection]
for band in bands :
bbflux[band] = bbflux[band][selection]
bbflux['SOUTH']=bbflux['SOUTH'][selection]
nqso = selection.size
log.info("Resample to a linear wavelength grid (needed by DESI sim.)")
# careful integration of bins, not just a simple interpolation
qso_wave=np.linspace(args.wmin,args.wmax,int((args.wmax-args.wmin)/args.dwave)+1)
qso_flux=np.zeros((tmp_qso_flux.shape[0],qso_wave.size))
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=resample_flux(qso_wave,tmp_qso_wave,tmp_qso_flux[q])
log.info("Simulate DESI observation and write output file")
if "MOCKID" in metadata.dtype.names :
#log.warning("Using MOCKID as TARGETID")
targetid=np.array(metadata["MOCKID"]).astype(int)
elif "ID" in metadata.dtype.names :
log.warning("Using ID as TARGETID")
targetid=np.array(metadata["ID"]).astype(int)
else :
log.warning("No TARGETID")
targetid=None
specmeta={"HPXNSIDE":nside,"HPXPIXEL":pixel, "HPXNEST":hpxnest}
if args.target_selection or args.bbflux :
fibermap_columns = dict(
FLUX_G = bbflux['FLUX_G'],
FLUX_R = bbflux['FLUX_R'],
FLUX_Z = bbflux['FLUX_Z'],
FLUX_W1 = bbflux['FLUX_W1'],
FLUX_W2 = bbflux['FLUX_W2'],
)
photsys = np.full(len(bbflux['FLUX_G']), 'N', dtype='S1')
photsys[bbflux['SOUTH']] = b'S'
fibermap_columns['PHOTSYS'] = photsys
else :
fibermap_columns=None
# Attenuate the spectra for extinction
if not sfdmap is None:
Rv=3.1 #set by default
indx=np.arange(metadata['RA'].size)
extinction =Rv*ext_odonnell(qso_wave)
EBV = sfdmap.ebv(metadata['RA'],metadata['DEC'], scaling=1.0)
qso_flux *=10**( -0.4 * EBV[indx, np.newaxis] * extinction)
if fibermap_columns is not None:
fibermap_columns['EBV']=EBV
EBV0=0.0
EBV_med=np.median(EBV)
Ag = 3.303 * (EBV_med - EBV0)
exptime_fact=np.power(10.0, (2.0 * Ag / 2.5))
obsconditions['EXPTIME']*=exptime_fact
log.info("Dust extinction added")
log.info('exposure time adjusted to {}'.format(obsconditions['EXPTIME']))
sim_spectra(qso_wave,qso_flux, args.program, obsconditions=obsconditions,spectra_filename=ofilename,
sourcetype="qso", skyerr=args.skyerr,ra=metadata["RA"],dec=metadata["DEC"],targetid=targetid,
meta=specmeta,seed=seed,fibermap_columns=fibermap_columns,use_poisson=False) # use Poisson = False to get reproducible results.
### Keep input redshift
Z_spec = metadata['Z'].copy()
Z_input = metadata['Z'].copy()-DZ_FOG
### Add a shift to the redshift, simulating the systematic imprecision of redrock
DZ_sys_shift = args.shift_kms_los/c*(1.+Z_input)
log.info('Added a shift of {} km/s to the redshift'.format(args.shift_kms_los))
meta['REDSHIFT'] += DZ_sys_shift
metadata['Z'] += DZ_sys_shift
### Add a shift to the redshift, simulating the statistic imprecision of redrock
if args.gamma_kms_zfit:
log.info("Added zfit error with gamma {} to zbest".format(args.gamma_kms_zfit))
DZ_stat_shift = mod_cauchy(loc=0,scale=args.gamma_kms_zfit,size=nqso,cut=3000)/c*(1.+Z_input)
meta['REDSHIFT'] += DZ_stat_shift
metadata['Z'] += DZ_stat_shift
## Write the truth file, including metadata for DLAs and BALs
log.info('Writing a truth file {}'.format(truth_filename))
meta.rename_column('REDSHIFT','Z')
meta.add_column(Column(Z_spec,name='TRUEZ'))
meta.add_column(Column(Z_input,name='Z_INPUT'))
meta.add_column(Column(DZ_FOG,name='DZ_FOG'))
meta.add_column(Column(DZ_sys_shift,name='DZ_SYS'))
if args.gamma_kms_zfit:
meta.add_column(Column(DZ_stat_shift,name='DZ_STAT'))
if 'Z_noRSD' in metadata.dtype.names:
meta.add_column(Column(metadata['Z_noRSD'],name='Z_NORSD'))
else:
log.info('Z_noRSD field not present in transmission file. Z_NORSD not saved to truth file')
#Save global seed and pixel seed to primary header
hdr=pyfits.Header()
hdr['GSEED']=global_seed
hdr['PIXSEED']=seed
hdu = pyfits.convenience.table_to_hdu(meta)
hdu.header['EXTNAME'] = 'TRUTH'
hduqso=pyfits.convenience.table_to_hdu(qsometa)
hduqso.header['EXTNAME'] = 'QSO_META'
hdulist=pyfits.HDUList([pyfits.PrimaryHDU(header=hdr),hdu,hduqso])
if args.dla:
hdulist.append(hdu_dla)
if args.balprob:
hdulist.append(hdu_bal)
hdulist.writeto(truth_filename, overwrite=True)
hdulist.close()
if args.zbest :
log.info("Read fibermap")
fibermap = read_fibermap(ofilename)
log.info("Writing a zbest file {}".format(zbest_filename))
columns = [
('CHI2', 'f8'),
('COEFF', 'f8' , (4,)),
('Z', 'f8'),
('ZERR', 'f8'),
('ZWARN', 'i8'),
('SPECTYPE', (str,96)),
('SUBTYPE', (str,16)),
('TARGETID', 'i8'),
('DELTACHI2', 'f8'),
('BRICKNAME', (str,8))]
zbest = Table(np.zeros(nqso, dtype=columns))
zbest['CHI2'][:] = 0.
zbest['Z'][:] = metadata['Z']
zbest['ZERR'][:] = 0.
zbest['ZWARN'][:] = 0
zbest['SPECTYPE'][:] = 'QSO'
zbest['SUBTYPE'][:] = ''
zbest['TARGETID'][:] = metadata['MOCKID']
zbest['DELTACHI2'][:] = 25.
hzbest = pyfits.convenience.table_to_hdu(zbest); hzbest.name='ZBEST'
hfmap = pyfits.convenience.table_to_hdu(fibermap); hfmap.name='FIBERMAP'
hdulist =pyfits.HDUList([pyfits.PrimaryHDU(),hzbest,hfmap])
hdulist.writeto(zbest_filename, overwrite=True)
hdulist.close() # see if this helps with memory issue
def simulate_one_healpix(ifilename,args,model,obsconditions,decam_and_wise_filters,
bassmzls_and_wise_filters,footprint_healpix_weight,
footprint_healpix_nside,
bal=None,sfdmap=None,eboss=None) :
log = get_logger()
# open filename and extract basic HEALPix information
pixel, nside, hpxnest = get_healpix_info(ifilename)
# using global seed (could be None) get seed for this particular pixel
global_seed = args.seed
seed = get_pixel_seed(pixel, nside, global_seed)
# use this seed to generate future random numbers
np.random.seed(seed)
# get output file (we will write there spectra for this HEALPix pixel)
ofilename = get_spectra_filename(args,nside,pixel)
# get directory name (we will also write there zbest file)
pixdir = os.path.dirname(ofilename)
# get filename for truth file
truth_filename = get_truth_filename(args,pixdir,nside,pixel)
# get filename for zbest file
zbest_filename = get_zbest_filename(args,pixdir,nside,pixel)
if not args.overwrite :
# check whether output exists or not
if args.zbest :
if os.path.isfile(ofilename) and os.path.isfile(zbest_filename) :
log.info("skip existing {} and {}".format(ofilename,zbest_filename))
return
else : # only test spectra file
if os.path.isfile(ofilename) :
log.info("skip existing {}".format(ofilename))
return
# create sub-directories if required
if len(pixdir)>0 :
if not os.path.isdir(pixdir) :
log.info("Creating dir {}".format(pixdir))
os.makedirs(pixdir)
log.info("Read skewers in {}, random seed = {}".format(ifilename,seed))
# Read transmission from files. It might include DLA information, and it
# might add metal transmission as well (from the HDU file).
log.info("Read transmission file {}".format(ifilename))
trans_wave, transmission, metadata, dla_info = read_lya_skewers(ifilename,read_dlas=(args.dla=='file'),add_metals=args.metals_from_file)
### Add Finger-of-God, before generate the continua
log.info("Add FOG to redshift with sigma {} to quasar redshift".format(args.sigma_kms_fog))
DZ_FOG = args.sigma_kms_fog/c*(1.+metadata['Z'])*np.random.normal(0,1,metadata['Z'].size)
metadata['Z'] += DZ_FOG
### Select quasar within a given redshift range
w = (metadata['Z']>=args.zmin) & (metadata['Z']<=args.zmax)
transmission = transmission[w]
metadata = metadata[:][w]
DZ_FOG = DZ_FOG[w]
# option to make for BOSS+eBOSS
if not eboss is None:
if args.downsampling or args.desi_footprint:
raise ValueError("eboss option can not be run with "
+"desi_footprint or downsampling")
# Get the redshift distribution from SDSS
selection = sdss_subsample_redshift(metadata["RA"],metadata["DEC"],metadata['Z'],eboss['redshift'])
log.info("Select QSOs in BOSS+eBOSS redshift distribution {} -> {}".format(metadata['Z'].size,selection.sum()))
if selection.sum()==0:
log.warning("No intersection with BOSS+eBOSS redshift distribution")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
# figure out the density of all quasars
N_highz = metadata['Z'].size
# area of healpix pixel, in degrees
area_deg2 = healpy.pixelfunc.nside2pixarea(nside,degrees=True)
input_highz_dens_deg2 = N_highz/area_deg2
selection = sdss_subsample(metadata["RA"], metadata["DEC"],
input_highz_dens_deg2,eboss['footprint'])
log.info("Select QSOs in BOSS+eBOSS footprint {} -> {}".format(transmission.shape[0],selection.size))
if selection.size == 0 :
log.warning("No intersection with BOSS+eBOSS footprint")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
if args.desi_footprint :
footprint_healpix = footprint.radec2pix(footprint_healpix_nside, metadata["RA"], metadata["DEC"])
selection = np.where(footprint_healpix_weight[footprint_healpix]>0.99)[0]
log.info("Select QSOs in DESI footprint {} -> {}".format(transmission.shape[0],selection.size))
if selection.size == 0 :
log.warning("No intersection with DESI footprint")
return
transmission = transmission[selection]
metadata = metadata[:][selection]
DZ_FOG = DZ_FOG[selection]
nqso=transmission.shape[0]
if args.downsampling is not None :
if args.downsampling <= 0 or args.downsampling > 1 :
log.error("Down sampling fraction={} must be between 0 and 1".format(args.downsampling))
raise ValueError("Down sampling fraction={} must be between 0 and 1".format(args.downsampling))
indices = np.where(np.random.uniform(size=nqso)<args.downsampling)[0]
if indices.size == 0 :
log.warning("Down sampling from {} to 0 (by chance I presume)".format(nqso))
return
transmission = transmission[indices]
metadata = metadata[:][indices]
DZ_FOG = DZ_FOG[indices]
nqso = transmission.shape[0]
if args.nmax is not None :
if args.nmax < nqso :
log.info("Limit number of QSOs from {} to nmax={} (random subsample)".format(nqso,args.nmax))
# take a random subsample
indices = (np.random.uniform(size=args.nmax)*nqso).astype(int)
transmission = transmission[indices]
metadata = metadata[:][indices]
DZ_FOG = DZ_FOG[indices]
nqso = args.nmax
# In previous versions of the London mocks we needed to enforce F=1 for
# z > z_qso here, but this is not needed anymore. Moreover, now we also
# have metal absorption that implies F < 1 for z > z_qso
#for ii in range(len(metadata)):
# transmission[ii][trans_wave>lambda_RF_LYA*(metadata[ii]['Z']+1)]=1.0
# if requested, add DLA to the transmission skewers
if args.dla is not None :
# if adding random DLAs, we will need a new random generator
if args.dla=='random':
log.info('Adding DLAs randomly')
random_state_just_for_dlas = np.random.RandomState(seed)
elif args.dla=='file':
log.info('Adding DLAs from transmission file')
else:
log.error("Wrong option for args.dla: "+args.dla)
sys.exit(1)
# if adding DLAs, the information will be printed here
dla_filename=os.path.join(pixdir,"dla-{}-{}.fits".format(nside,pixel))
dla_NHI, dla_z, dla_qid,dla_id = [], [], [],[]
# identify minimum Lya redshift in transmission files
min_lya_z = np.min(trans_wave/lambda_RF_LYA - 1)
# loop over quasars in pixel
for ii in range(len(metadata)):
# quasars with z < min_z will not have any DLA in spectrum
if min_lya_z>metadata['Z'][ii]: continue
# quasar ID
idd=metadata['MOCKID'][ii]
dlas=[]
if args.dla=='file':
for dla in dla_info[dla_info['MOCKID']==idd]:
# Adding only DLAs with z < zqso
if dla['Z_DLA_RSD']>=metadata['Z'][ii]: continue
dlas.append(dict(z=dla['Z_DLA_RSD'],N=dla['N_HI_DLA'],dlaid=dla['DLAID']))
transmission_dla = dla_spec(trans_wave,dlas)
elif args.dla=='random':
dlas, transmission_dla = insert_dlas(trans_wave, metadata['Z'][ii], rstate=random_state_just_for_dlas)
for idla in dlas:
idla['dlaid']+=idd*1000 #Added to have unique DLA ids. Same format as DLAs from file.
# multiply transmissions and store information for the DLA file
if len(dlas)>0:
transmission[ii] = transmission_dla * transmission[ii]
dla_z += [idla['z'] for idla in dlas]
dla_NHI += [idla['N'] for idla in dlas]
dla_id += [idla['dlaid'] for idla in dlas]
dla_qid += [idd]*len(dlas)
log.info('Added {} DLAs'.format(len(dla_id)))
# write file with DLA information
if len(dla_id)>0:
dla_meta=Table()
dla_meta['NHI'] = dla_NHI
dla_meta['Z_DLA'] = dla_z #This is Z_DLA_RSD in transmision.
dla_meta['TARGETID']=dla_qid
dla_meta['DLAID'] = dla_id
hdu_dla = pyfits.convenience.table_to_hdu(dla_meta)
hdu_dla.name="DLA_META"
del(dla_meta)
log.info("DLA metadata to be saved in {}".format(truth_filename))
else:
hdu_dla=pyfits.PrimaryHDU()
hdu_dla.name="DLA_META"
# if requested, extend transmission skewers to cover full spectrum
if args.target_selection or args.bbflux :
wanted_min_wave = 3329. # needed to compute magnitudes for decam2014-r (one could have trimmed the transmission file ...)
wanted_max_wave = 55501. # needed to compute magnitudes for wise2010-W2
if trans_wave[0]>wanted_min_wave :
log.info("Increase wavelength range from {}:{} to {}:{} to compute magnitudes".format(int(trans_wave[0]),int(trans_wave[-1]),int(wanted_min_wave),int(trans_wave[-1])))
# pad with ones at short wavelength, we assume F = 1 for z <~ 1.7
# we don't need any wavelength resolution here
new_trans_wave = np.append([wanted_min_wave,trans_wave[0]-0.01],trans_wave)
new_transmission = np.ones((transmission.shape[0],new_trans_wave.size))
new_transmission[:,2:] = transmission
trans_wave = new_trans_wave
transmission = new_transmission
if trans_wave[-1]<wanted_max_wave :
log.info("Increase wavelength range from {}:{} to {}:{} to compute magnitudes".format(int(trans_wave[0]),int(trans_wave[-1]),int(trans_wave[0]),int(wanted_max_wave)))
# pad with ones at long wavelength because we assume F = 1
coarse_dwave = 2. # we don't care about resolution, we just need a decent QSO spectrum, there is no IGM transmission in this range
n = int((wanted_max_wave-trans_wave[-1])/coarse_dwave)+1
new_trans_wave = np.append(trans_wave,np.linspace(trans_wave[-1]+coarse_dwave,trans_wave[-1]+coarse_dwave*(n+1),n))
new_transmission = np.ones((transmission.shape[0],new_trans_wave.size))
new_transmission[:,:trans_wave.size] = transmission
trans_wave = new_trans_wave
transmission = new_transmission
# whether to use QSO or SIMQSO to generate quasar continua. Simulate
# spectra in the north vs south separately because they're on different
# photometric systems.
south = np.where( is_south(metadata['DEC']) )[0]
north = np.where( ~is_south(metadata['DEC']) )[0]
meta, qsometa = empty_metatable(nqso, objtype='QSO', simqso=not args.no_simqso)
if args.no_simqso:
log.info("Simulate {} QSOs with QSO templates".format(nqso))
tmp_qso_flux = np.zeros([nqso, len(model.eigenwave)], dtype='f4')
tmp_qso_wave = np.zeros_like(tmp_qso_flux)
else:
log.info("Simulate {} QSOs with SIMQSO templates".format(nqso))
tmp_qso_flux = np.zeros([nqso, len(model.basewave)], dtype='f4')
tmp_qso_wave = model.basewave
for these, issouth in zip( (north, south), (False, True) ):
# number of quasars in these
nt = len(these)
if nt<=0: continue
if not eboss is None:
# for eBOSS, generate only quasars with r<22
magrange = (17.0, 21.3)
_tmp_qso_flux, _tmp_qso_wave, _meta, _qsometa \
= model.make_templates(nmodel=nt,
redshift=metadata['Z'][these], magrange=magrange,
lyaforest=False, nocolorcuts=True,
noresample=True, seed=seed, south=issouth)
else:
_tmp_qso_flux, _tmp_qso_wave, _meta, _qsometa \
= model.make_templates(nmodel=nt,
redshift=metadata['Z'][these],
lyaforest=False, nocolorcuts=True,
noresample=True, seed=seed, south=issouth)
_meta['TARGETID'] = metadata['MOCKID'][these]
_qsometa['TARGETID'] = metadata['MOCKID'][these]
meta[these] = _meta
qsometa[these] = _qsometa
tmp_qso_flux[these, :] = _tmp_qso_flux
if args.no_simqso:
tmp_qso_wave[these, :] = _tmp_qso_wave
log.info("Resample to transmission wavelength grid")
qso_flux=np.zeros((tmp_qso_flux.shape[0],trans_wave.size))
if args.no_simqso:
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=np.interp(trans_wave,tmp_qso_wave[q],tmp_qso_flux[q])
else:
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=np.interp(trans_wave,tmp_qso_wave,tmp_qso_flux[q])
tmp_qso_flux = qso_flux
tmp_qso_wave = trans_wave
# if requested, add BAL features to the quasar continua
if args.balprob:
if args.balprob<=1. and args.balprob >0:
log.info("Adding BALs with probability {}".format(args.balprob))
# save current random state
rnd_state = np.random.get_state()
tmp_qso_flux,meta_bal=bal.insert_bals(tmp_qso_wave,tmp_qso_flux, metadata['Z'],
balprob=args.balprob,seed=seed)
# restore random state to get the same random numbers later
# as when we don't insert BALs
np.random.set_state(rnd_state)
meta_bal['TARGETID'] = metadata['MOCKID']
w = meta_bal['TEMPLATEID']!=-1
meta_bal = meta_bal[:][w]
hdu_bal=pyfits.convenience.table_to_hdu(meta_bal); hdu_bal.name="BAL_META"
del meta_bal
else:
balstr=str(args.balprob)
log.error("BAL probability is not between 0 and 1 : "+balstr)
sys.exit(1)
# Multiply quasar continua by transmitted flux fraction
# (at this point transmission file might include Ly-beta, metals and DLAs)
log.info("Apply transmitted flux fraction")
if not args.no_transmission:
tmp_qso_flux = apply_lya_transmission(tmp_qso_wave,tmp_qso_flux,
trans_wave,transmission)
# if requested, compute metal transmission on the fly
# (if not included already from the transmission file)
if args.metals is not None:
if args.metals_from_file:
log.error('you cannot add metals twice')
raise ValueError('you cannot add metals twice')
if args.no_transmission:
log.error('you cannot add metals if asking for no-transmission')
raise ValueError('can not add metals if using no-transmission')
lstMetals = ''
for m in args.metals: lstMetals += m+', '
log.info("Apply metals: {}".format(lstMetals[:-2]))
tmp_qso_flux = apply_metals_transmission(tmp_qso_wave,tmp_qso_flux,
trans_wave,transmission,args.metals)
# if requested, compute magnitudes and apply target selection. Need to do
# this calculation separately for QSOs in the north vs south.
bbflux=None
if args.target_selection or args.bbflux :
bands=['FLUX_G','FLUX_R','FLUX_Z', 'FLUX_W1', 'FLUX_W2']
bbflux=dict()
bbflux['SOUTH'] = is_south(metadata['DEC'])
for band in bands:
bbflux[band] = np.zeros(nqso)
# need to recompute the magnitudes to account for lya transmission
log.info("Compute QSO magnitudes")
for these, filters in zip( (~bbflux['SOUTH'], bbflux['SOUTH']),
(bassmzls_and_wise_filters, decam_and_wise_filters) ):
if np.count_nonzero(these) > 0:
maggies = filters.get_ab_maggies(1e-17 * tmp_qso_flux[these, :], tmp_qso_wave)
for band, filt in zip( bands, maggies.colnames ):
bbflux[band][these] = np.ma.getdata(1e9 * maggies[filt]) # nanomaggies
if args.target_selection :
log.info("Apply target selection")
isqso = np.ones(nqso, dtype=bool)
for these, issouth in zip( (~bbflux['SOUTH'], bbflux['SOUTH']), (False, True) ):
if np.count_nonzero(these) > 0:
# optical cuts only if using QSO vs SIMQSO
isqso[these] &= isQSO_colors(gflux=bbflux['FLUX_G'][these],
rflux=bbflux['FLUX_R'][these],
zflux=bbflux['FLUX_Z'][these],
w1flux=bbflux['FLUX_W1'][these],
w2flux=bbflux['FLUX_W2'][these],
south=issouth, optical=args.no_simqso)
log.info("Target selection: {}/{} QSOs selected".format(np.sum(isqso),nqso))
selection=np.where(isqso)[0]
if selection.size==0 : return
tmp_qso_flux = tmp_qso_flux[selection]
metadata = metadata[:][selection]
meta = meta[:][selection]
qsometa = qsometa[:][selection]
DZ_FOG = DZ_FOG[selection]
for band in bands :
bbflux[band] = bbflux[band][selection]
nqso = selection.size
log.info("Resample to a linear wavelength grid (needed by DESI sim.)")
# careful integration of bins, not just a simple interpolation
qso_wave=np.linspace(args.wmin,args.wmax,int((args.wmax-args.wmin)/args.dwave)+1)
qso_flux=np.zeros((tmp_qso_flux.shape[0],qso_wave.size))
for q in range(tmp_qso_flux.shape[0]) :
qso_flux[q]=resample_flux(qso_wave,tmp_qso_wave,tmp_qso_flux[q])
log.info("Simulate DESI observation and write output file")
if "MOCKID" in metadata.dtype.names :
#log.warning("Using MOCKID as TARGETID")
targetid=np.array(metadata["MOCKID"]).astype(int)
elif "ID" in metadata.dtype.names :
log.warning("Using ID as TARGETID")
targetid=np.array(metadata["ID"]).astype(int)
else :
log.warning("No TARGETID")
targetid=None
specmeta={"HPXNSIDE":nside,"HPXPIXEL":pixel, "HPXNEST":hpxnest}
if args.target_selection or args.bbflux :
fibermap_columns = dict(
FLUX_G = bbflux['FLUX_G'],
FLUX_R = bbflux['FLUX_R'],
FLUX_Z = bbflux['FLUX_Z'],
FLUX_W1 = bbflux['FLUX_W1'],
FLUX_W2 = bbflux['FLUX_W2'],
)
photsys = np.full(len(bbflux['FLUX_G']), 'N', dtype='S1')
photsys[bbflux['SOUTH']] = b'S'
fibermap_columns['PHOTSYS'] = photsys
else :
fibermap_columns=None
# Attenuate the spectra for extinction
if not sfdmap is None:
Rv=3.1 #set by default
indx=np.arange(metadata['RA'].size)
extinction =Rv*ext_odonnell(qso_wave)
EBV = sfdmap.ebv(metadata['RA'],metadata['DEC'], scaling=1.0)
qso_flux *=10**( -0.4 * EBV[indx, np.newaxis] * extinction)
if fibermap_columns is not None:
fibermap_columns['EBV']=EBV
EBV0=0.0
EBV_med=np.median(EBV)
Ag = 3.303 * (EBV_med - EBV0)
exptime_fact=np.power(10.0, (2.0 * Ag / 2.5))
obsconditions['EXPTIME']*=exptime_fact
log.info("Dust extinction added")
log.info('exposure time adjusted to {}'.format(obsconditions['EXPTIME']))
sim_spectra(qso_wave,qso_flux, args.program, obsconditions=obsconditions,spectra_filename=ofilename,
sourcetype="qso", skyerr=args.skyerr,ra=metadata["RA"],dec=metadata["DEC"],targetid=targetid,
meta=specmeta,seed=seed,fibermap_columns=fibermap_columns,use_poisson=False) # use Poisson = False to get reproducible results.
### Keep input redshift
Z_spec = metadata['Z'].copy()
Z_input = metadata['Z'].copy()-DZ_FOG
### Add a shift to the redshift, simulating the systematic imprecision of redrock
DZ_sys_shift = args.shift_kms_los/c*(1.+Z_input)
log.info('Added a shift of {} km/s to the redshift'.format(args.shift_kms_los))
meta['REDSHIFT'] += DZ_sys_shift
metadata['Z'] += DZ_sys_shift
### Add a shift to the redshift, simulating the statistic imprecision of redrock
if args.gamma_kms_zfit:
log.info("Added zfit error with gamma {} to zbest".format(args.gamma_kms_zfit))
DZ_stat_shift = mod_cauchy(loc=0,scale=args.gamma_kms_zfit,size=nqso,cut=3000)/c*(1.+Z_input)
meta['REDSHIFT'] += DZ_stat_shift
metadata['Z'] += DZ_stat_shift
## Write the truth file, including metadata for DLAs and BALs
log.info('Writing a truth file {}'.format(truth_filename))
meta.rename_column('REDSHIFT','Z')
meta.add_column(Column(Z_spec,name='TRUEZ'))
meta.add_column(Column(Z_input,name='Z_INPUT'))
meta.add_column(Column(DZ_FOG,name='DZ_FOG'))
meta.add_column(Column(DZ_sys_shift,name='DZ_SYS'))
if args.gamma_kms_zfit:
meta.add_column(Column(DZ_stat_shift,name='DZ_STAT'))
if 'Z_noRSD' in metadata.dtype.names:
meta.add_column(Column(metadata['Z_noRSD'],name='Z_NORSD'))
else:
log.info('Z_noRSD field not present in transmission file. Z_NORSD not saved to truth file')
hdu = pyfits.convenience.table_to_hdu(meta)
hdu.header['EXTNAME'] = 'TRUTH'
hduqso=pyfits.convenience.table_to_hdu(qsometa)
hduqso.header['EXTNAME'] = 'QSO_META'
hdulist=pyfits.HDUList([pyfits.PrimaryHDU(),hdu,hduqso])
if args.dla:
hdulist.append(hdu_dla)
if args.balprob:
hdulist.append(hdu_bal)
hdulist.writeto(truth_filename, overwrite=True)
hdulist.close()
if args.zbest :
log.info("Read fibermap")
fibermap = read_fibermap(ofilename)
log.info("Writing a zbest file {}".format(zbest_filename))
columns = [
('CHI2', 'f8'),
('COEFF', 'f8' , (4,)),
('Z', 'f8'),
('ZERR', 'f8'),
('ZWARN', 'i8'),
('SPECTYPE', (str,96)),
('SUBTYPE', (str,16)),
('TARGETID', 'i8'),
('DELTACHI2', 'f8'),
('BRICKNAME', (str,8))]
zbest = Table(np.zeros(nqso, dtype=columns))
zbest['CHI2'][:] = 0.
zbest['Z'][:] = metadata['Z']
zbest['ZERR'][:] = 0.
zbest['ZWARN'][:] = 0
zbest['SPECTYPE'][:] = 'QSO'
zbest['SUBTYPE'][:] = ''
zbest['TARGETID'][:] = metadata['MOCKID']
zbest['DELTACHI2'][:] = 25.
hzbest = pyfits.convenience.table_to_hdu(zbest); hzbest.name='ZBEST'
hfmap = pyfits.convenience.table_to_hdu(fibermap); hfmap.name='FIBERMAP'
hdulist =pyfits.HDUList([pyfits.PrimaryHDU(),hzbest,hfmap])
hdulist.writeto(zbest_filename, overwrite=True)
hdulist.close() # see if this helps with memory issue
def dust_transmission(wave,ebv) :
Rv = 3.1
extinction = ext_odonnell(wave,Rv=Rv)
return 10**(-Rv*extinction*ebv/2.5)
def dust_transmission(wave, ebv):
Rv = 3.1
extinction = ext_odonnell(wave, Rv=Rv)
return 10**(-Rv * extinction * ebv / 2.5)