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The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
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2012 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 338, no 6111, 1190-1192 p.Article in journal (Refereed) Published
Abstract [en]

The light emitted by stars and accreting compact objects through the history of the universe is encoded in the intensity of the extragalactic background light (EBL). Knowledge of the EBL is important to understand the nature of star formation and galaxy evolution, but direct measurements of the EBL are limited by galactic and other foreground emissions. Here, we report an absorption feature seen in the combined spectra of a sample of gamma-ray blazars out to a redshift of z similar to 1.6. This feature is caused by attenuation of gamma rays by the EBL at optical to ultraviolet frequencies and allowed us to measure the EBL flux density in this frequency band.

Place, publisher, year, edition, pages
2012. Vol. 338, no 6111, 1190-1192 p.
Keyword [en]
Active Galactic Nuclei, Large-Area Telescope, 1st Stars; Radiative-Transfer, Universe, Absorption, Redshift; Opacity, Fields, Glast
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-107609DOI: 10.1126/science.1227160ISI: 000311666200040ScopusID: 2-s2.0-84870185806OAI: diva2:577761
Knut and Alice Wallenberg Foundation

QC 20121217

Available from: 2012-12-17 Created: 2012-12-14 Last updated: 2012-12-17Bibliographically approved

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Jackson, Miranda S.
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Particle and Astroparticle Physics
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