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author | Aaron LI <aly@aaronly.me> | 2019-01-19 11:44:36 +0800 |
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committer | Aaron LI <aly@aaronly.me> | 2019-01-19 11:44:36 +0800 |
commit | 6d5ad484a25e3371a68ac45dd179c56a03fb1caa (patch) | |
tree | 879c10522dba1c2131be77a6c997edf38e971192 /fg21sim/extragalactic/pointsources/psparams.py | |
parent | fc3ebe7d8fea03bbd35961e11427af6291ee46f8 (diff) | |
download | fg21sim-6d5ad484a25e3371a68ac45dd179c56a03fb1caa.tar.bz2 |
Purge obsolete pointsources
Diffstat (limited to 'fg21sim/extragalactic/pointsources/psparams.py')
-rw-r--r-- | fg21sim/extragalactic/pointsources/psparams.py | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/fg21sim/extragalactic/pointsources/psparams.py b/fg21sim/extragalactic/pointsources/psparams.py deleted file mode 100644 index 823af72..0000000 --- a/fg21sim/extragalactic/pointsources/psparams.py +++ /dev/null @@ -1,79 +0,0 @@ -# Copyright (c) 2016 Zhixian MA <zxma_sjtu@qq.com> -# MIT license - -""" -Basic parameters to be used in point sources simulation. - -References ----------- -[1] Angular diameter distance, - https://en.wikipedia.org/wiki/Angular_diameter_distance -[2] FlatLambdaCDM, - {http://docs.astropy.org/en/stable/api/astropy.cosmology. - FlatLambdaCDM.html#astropy.cosmology.FlatLambdaCDM} -""" - -from astropy.cosmology import FlatLambdaCDM - - -class PixelParams(): - """ - A class to transform cosmology distance to angles or pixels. - - Parameters - ------------ - H0: float - The hubble constant at z = 0, whose unit is km/s/Mpc - Om0: float - The total matter density. - ang_res: float - Angular resolution, i.e. degree per pixel. (May be useless) - ang_total: list - Total angles of the simulated sky region, whose unit is degree - z : float - Redshift - scale: float - The real object scale. - - Example - ------------ - >>> PixelParams = PixelParams(img_size=(1024,1024),ang_total=(5,5)) - """ - - # Hubble constant at z = 0 - H0 = 71.0 - # Omega0, total matter density - Om0 = 0.27 - # Redshift - z = 0.0 - # Cosmology calculator - cosmo = 0.0 - # angular diameter distance, [Mpc] - dA = 0.0 - # angular resolution - ang_res = 0.0 - - def __init__(self, z=0.0): - self.z = z - self.cosmo = FlatLambdaCDM(H0=self.H0, Om0=self.Om0) - - # angular diameter distance, [Mpc] - self.dA = self.cosmo.angular_diameter_distance(self.z).value - - def get_angle(self, scale=1.0): - """ - Input real object scale, and output the respect observed - angle, and pixels. - """ - ang = scale / self.dA # [rac] - - return ang - - def get_scale(self, ang=1.0): - """ - Input real observed scale, and output the respect - real object scale, and pixels. - """ - scale = ang * self.dA # [Mpc] - - return scale |