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An empirical approach to the extragalactic background light from AEGIS galaxy SED-type fractions

Published online by Cambridge University Press:  17 August 2012

Alberto Domínguez
Alberto Domínguez*
Affiliation:
UCO/Lick Observatory, Dept. of Astronomy & Astrophysics, University of California, Santa Cruz, CA 95064, USA Dept. of Physics, University of California, Santa Cruz, CA 95064, USA Now at: Dept. of Physics & Astronomy, University of Caliornia, Riverside, CA 92521, USA email: alberto.dominguez@ucr.edu
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Abstract

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The extragalactic background light (EBL) is of fundamental importance both for understanding the entire process of galaxy evolution and for γ-ray astronomy. However, the overall spectrum of the EBL between 0.1 and 1000 μm has never been determined directly, neither from observed luminosity functions (LFs), over a wide redshift range, nor from any multiwavelength observation of galaxy spectral energy distributions (SEDs). The evolving overall spectrum of the EBL is derived here utilizing a novel method based on observations only. It is emphasized that the local EBL seems already well constrained from the UV up to the mid-IR. Different independent methodologies such as direct measurement, galaxy counts, γ-ray attenuation and realistic EBL modelings point towards the same EBL intensity level. Therefore, a relevant contribution from Pop III stars to the local EBL seems unlikely.

Keywords

galaxies: formationgalaxies: evolutioncosmology: observations – diffuse radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 442 - 445
Copyright
Copyright © International Astronomical Union 2012

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