astrolibR (version 0.1)

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

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)

Value

flux

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

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.

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)