mag2flux: Convert from astronomical magnitudes to flux (ergs/s/cm^2/A)

In astrolibR: Astronomy Users Library

Description

Convert from astronomical magnitudes to flux (ergs/s/cm^2/A)

Usage

mag2flux(mag, zero_pt=21.10, ABwave=F)

Arguments

mag	magnitude, scalar or vector
zero_pt	zero point level of the magnitude (default = 21.1)
ABwave	wavelength for conversion to Oke AB magnitudes, in Angstroms (optional)

Details

The default zero point of 21.1 mag is from Code et al. (1976). It is ignored of the ABwave parameter is supplied.

If ABwave is not supplied, the routine returns magnitudes given by the expression

mag <- -2.5*log10(flux) - zero_pt. If ABwave is supplied, then the routine returns AB magnitudes from Oke and Gunn (1983) according to

abmag <- -2.5*log10(flux) - 5*log10(ABwave) - 2.406.

Use mag2flux for conversions in the opposite direction.

Value

flux	flux, in erg cm-2 s-1 A-1, scalar or vector

Author(s)

Converted to IDL from Yeoman's Comet Ephemeris Generator, B. Pfarr, STX, 1988

R adaptation by Arnab Chakraborty (June 2013)

References

Oke, J. B. and Gunn, J. E., 1983, Secondary standard stars for absolute spectrophotometry, Astrophysical Journal, 266, 713-717

Examples

mag2flux(19.8)

ytext <- expression(Flux~~ (erg/s~cm^2~A))
plot(seq(2000,5000,length=100), flux2mag(seq(15, 20,length=100)), pch=20)

astrolibR documentation built on May 2, 2019, 3:26 a.m.