astro (version 1.2)

lookback: Lookback Time

Description

Calculates the lookback time (light travel time)

Usage

lookback(z = 1, H = 70, M = 0.3, L = 1-M, K = 1-M-L, units = "Gyr")

Arguments

z

redshift

H

Hubble constant (km/s/Mpc)

M

Omega M - matter

L

Omega L - energy

K

Omega K - curvature

units

output units [Gyr/s]

Value

Lookback time in indicated units to the given redshift with the given cosmology.

References

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

See Also

The astronomy package: astro.