units and constants (sf3dmodels.utils)

sf3dmodels.utils.units Module

• units in SI (metres, kilograms, seconds):

MSun = 1.9891e30

RSun = 6.96e8

LSun = 3.828e26

TSun = 5780.

yr = 31557600.

MSun_yr = MSun/yr

au = 1.495978707e11

pc = 206264.806247*au

cm = 100.

rad2arcs = 206264.806247

amu = 1.66053904e-27 #kg ->atomic mass unit

sf3dmodels.utils.constants Module

• constants in SI (metres, kilograms, seconds):

mp = 1.00727647*amu #(kg) proton mass

mH = 1.00794*amu #(kg) hydrogen mass

G = 6.67384e-11 #(N m^2 kg^-2) Cavendish-gravitational constant

kb = 1.38064852e-23 #(J K^-1) Boltzmann constant

sigma = 5.670373e-8 #(W m^-2 K^-4) Stefan-Boltzmann constant

temp_cmb = 2.72548 #(K) CMB black-body temperature