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Probing the EBL Evolution at High Redshift Using GRBs Detected with the Fermi-LAT
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Number of Authors: 9
2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 850, no 1, 73Article in journal (Refereed) Published
Abstract [en]

The extragalactic background light (EBL), from ultraviolet to infrared wavelengths, is predominantly due to emission from stars, accreting black holes and reprocessed light due to Galactic dust. The EBL can be studied through the imprint it leaves, via gamma-gamma absorption of high-energy photons, in the spectra of distant.-ray sources. The EBL has been probed through the search for the attenuation it produces in the spectra of BL Lacertae (BL Lac) objects and individual.-ray bursts (GRBs). GRBs have significant advantages over blazars for the study of the EBL especially at high redshifts. Here we analyze a combined sample of 22 GRBs, detected by the Fermi Large Area Telescope between 65 MeV and 500 GeV. We report a marginal detection (at the similar to 2.8 sigma level) of the EBL attenuation in the stacked spectra of the source sample. This measurement represents a first constraint of the EBL at an effective redshift of similar to 1.8. We combine our results with prior EBL constraints and conclude that Fermi-LAT is instrumental to constrain the UV component of the EBL. We discuss the implications on existing empirical models of EBL evolution.

Place, publisher, year, edition, pages
2017. Vol. 850, no 1, 73
Keyword [en]
cosmology: observations, galaxies: high-redshift, gamma-ray burst: general, gamma-rays: observations, gamma-rays: theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149980DOI: 10.3847/1538-4357/aa917cISI: 000415832400016OAI: oai:DiVA.org:su-149980DiVA: diva2:1169038
Available from: 2017-12-22 Created: 2017-12-22 Last updated: 2017-12-22Bibliographically approved

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Ajello, M.Meyer, Manuel
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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