Star Formation Rate at z = 0.2 derived from H_alpha luminosities: constraint on the reddening

Details Star Formation Rate at z = 0.2 derived from H_alpha luminosities: constraint on the reddening Star Formation Rate at z = 0.2 derived from H_alpha luminosities: constraint on the reddening

1997-12-09

arxiv.org/abs/astro-ph/9712130v1

Astronomy and Astrophysics

Astrophysics

4 pages, LaTeX (macro paspconf.sty). To appear in "The Young Universe", eds. S. D'Odorico, A. Fontana, E. Giallongo, A.S.P. Co

Scientific paper

We discuss the relative merits of using UV and H_alpha as star formation indicators from galaxy surveys. In particular, comparing UV and H_alpha 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 H_alpha luminosities argues for a universal IMF slope. The H_alpha 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 H_alpha luminosities.

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