Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..147t&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
1
Galaxies: Active, Infrared: Galaxies, X-Rays: Galaxies
Scientific paper
We present a self-consistent implementation of the AGN unification paradigm, which postulates obscured AGN wherever there are unobscured AGN, to successfully explain the infrared, optical, and X-ray number counts of X-ray sources detected in deep fields. Assuming an average ratio of obscured to unobscured AGN of 3:1 (the local value) that decreases with luminosity, and including Compton-thick sources, we can explain the spectral shape and normalization of the extragalactic X-ray ``background'' as a superposition of unresolved AGN, predominantly at z ˜ 0.5-1.5 and L_x ˜ 10^43-10^44 ergs/s. The AGN contribution to the infrared background constrained from deep Spitzer observations of the GOODS fields is ˜ 2× lower than previously expected, about 3-6% in the 3-24 microns range. The possible dependence of the obscured to unobscured ratio with redshift is not well constrained; present data allow it to decrease or increase substantially beyond z ˜ 1.
Lira Paulina
Treister Ezequiel
Urry Claudia Megan
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