coscalc: Calculates Cosmological Parameters

In astro: Astronomy Functions, Tools and Routines

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)

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'.

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

Author(s)

Lee Kelvin, Aaron Robotham

Maintainer: Lee Kelvin <[e-mail]>

References

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

See Also

The astronomy package: astro.

astro documentation built on May 2, 2019, 2:14 a.m.