astrolibR (version 0.1)

calz_unred: Deredden a galaxy spectrum using the Calzetti et al. (2000) recipe

Description

Deredden a galaxy spectrum using the Calzetti et al. (2000) recipe

Usage

calz_unred(wave,flux,ebv,R_V)

Arguments

wave

wavelength in Angstroms, scalar or N-vector

flux

calibrated flux vector, scalar or N-vector

ebv

color excess E(B-V), scalar

R_V

ratio of total to selected extinction, defauly=4.05 (optional)

Value

funred

unreddened flux, scalar or N-vector.

Details

Calzetti et al. (2000) developed a recipe for dereddening the spectra of galaxies where massive stars dominate the radiation output, valid between 0.12 to 2.2 microns. Reddening values are extrapolated between 0.12 and 0.0912 microns. Calzetti et al. (2000) estimate R_V = 4.05 +/- 0.80 from optical-IR observations of four starburst galaxies.

If a negative E(B-V) is supplied, then fluxes will be reddened rather than deredenned. Note that the supplied color excess should be that derived for the stellar continuum, ebv(stars), which is related to the reddening derived from the gas, ebv(gas), via the Balmer decrement by ebv(stars) = 0.44*ebv(gas).

Output funred values will be zero outside the wavelength domain 0.0912 to 2.2 microns.

References

Calzetti, D., Armus, L., Bohlin, R. C., Kinney, A. L., Koorneef, J. & Storchi-Bergmann, T., The dust content and opacity of actively star-forming galaxies, Astrophysical Journal, 533, 682-695, 2000. http://adsabs.harvard.edu/abs/2000ApJ...533..682C

See Also

ccm_unred

Examples

w <- 1200 + seq(50, 2000, by=50)  # wavelength vector
f <- rep(1, length(w))   # flat initial spectrum
calz_unred(w, f, ebv=0.1)