def make_cosmic_sfr(CSP_dir):
SFHs_fnames = glob.glob(os.path.join(CSP_dir, 'SFHs_*.fits'))
nsubpersfh = fits.getval(SFHs_fnames[0], ext=0, keyword='NSUBPER')
SFHs = np.row_stack(
[fits.getdata(fn_, 'allsfhs') / fits.getdata(fn_, 'mformed')[::nsubpersfh, None]
for fn_ in SFHs_fnames])
ts = fits.getdata(SFHs_fnames[0], 'allts')
zs, zmasks = zip(*[masked_z_at_value(WMAP9.age, t_ * u.Gyr) for t_ in ts])
zs = np.ma.array(zs, mask=zmasks)
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
SFRDmean = SFHs.mean(axis=0) / WMAP9.scale_factor(zs)**3.
ax.plot(1. / WMAP9.scale_factor(zs), SFRDmean / SFRDmean.max())
ax.set_xlim([1., 1. / WMAP9.scale_factor(10.)])
ax.set_yscale('log')
ax.set_ylim([.009, 1.05])
ax.set_xlabel(r'$\frac{1}{a}$', size='x-small')
ax.set_ylabel(r'$\log{\psi}$', size='x-small')
ax.tick_params(labelsize='x-small', which='both')
ax_ = ax.twiny()
ax_.set_xlim(ax.get_xlim())
zticks = np.linspace(0., 10., 11)
inv_sf_ticks = 1. / WMAP9.scale_factor(zticks)
ax_.set_xticks(inv_sf_ticks, minor=False)
ax_.set_xticklabels(zticks)
ax_.tick_params(labelsize='x-small')
ax_.set_xlabel(r'$z$', size='x-small')
fig.suptitle('``Cosmic" SFR', size='small')
savefig(fig, 'CosmicSFR.png', CSP_dir, close=True)
def grid(Nage=80, NZ=20, nebular=True, dust=False):
"""
Generate grid of spectra with FSPS
Returns:
spec (array, float) spectra, dimensions NZ*Nage
metallicities (array, float) metallicity array, units Z / Zsol
scale_factors (array, flota) age array in units of the scale factor
wl (array, float) wavelength array in Angstroms
"""
if dust:
sp = fsps.StellarPopulation(zcontinuous=1,
sfh=0,
logzsol=0.0,
add_neb_emission=nebular,
dust_type=2,
dust2=0.2,
cloudy_dust=True,
dust1=0.0)
else:
sp = fsps.StellarPopulation(zcontinuous=1,
sfh=0,
cloudy_dust=True,
logzsol=0.0,
add_neb_emission=nebular)
wl = np.array(sp.get_spectrum(tage=13, peraa=True)).T[:, 0]
ages = np.logspace(-3.5,
np.log10(cosmo.age(0).value - 0.4),
num=Nage,
base=10)
scale_factors = cosmo.scale_factor(
[z_at_value(cosmo.lookback_time, age * u.Gyr) for age in ages])
metallicities = np.linspace(-3, 1, num=NZ) # log(Z / Zsol)
spec = np.zeros((len(metallicities), len(ages), len(wl)))
for i, Z in enumerate(metallicities):
for j, a in enumerate(ages):
sp.params['logzsol'] = Z
if nebular: sp.params['gas_logz'] = Z
spec[i, j] = sp.get_spectrum(tage=a, peraa=True)[1] # Lsol / AA
return spec, scale_factors, metallicities, wl
def make_cosmic_sfr(CSP_dir):
SFHs_fnames = glob.glob(os.path.join(CSP_dir, 'SFHs_*.fits'))
nsubpersfh = fits.getval(SFHs_fnames[0], ext=0, keyword='NSUBPER')
SFHs = np.row_stack([
fits.getdata(fn_, 'allsfhs') /
fits.getdata(fn_, 'mformed')[::nsubpersfh, None] for fn_ in SFHs_fnames
])
ts = fits.getdata(SFHs_fnames[0], 'allts')
zs, zmasks = zip(*[masked_z_at_value(WMAP9.age, t_ * u.Gyr) for t_ in ts])
zs = np.ma.array(zs, mask=zmasks)
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
SFRDmean = SFHs.mean(axis=0) / WMAP9.scale_factor(zs)**3.
ax.plot(1. / WMAP9.scale_factor(zs), SFRDmean / SFRDmean.max())
ax.set_xlim([1., 1. / WMAP9.scale_factor(10.)])
ax.set_yscale('log')
ax.set_ylim([.009, 1.05])
ax.set_xlabel(r'$\frac{1}{a}$', size='x-small')
ax.set_ylabel(r'$\log{\psi}$', size='x-small')
ax.tick_params(labelsize='x-small', which='both')
ax_ = ax.twiny()
ax_.set_xlim(ax.get_xlim())
zticks = np.linspace(0., 10., 11)
inv_sf_ticks = 1. / WMAP9.scale_factor(zticks)
ax_.set_xticks(inv_sf_ticks, minor=False)
ax_.set_xticklabels(zticks)
ax_.tick_params(labelsize='x-small')
ax_.set_xlabel(r'$z$', size='x-small')
fig.suptitle('``Cosmic" SFR', size='small')
savefig(fig, 'CosmicSFR.png', CSP_dir, close=True)