galpy.util.conversion.dens_in_criticaldens¶
- galpy.util.conversion.dens_in_criticaldens(vo, ro, H=70.0)[source]¶
NAME:
dens_in_criticaldens
PURPOSE:
convert density to units of the critical density
INPUT:
vo - velocity unit in km/s
ro - length unit in kpc
H= (default: 70) Hubble constant in km/s/Mpc
OUTPUT:
conversion from units where vo=1. at ro=1. to units of the critical density
HISTORY:
2014-01-28 - Written - Bovy (IAS)