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The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
M. Ackermann ,
M. Ajello ,
A. Allafort ,
P. Schady ,
L. Baldini ,
J. Ballet ,
G. Barbiellini ,
D. Bastieri ,
R. Bellazzini ,
R. D. Blandford ,
E. D. Bloom ,
A. W. Borgland ,
E. Bottacini ,
A. Bouvier ,
J. Bregeon ,
M. Brigida ,
P. Bruel ,
R. Buehler ,
S. Buson ,
G. A. Caliandro ,
R. A. Cameron ,
P. A. Caraveo ,
E. Cavazzuti ,
C. Cecchi ,
E. Charles ,
R. C. G. Chaves ,
A. Chekhtman ,
C. C. Cheung ,
J. Chiang ,
G. Chiaro ,
S. Ciprini ,
R. Claus ,
J. Cohen-Tanugi ,
J. Conrad ,
S. Cutini ,
F. D'Ammando ,
F. de Palma ,
C. D. Dermer ,
S. W. Digel ,
E. do Couto e Silva ,
A. Dominguez ,
P. S. Drell ,
A. Drlica-Wagner ,
C. Favuzzi ,
S. J. Fegan ,
W. B. Focke ,
A. Franckowiak ,
Y. Fukazawa ,
S. Funk ,
P. Fusco ,
F. Gargano ,
D. Gasparrini ,
N. Gehrels ,
S. Germani ,
N. Giglietto ,
F. Giordano ,
M. Giroletti ,
T. Glanzman ,
G. Godfrey ,
I. A. Grenier ,
J. E. Grove ,
S. Guiriec ,
M. Gustafsson ,
D. Hadasch ,
M. Hayashida ,
E. Hays ,
M. S. Jackson ,
T. Jogler ,
J. Kataoka ,
J. Knodlseder ,
M. Kuss ,
J. Lande ,
S. Larsson ,
L. Latronico ,
F. Longo ,
F. Loparco ,
M. N. Lovellette ,
P. Lubrano ,
M. N. Mazziotta ,
J. E. McEnery ,
J. Mehault ,
P. F. Michelson ,
T. Mizuno ,
C. Monte ,
M. E. Monzani ,
A. Morselli ,
I. V. Moskalenko ,
S. Murgia ,
A. Tramacere ,
E. Nuss ,
J. Greiner ,
M. Ohno ,
T. Ohsugi ,
N. Omodei ,
M. Orienti ,
E. Orlando ,
J. F. Ormes ,
D. Paneque ,
J. S. Perkins ,
M. Pesce-Rollins ,
F. Piron ,
G. Pivato ,
T. A. Porter ,
S. Raino ,
R. Rando ,
M. Razzano ,
S. Razzaque ,
A. Reimer ,
O. Reimer ,
L. C. Reyes ,
S. Ritz ,
A. Rau ,
C. Romoli ,
M. Roth ,
M. Sanchez-Conde ,
D. A. Sanchez ,
J. D. Scargle ,
C. Sgro ,
E. J. Siskind ,
G. Spandre ,
P. Spinelli ,
L. Stawarz ,
D. J. Suson ,
H. Takahashi ,
T. Tanaka ,
J. G. Thayer ,
D. J. Thompson ,
L. Tibaldo ,
M. Tinivella ,
D. F. Torres ,
G. Tosti ,
E. Troja ,
T. L. Usher ,
J. Vandenbroucke ,
V. Vasileiou ,
G. Vianello ,
V. Vitale ,
A. P. Waite ,
B. L. Winer ,
K. S. Wood ,
M. Wood
November 29 2012
November 01 2012
There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.
Abstract
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.
Related collections
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G Fossati, L. Maraschi, A. Celotti … (1998)
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