Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication at the ApJ. 35 pages including 24 figures. Updated to match version in press
Scientific paper
10.1086/588038
We study zCOSMOS-bright optical spectra for 609 Spitzer/MIPS 24 micron-selected galaxies with S(24um)> 0.30 mJy and I<22.5 (AB mag) over 1.5 sq. deg. of the COSMOS field. From emission-line diagnostics we find that: 1) star-formation rates (SFR) derived from the observed Halpha and Hbeta lines underestimate, on average, the total SFR by factors ~5 and 10, respectively; 2) both the Calzetti et al. and the Milky Way reddening laws are suitable to describe the extinction observed in infrared (IR) sources in most cases; 3) some IR galaxies at z<0.3 have low abundances, but many others with similar IR luminosities and redshifts are chemically enriched; 4) The average [OIII]/Hbeta ratios of nuLnu(24um)>10^11 Lsun galaxies at 0.6
Aussel Herve
Caputi Karina I.
Carollo Marcella C.
Contini Thierry
Frayer David
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