Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840811r&link_type=abstract
American Astronomical Society, AAS Meeting #218, #408.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
This poster focus on the luminous star-forming galaxies at 1.5 < z < 3 potentially missed by the traditional color selection techniques because of dust extinction. We quantify the fraction of these sources and their contribution to the IR luminosity and cosmic star formation density at high redshift. Our work is based on a sample of 24microns sources brighter than 80microJy taken from the Spitzer survey of the COSMOS field. Almost all of these sources have accurate photometric redshifts. I apply to this mid-IR selected sample the BzK and BM/BX criteria as well as the selections of the "IRAC peakers " and the "optically-faint IR-bright " galaxies, and I analyze the fraction of sources identified with these techniques. I also computed 8microns rest-frame luminosity from the 24microns fuxes of our sources, and considering the relationships between L8microns and LPaalpha and between L8microns and LIR, I derived the IR luminosity density and the SFR density for our MIPS sources. The BzK criterion offers an almost complete ( 90%) identification of the 24microns sources at 1.4 < z < 2.5. On the contrary, the BM/BX criterion miss 50% of the MIPS sources. We attribute this bias to the effect of extinction which redden the typical colors of galaxies. The contribution of these two selections to the IR luminosity density produced by all the sources brighter than 80microJy are from the same order. Moreover the criterion based on the presence of a stellar bump in their spectra ("IRAC peakers") miss up to 40% of the IR luminosity density while only 25% of the IR luminosity density at z 2 is produced by "optically-faint IR-bright" galaxies characterized by extreme mid-IR to optical flux ratios.
Aussel Herve
Capak Peter
Ilbert Olivier
Kartaltepe Jeyhan
Le Floc'h Emeric
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