def compute_glat_glon_distance(table):
x, y, z = table['x'].quantity, table['y'].quantity, table['z'].quantity
distance, glon, glat = astrometry.galactic(x, y, z)
phys_size = table['size_physical'].quantity
coordinate = SkyCoord(glon, glat, unit='deg', frame='galactic').transform_to('icrs')
ra, dec = coordinate.ra.deg, coordinate.dec.deg
r = np.sqrt(table['x'] ** 2 + table['y'] ** 2)
constant = 0.000291 / u.arcmin
size = phys_size / ((distance.to('pc')) * constant)
# Clip size because we have a min / max for allowed size in XML / science tools
size = np.clip(size.to('deg').value, 0.01, 100) * u.deg
# Add columns to table
table['distance'] = Column(distance, unit='kpc', description='Distance observer to source center')
table['GLON'] = Column(glon, unit='deg', description='Galactic longitude')
table['GLAT'] = Column(glat, unit='deg', description='Galactic latitude')
table['RA'] = Column(ra, unit='deg')
table['DEC'] = Column(dec, unit='deg')
table['size'] = Column(size, unit='deg')
table['galactocentric_r'] = Column(r, unit='kpc', description='Galactocentric radius in the xy plan')
return table
synt = Table()
# In[SNR]
q = Table.read(snrsfile, format='ascii')
en = q['E[TeV]'][0:40].data # TeV
glon, glat, f01, f1 = [], [], [], []
for i in np.arange(int(len(q) / 40)):
sed = q['diff_spectrum'][i * 40:(i + 1) * 40] # TeV cm-2 s-1
fl = sed / en**2. # cm-2 s-1 TeV-1
if (sum(fl) != 0):
pos = galactic(x=q['POS_Y'][i * 40] * u.kpc,
y=-q['POS_X'][i * 40] * u.kpc,
z=q['POS_Z'][i * 40] * u.kpc)
glon.append(pos[1].value)
glat.append(pos[2].value)
f01.append(ag.integ(en, fl, emin=0.1, emax=1000.)[0] / crab_01)
f1.append(ag.integ(en, fl, emin=1.0, emax=1000.)[0] / crab_1)
dic = {'GLON': glon, 'GLAT': glat, 'F01': f01, 'F1': f1}
snr = pd.DataFrame(dic)
# In[iSNR]
isnrs = Table.read(isnrsfile)
f01, f1 = [], []
for i in np.arange(len(isnrs)):
def add_observed_parameters(table, obs_pos=None):
"""Add observable parameters (such as sky position or distance).
Input table columns: x, y, z, extension, luminosity
Output table columns: distance, glon, glat, flux, angular_extension
Position of observer in cartesian coordinates.
Center of galaxy as origin, x-axis goes through sun.
Parameters
----------
table : `~astropy.table.Table`
Input table
obs_pos : tuple or None
Observation position (X, Y, Z) in Galactocentric coordinates (default: Earth)
Returns
-------
table : `~astropy.table.Table`
Modified input table with columns added
"""
obs_pos = obs_pos or [astrometry.D_SUN_TO_GALACTIC_CENTER, 0, 0]
# Get data
x, y, z = table["x"].quantity, table["y"].quantity, table["z"].quantity
vx, vy, vz = table["vx"].quantity, table["vy"].quantity, table["vz"].quantity
distance, glon, glat = astrometry.galactic(x, y, z, obs_pos=obs_pos)
# Compute projected velocity
v_glon, v_glat = astrometry.velocity_glon_glat(x, y, z, vx, vy, vz)
coordinate = SkyCoord(glon, glat, unit="deg", frame="galactic").transform_to("icrs")
ra, dec = coordinate.ra.deg, coordinate.dec.deg
# Add columns to table
table["distance"] = Column(
distance, unit="pc", description="Distance observer to source center"
)
table["GLON"] = Column(glon, unit="deg", description="Galactic longitude")
table["GLAT"] = Column(glat, unit="deg", description="Galactic latitude")
table["VGLON"] = Column(
v_glon.to("deg/Myr"),
unit="deg/Myr",
description="Velocity in Galactic longitude",
)
table["VGLAT"] = Column(
v_glat.to("deg/Myr"),
unit="deg/Myr",
description="Velocity in Galactic latitude",
)
table["RA"] = Column(ra, unit="deg", description="Right ascension")
table["DEC"] = Column(dec, unit="deg", description="Declination")
try:
luminosity = table["luminosity"]
flux = luminosity / (4 * np.pi * distance ** 2)
table["flux"] = Column(flux.value, unit=flux.unit, description="Source flux")
except KeyError:
pass
try:
extension = table["extension"]
angular_extension = np.degrees(np.arctan(extension / distance))
table["angular_extension"] = Column(
angular_extension,
unit="deg",
description="Source angular radius (i.e. half-diameter)",
)
except KeyError:
pass
return table
def test_galactic():
x = Quantity(0, "kpc")
y = Quantity(0, "kpc")
z = Quantity(0, "kpc")
reference = (Quantity(8.5, "kpc"), Quantity(0, "deg"), Quantity(0, "deg"))
assert galactic(x, y, z) == reference