cosmoFns (version 1.1-1)

dimmingFactor: Flux dimming factor

Description

Function computes flux dimming factor in a flat cosmology.

Usage

dimmingFactor(z, omega.m = 0.27, omega.lambda = 0.73, H.0 = 71)

Value

Flux dimming factor, unnormalied. Mathematically, it is (1+z)/D.L^2. This is the factor that scales luminosity densitiy in the observed frame to flux density in the observed frame.

Arguments

z

Redshift

omega.m

Omega matter parameter

omega.lambda

Omega lambda parameter

H.0

Hubble constant in km/s/Mpc

Author

A. Harris

References

Hogg (2000), arXiv:astro-ph/9905116: section 7, part of equation (22)

See Also

D.L

Examples

z <- seq(0.1, 5, 0.1)
df <- dimmingFactor(z)
plot(z, df/max(df), t='l', xlab='z', ylab='Normalized dimming factor')