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Title: Fermi Large Area Telescope Constraints On The Gamma-Ray Opacity Of The Universe

Abstract

The extragalactic background light (EBL) includes photons with wavelengths from ultraviolet to infrared, which are effective at attenuating gamma rays with energy above ~10 GeV during propagation from sources at cosmological distances. This results in a redshift- and energy-dependent attenuation of the γ-ray flux of extragalactic sources such as blazars and gamma-ray bursts (GRBs). The Large Area Telescope on board Fermi detects a sample of γ-ray blazars with redshift up to z ~ 3, and GRBs with redshift up to z ~ 4.3. Using photons above 10 GeV collected by Fermi over more than one year of observations for these sources, we investigate the effect of γ-ray flux attenuation by the EBL. We place upper limits on the γ-ray opacity of the universe at various energies and redshifts and compare this with predictions from well-known EBL models. We find that an EBL intensity in the optical-ultraviolet wavelengths as great as predicted by the "baseline" model of Stecker et al. can be ruled out with high confidence.

Authors:
 [1]
  1. Naval Research Lab. (NRL), Washington, DC (United States); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357517
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 723; Journal Issue: 2; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Abdo, A. A. Fermi Large Area Telescope Constraints On The Gamma-Ray Opacity Of The Universe. United States: N. p., 2010. Web. doi:10.1088/0004-637X/723/2/1082.
Abdo, A. A. Fermi Large Area Telescope Constraints On The Gamma-Ray Opacity Of The Universe. United States. doi:10.1088/0004-637X/723/2/1082.
Abdo, A. A. Tue . "Fermi Large Area Telescope Constraints On The Gamma-Ray Opacity Of The Universe". United States. doi:10.1088/0004-637X/723/2/1082. https://www.osti.gov/servlets/purl/1357517.
@article{osti_1357517,
title = {Fermi Large Area Telescope Constraints On The Gamma-Ray Opacity Of The Universe},
author = {Abdo, A. A.},
abstractNote = {The extragalactic background light (EBL) includes photons with wavelengths from ultraviolet to infrared, which are effective at attenuating gamma rays with energy above ~10 GeV during propagation from sources at cosmological distances. This results in a redshift- and energy-dependent attenuation of the γ-ray flux of extragalactic sources such as blazars and gamma-ray bursts (GRBs). The Large Area Telescope on board Fermi detects a sample of γ-ray blazars with redshift up to z ~ 3, and GRBs with redshift up to z ~ 4.3. Using photons above 10 GeV collected by Fermi over more than one year of observations for these sources, we investigate the effect of γ-ray flux attenuation by the EBL. We place upper limits on the γ-ray opacity of the universe at various energies and redshifts and compare this with predictions from well-known EBL models. We find that an EBL intensity in the optical-ultraviolet wavelengths as great as predicted by the "baseline" model of Stecker et al. can be ruled out with high confidence.},
doi = {10.1088/0004-637X/723/2/1082},
journal = {Astrophysical Journal},
number = 2,
volume = 723,
place = {United States},
year = {2010},
month = {10}
}

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    Works referencing / citing this record:

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