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The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars

by Ritz, S. , de Palma, F. , Gustafsson, M. , Mazziotta, M. N. , Giordano, F. , Hays, E. , Orlando, E. , Razzano, M. , Fusco, P. , Cavazzuti, E. , Claus, R. , Cohen-Tanugi, J. , Caliandro, G. A. , Perkins, J. S. , Gargano, F. , Lovellette, M. N. , Wood, M. , Stawarz, Łukasz , do Couto e Silva, E. , Tanaka, T. , Monte, C. , Monzani, M. E. , Charles, E. , Hayashida, M. , Cheung, C. C. , Takahashi, H. , Chekhtman, A. , Romoli, C. , Tosti, G. , Drell, P. S. , Dermer, C. D. , Longo, F. , Gehrels, N. , Germani, S. , Bruel, P. , Latronico, L. , Godfrey, G. , Morselli, A. , Wood, K. S. , Digel, S. W. , Jackson, M. S. , Chaves, R. C. G. , Reimer, O. , Lubrano, P. , Barbiellini, G. , Rau, A. , Schady, P. , Mizuno, T. , Ormes, J. F. , Spinelli, P. , Razzaque, S. , Bellazzini, R. , Rando, R. , Suson, D. J. , Baldini, L. , Fukazawa, Y. , Troja, E. , Giroletti, M. , Omodei, N. , Pesce-Rollins, M. , Scargle, J. D. , Sgrò, C. , Tramacere, A. , Michelson, P. F. , Ballet, J. , Franckowiak, A. , Orienti, M. , Caraveo, P. A. , Vitale, V. , Domínguez, A. , Chiang, J. , Nuss, E. , Loparco, F. , Blandford, R. D. , Vasileiou, V. , Ohno, M. , Kuss, M. , Lande, J. , Cecchi, C. , Bloom, E. D. , Grenier, I. A. , Pivato, G. , Thayer, J. G. , Thompson, D. J. , Grov

in Absorption / Absorption spectra / Active Galactic Nuclei / Astronomy / Astrophysics / Attenuation / Background radiations / Blazars / Cosmic background radiation / Cosmology / Cosmology and Extra-Galactic Astrophysics / Earth, ocean, space / Emissions / Exact sciences and technology / Fields / Galaxies / gamma radiation / Gamma ray spectrum / Gamma rays / Gamma-ray sources ; gamma-ray bursts / Glast / Large-Area Telescope / Light / Modeling / Photons / Physics / Red shift / Research universities / Space research / Space telescopes / Spectra / Star & galaxy formation / Stars / Stellar systems. Galactic and extragalactic objects and systems. The universe / telescopes / Unidentified sources and radiation outside the solar system / Universe

2012

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The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars

2012

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2012

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Journal Article

The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars

Ritz, S.,

de Palma, F.,

Gustafsson, M.,

Mazziotta, M. N.,

Giordano, F.,

Hays, E.,

Orlando, E.,

Razzano, M.,

Fusco, P.,

Cavazzuti, E.,

Claus, R.,

Cohen-Tanugi, J.,

Caliandro, G. A.,

Perkins, J. S.,

Gargano, F.,

Lovellette, M. N.,

Wood, M.,

Stawarz, Łukasz,

do Couto e Silva, E.,

Tanaka, T.,

Monte, C.,

Monzani, M. E.,

Charles, E.,

Hayashida, M.,

Cheung, C. C.,

Takahashi, H.,

Chekhtman, A.,

Romoli, C.,

Tosti, G.,

Drell, P. S.,

Dermer, C. D.,

Longo, F.,

Gehrels, N.,

Germani, S.,

Bruel, P.,

Latronico, L.,

Godfrey, G.,

Morselli, A.,

Wood, K. S.,

Digel, S. W.,

Jackson, M. S.,

Chaves, R. C. G.,

Reimer, O.,

Lubrano, P.,

Barbiellini, G.,

Rau, A.,

Schady, P.,

Mizuno, T.,

Ormes, J. F.,

Spinelli, P.,

Razzaque, S.,

Bellazzini, R.,

Rando, R.,

Suson, D. J.,

Baldini, L.,

Fukazawa, Y.,

Troja, E.,

Giroletti, M.,

Omodei, N.,

Pesce-Rollins, M.,

Scargle, J. D.,

Sgrò, C.,

Tramacere, A.,

Michelson, P. F.,

Ballet, J.,

Franckowiak, A.,

Orienti, M.,

Caraveo, P. A.,

Vitale, V.,

Domínguez, A.,

Chiang, J.,

Nuss, E.,

Loparco, F.,

Blandford, R. D.,

Vasileiou, V.,

Ohno, M.,

Kuss, M.,

Lande, J.,

Cecchi, C.,

Bloom, E. D.,

Grenier, I. A.,

Pivato, G.,

Thayer, J. G.,

Thompson, D. J.,

Grov

2012

Overview

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 ~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.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS),AAAS

Subject

Absorption

/ Absorption spectra

/ Active Galactic Nuclei

/ Astronomy

/ Astrophysics

/ Attenuation

/ Background radiations

/ Blazars

/ Cosmic background radiation

/ Cosmology

/ Cosmology and Extra-Galactic Astrophysics