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authorAaron LI <aaronly.me@outlook.com>2016-10-24 22:25:26 +0800
committerAaron LI <aaronly.me@outlook.com>2016-10-24 22:25:26 +0800
commit0d686facc40237dd8fab4d721f870681d1c1415b (patch)
tree78f5145d7b78f4b90eddc125a8b65cdbe07a1da7 /fg21sim/extragalactic
parent200ac8cdc3661af0306b85d7589a13759a66ee41 (diff)
downloadfg21sim-0d686facc40237dd8fab4d721f870681d1c1415b.tar.bz2
extragalactic/clusters.py: Use "Fnu_to_Tb_fast()"
Diffstat (limited to 'fg21sim/extragalactic')
-rw-r--r--fg21sim/extragalactic/clusters.py28
1 files changed, 15 insertions, 13 deletions
diff --git a/fg21sim/extragalactic/clusters.py b/fg21sim/extragalactic/clusters.py
index 8249e3a..7da778e 100644
--- a/fg21sim/extragalactic/clusters.py
+++ b/fg21sim/extragalactic/clusters.py
@@ -23,7 +23,7 @@ import pandas as pd
from ..utils import write_fits_healpix
from ..utils.random import spherical_uniform
-from ..utils.convert import Fnu_to_Tb
+from ..utils.convert import Fnu_to_Tb_fast
from ..utils.grid import make_grid_ellipse, map_grid_to_healpix
@@ -228,7 +228,6 @@ class GalaxyClusters:
glat = 90.0 - np.degrees(theta)
self.catalog["glon"] = glon
self.catalog["glat"] = glat
- self.units["coord"] = au.deg
logger.info("Done add random positions for each cluster")
def _add_random_eccentricity(self):
@@ -353,7 +352,7 @@ class GalaxyClusters:
*cosmic mean mass density ρ_m = Ω_m * ρ_c,
therefore, the mass needs following conversion (which is an
approximation):
- M_{R&B} ~= M * sqrt(OmegaM0)
+ M_{R&B} ≈ M * sqrt(OmegaM0)
- The derived X-ray luminosity is for the 0.1-2.4 keV energy band.
- The X-ray-radio luminosity scaling relation adopted here is
derived at 1.4 GHz.
@@ -370,7 +369,7 @@ class GalaxyClusters:
#
logger.info("Calculating the radio luminosity (at 1.4 GHz) ...")
# Calculate the X-ray luminosity from mass
- # XXX: why the mass conversion ??
+ # NOTE: mass conversion (see also the above notes)
mass_RB = (self.catalog["mass"].data * self.units["mass"] *
self.catalog_prop["omega_m"]**0.5)
a_X = 0.449
@@ -389,7 +388,7 @@ class GalaxyClusters:
# Radio luminosity density (at 1.4 GHz) [ W/Hz ]
L_r = (a_r * 1e24 * (L_X / 1e45)**b_r) * h_conv2
self.catalog["luminosity"] = L_r
- self.catalog_prop["luminosity_freq"] = 1.4 * au.GHz
+ self.catalog_prop["luminosity_freq"] = 1400 * self.freq_unit
self.units["luminosity"] = au.W / au.Hz
logger.info("Done Calculate the radio luminosity")
@@ -428,10 +427,10 @@ class GalaxyClusters:
The spectral index of the power-law spectrum.
Note the *negative* sign in the formula.
frequency : float
- The frequency (unit: `self.freq_unit`) where the brightness
+ The frequency (unit: [ MHz ]) where the brightness
temperature requested.
size : 2-float tuple
- The (major, minor) axes (unit: `self.units["size"]`).
+ The (major, minor) axes (unit: [ deg ]).
The order of major and minor can be arbitrary.
Returns
@@ -447,14 +446,15 @@ class GalaxyClusters:
be calculated by extrapolating the spectrum, then convert the flux
density to derive the brightness temperature.
"""
- freq = frequency * self.freq_unit
- freq_ref = self.catalog_prop["luminosity_freq"]
+ freq = frequency # [ MHz ]
+ freq_ref = self.catalog_prop["luminosity_freq"].value
luminosity = luminosity * self.units["luminosity"]
- Lnu = luminosity * float(freq / freq_ref) ** (-specindex)
+ Lnu = luminosity * (freq / freq_ref) ** (-specindex)
Fnu = Lnu / (4*np.pi * (distance*self.units["distance"])**2)
- omega = size[0]*self.units["size"] * size[1]*self.units["size"]
- Tb = Fnu_to_Tb(Fnu, omega, freq)
- return Tb.value
+ Fnu_Jy = Fnu.to(au.Jy).value # [ Jy ]
+ omega = size[0] * size[1] # [ deg^2 ]
+ Tb = Fnu_to_Tb_fast(Fnu_Jy, omega, freq)
+ return Tb
def _simulate_templates(self):
"""Simulate the template (HEALPix) images for each cluster, and
@@ -649,7 +649,9 @@ class GalaxyClusters:
logger.info("Simulating {name} map at {freq} ({unit}) ...".format(
name=self.name, freq=frequency, unit=self.freq_unit))
hpmap_f = np.zeros(hp.nside2npix(self.nside))
+ # XXX/TODO: be parallel
for row in self.catalog.itertuples():
+ # TODO: progress bar
hpidx, hpval = self._simulate_single(row, frequency)
hpmap_f[hpidx] += hpval
#