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Title: S5 0716+714: GeV variability study

Abstract

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.

Authors:
 [1];  [2];  [3];  [2];  [2]
  1. Max-Planck-Institut fur Radioastronomie (MPIfR) (Germany); Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak (India)
  2. Max-Planck-Institut fur Radioastronomie (MPIfR) (Germany)
  3. Universite Bordeaux 1, CNRS/IN2p3, Centre d Etudes Nucleaires de Bordeaux Gradignan (France)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi-LAT Collaboration
OSTI Identifier:
1356588
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Advances in Space Research
Additional Journal Information:
Journal Volume: 51; Journal Issue: 12; Journal ID: ISSN 0273-1177
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Galaxies; Active – BL Lacertae objects; Individual; S5 0716+714 – gamma rays

Citation Formats

Rani, B., Krichbaum, T. P., Lott, B., Fuhrmann, L., and Zensus, J. A. S5 0716+714: GeV variability study. United States: N. p., 2013. Web. doi:10.1016/j.asr.2013.02.010.
Rani, B., Krichbaum, T. P., Lott, B., Fuhrmann, L., & Zensus, J. A. S5 0716+714: GeV variability study. United States. doi:10.1016/j.asr.2013.02.010.
Rani, B., Krichbaum, T. P., Lott, B., Fuhrmann, L., and Zensus, J. A. Tue . "S5 0716+714: GeV variability study". United States. doi:10.1016/j.asr.2013.02.010. https://www.osti.gov/servlets/purl/1356588.
@article{osti_1356588,
title = {S5 0716+714: GeV variability study},
author = {Rani, B. and Krichbaum, T. P. and Lott, B. and Fuhrmann, L. and Zensus, J. A.},
abstractNote = {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.},
doi = {10.1016/j.asr.2013.02.010},
journal = {Advances in Space Research},
number = 12,
volume = 51,
place = {United States},
year = {2013},
month = {2}
}

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