High-Redshift QSO Luminosity Functions with SWIRE

Details High-Redshift QSO Luminosity Functions with SWIRE High-Redshift QSO Luminosity Functions with SWIRE

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514307s&link_type=abstract

American Astronomical Society Meeting 205, #143.07; Bulletin of the American Astronomical Society, Vol. 36, p.1585

Astronomy and Astrophysics

Astronomy

Scientific paper

The Spitzer Wide-area InfraRed Extragalactic (SWIRE) Legacy Survey has imaged ˜ 49 sq. degrees in the mid to far-infrared with the Spitzer Space Telescope detecting over 2.5 million sources. Deep optical imaging (r ˜ 24) has been obtained in at least 4 bands over ˜ 30 sq. degrees to help characterize these IR galaxies. This optical data allows for an unprecedented search for high-redshift QSOs through identification of a continuum break due to Inter-Galactic absorption blueward of Lyman-alpha. Typical contaminants in these searches (stars and low-z ellipticals) have similar optical colors but have very blue mid-IR colors compared to the red mid-IR colors of QSOs. Therefore, we can efficiently remove interlopers by examining their IR SEDs. We verify our technique with SDSS quasars and search ˜ 2.5 mags fainter than the SDSS. We present the luminosity functions of U,g,r dropouts at z ˜ 3,4,5 respectively and compute the QSO contribution to the UV radiation field at 3 < z < 6.

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