lookback2z: Redshift at a given Lookback Time

In astro: Astronomy Functions, Tools and Routines

Description

Calculates the lookback time (light travel time)

Usage

lookback2z(t = 1, steps = 10, H = 70, M = 0.3, L = 1-M, K = 1-M-L, 
           units = "Gyr")

Arguments

t	time
steps	number of accuracy steps
H	Hubble constant (km/s/Mpc)
M	Omega M - matter
L	Omega L - energy
K	Omega K - curvature
units	input units [Gyr/s]

Details

This is a very crude inverse variation of the 'lookback' function. As such, the output result should be used as a guide only.

Value

Redshift at a given lookback time with the given cosmology.

Author(s)

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.