Star Formation Rate at z = 0.2 derived from Hₐlpha luminosities: constraint on the reddening
Tresse, Laurence · Maddox, Steve J.
Original · EN
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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