S5 0716+714: GeV variability study

Rani, B.; Krichbaum, T. P.; Lott, B.; Fuhrmann, L.; Zensus, J. A.

doi:10.1016/j.asr.2013.02.010

Title: S5 0716+714: GeV variability study

Journal Article · Tue Feb 19 00:00:00 EST 2013 · Advances in Space Research

DOI:https://doi.org/10.1016/j.asr.2013.02.010· OSTI ID:1356588

Rani, B. ^[1]; Krichbaum, T. P. ^[2]; Lott, B. ^[3]; Fuhrmann, L. ^[2]; Zensus, J. A. ^[2]

Max-Planck-Institut fur Radioastronomie (MPIfR) (Germany); Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak (India)
Max-Planck-Institut fur Radioastronomie (MPIfR) (Germany)
Universite Bordeaux 1, CNRS/IN2p3, Centre d Etudes Nucleaires de Bordeaux Gradignan (France)

The GeV observations by Fermi-LAT give us the opportunity to characterize the high-energy emission (100 MeV–300 GeV) variability properties of the BL Lac object S5 0716+714. In this study, we performed flux and spectral analysis of more than 3 year long (August 2008 to April 2012) Fermi-LAT data of the source. During this period, the source exhibits two different modes of flux variability with characteristic timescales of ~75 and ~140 days, respectively. In addition, we also notice that the flux variations are characterized by a weak spectral hardening. The GeV spectrum of the source shows a clear deviation from a simple power law, and is better explained by a broken power law. Similar to other bright Fermi blazars, the break energy does not vary with the source flux during the different activity states. Finally, we discuss several possible scenarios to explain the observed spectral break.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi-LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356588

Journal Information:: Advances in Space Research, Vol. 51, Issue 12; ISSN 0273-1177

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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References (21)

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