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Dependence of Dust Obscuration on Star Formation Rates in Galaxies.pdf

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Dependence of Dust Obscuration on Star Formation Rates in Galaxies

a r X i v : a s t r o - p h / 0 3 0 7 1 7 5 v 1 9 J u l 2 0 0 3 Draft version February 2, 2008 Preprint typeset using LATEX style emulateapj v. 11/12/01 DEPENDENCE OF DUST OBSCURATION ON STAR FORMATION RATES IN GALAXIES J. Afonso1,2,3, A. Hopkins4,5, B. Mobasher6,7, and C. Almeida1,8 Draft version February 2, 2008 ABSTRACT Many investigations of star formation rates (SFRs) in galaxies have explored details of dust obscura- tion, with a number of recent analyses suggesting that obscuration appears to increase in systems with high rates of star formation. To date these analyses have been primarily based on nearby (z ≤ 0.03) or UV selected samples. Using 1.4GHz imaging and optical spectroscopic data from the Phoenix Deep Survey, the SFR-dependent obscuration is explored. The use of a radio selected sample shows that previous studies exploring SFR-dependent obscurations have been biased against obscured galaxies. The observed relation between obscuration and SFR is found to be unsuitable to be used as an obscuration measure for individual galaxies. Nevertheless, it is shown to be successful as a first order correction for large samples of galaxies where no other measure of obscuration is available, out to intermediate redshifts (z ≈ 0.8). Subject headings: galaxies: evolution — galaxies: starburst — radio continuum: galaxies 1. introduction Dust obscuration is currently recognized as one of the most serious sources of uncertainty in studies of galaxy evolution. With the recent results of far-infrared (FIR) and sub-mm observations revealing an ever increasing number of dusty star forming galaxies (e.g., Genzel Ce- sarsky 2000; Ivison et al. 2000; Smail et al. 2002), the need to unify measures of star formation rate (SFR) from inde- pendent indicators at different wavelengths (e.g., UV, Hα, FIR, radio continuum) is as pressing as ever. A relatively simple prescription for dust extinction cor- rection to SFR has been suggested by Hopkins et al. (2001) and Sullivan et