Star Formation Rate at z = 0.2 derived from Halpha luminosities: constraint on the reddening
Abstract
We discuss the relative merits of using UV and Halpha as star formation indicators from galaxy surveys. In particular, comparing UV and Halpha in the CFRS gives a limit of a factor 2.5 for the UV(2800 Angs.) flux extinction from dust, using the conversion factors of Madau et al. 1998 (Salpeter IMF, 0.1-125 solar mass). Our strong correlation between B and Halpha luminosities argues for a universal IMF slope. The Halpha luminosity function at z = 0.2 shows a faint end slope of alpha = -1.35, which is consistent with fading of short bursts of star formation. We also discuss the contribution of AGN to UV and Halpha luminosities.
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