diff options
Diffstat (limited to 'fg21sim/utils/convert.py')
| -rw-r--r-- | fg21sim/utils/convert.py | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/fg21sim/utils/convert.py b/fg21sim/utils/convert.py index 1ada6ae..fc9a228 100644 --- a/fg21sim/utils/convert.py +++ b/fg21sim/utils/convert.py @@ -1,15 +1,14 @@ -# Copyright (c) 2016-2017 Weitian LI <weitian@aaronly.me> +# Copyright (c) 2016 Weitian LI <liweitianux@live.com> # MIT license """ Utilities for conversion among common astronomical quantities. """ +import numpy as np import astropy.units as au import numba -from .units import (Constants as AC, UnitConversions as AUC) - def Fnu_to_Tb(Fnu, omega, freq): """Convert flux density to brightness temperature, using the @@ -93,11 +92,11 @@ def Sb_to_Tb_fast(Sb, freq): Calculated brightness temperature, unit [ K ] """ # NOTE: `radian` is dimensionless - rad2_to_deg2 = AUC.rad2deg ** 2 + rad2_to_deg2 = np.rad2deg(1.0) * np.rad2deg(1.0) Sb_rad2 = Sb * rad2_to_deg2 # unit: [ Jy/rad^2 ] -> [ Jy ] - c = AC.c # speed of light, [ cm/s ] - k_B = AC.k_B # Boltzmann constant, [ erg/K ] - coef = 1e-35 # unit conversion factor + c = 29979245800.0 # speed of light, [ cm/s ] + k_B = 1.3806488e-16 # Boltzmann constant, [ erg/K ] + coef = 1e-35 # take care the unit conversions Tb = coef * (Sb_rad2 * c*c) / (2 * k_B * freq*freq) # unit: [ K ] return Tb |