astro (version 1.2)

coscalc: Calculates Cosmological Parameters

Description

Calculates several commonly used cosmological parameters using a given cosmology.

Usage

coscalc(z = 1, c = 3E8, H = 70, M = 0.3, L = 1-M,  K = 1-M-L, dunit = "Mpc", vunit = "Gpc3", tunit = "Gyr",  r = 1, inp = "arcsec", out = "kpc")

Arguments

z

redshift

c

speed of light (m/s)

H

Hubble constant (km/s/Mpc)

M

Omega M - matter

L

Omega L - energy

K

Omega K - curvature

dunit

outout distance units [Mpc/ly/m]

vunit

output volume units [Gpc3/ly3/m3]

tunit

output time units [Gyr/s]

r

radius/size

inp

input angular size units (see details)

out

output angular size units (see details)

Value

z

redshift

codist.los

comoving distance (line-of-sight)

codist.trans

comoving distance (transverse)

angdist

angular diameter distance

lumdist

luminosity distance

covol

comoving volume

lookback

lookback time

age

age of Universe at 'z'

angsize

angular size conversion

Details

'coscalc' brings together several commonly used cosmological distance/volume/time measurements as given by several other functions in the 'astro' package.

Units available for angular size conversion are: 'deg', 'rad' or 'arcsec' <==> 'm', 'pc', 'kpc' or 'Mpc'.

References

Hogg D. W., 1999, ArXiv Astrophysics e-prints, arXiv:astro-ph/9905116

See Also

The astronomy package: astro.