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:
-
- 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)
- 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. https://doi.org/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. https://doi.org/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 = {Tue Feb 19 00:00:00 EST 2013},
month = {Tue Feb 19 00:00:00 EST 2013}
}
Web of Science
Works referenced in this record:
FERMI /LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LIST
journal, June 2009
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal Supplement Series, Vol. 183, Issue 1
SPECTRAL PROPERTIES OF BRIGHT FERMI -DETECTED BLAZARS IN THE GAMMA-RAY BAND
journal, January 2010
- Abdo, A. A.; Ackermann, M.; Ajello, M.
- The Astrophysical Journal, Vol. 710, Issue 2
THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
journal, December 2011
- Ackermann, M.; Ajello, M.; Allafort, A.
- The Astrophysical Journal, Vol. 743, Issue 2
Discovery of very high Energy γ-Rays from the Blazar s5 0716+714
journal, October 2009
- Anderhub, H.; Antonelli, L. A.; Antoranz, P.
- The Astrophysical Journal, Vol. 704, Issue 2
AGILE detection of variable γ -ray activity from the blazar S5 0716+714 in September–October 2007
journal, September 2008
- Chen, A. W.; D'Ammando, F.; Villata, M.
- Astronomy & Astrophysics, Vol. 489, Issue 3
Disentangling the synchrotron and inverse Compton variability in the X-ray emission of the intermediate BL Lacertae object S5 0716+71
journal, September 2006
- Ferrero, E.; Wagner, S. J.; Emmanoulopoulos, D.
- Astronomy & Astrophysics, Vol. 457, Issue 1
ON THE BREAK IN THE FERMI -LARGE AREA TELESCOPE SPECTRUM OF 3C 454.3
journal, April 2010
- Finke, Justin D.; Dermer, Charles D.
- The Astrophysical Journal, Vol. 714, Issue 2
Simultaneous X-ray and optical observations of S5 0716+714 after the outburst of March 2004
journal, August 2006
- Foschini, L.; Tagliaferri, G.; Pian, E.
- Astronomy & Astrophysics, Vol. 455, Issue 3
Multiwavelength intraday variability of the BL Lacertae S5 0716+714: Multiwavelength variability of the BL Lac S5 0716+714
journal, August 2012
- Gupta, Alok C.; Krichbaum, T. P.; Wiita, P. J.
- Monthly Notices of the Royal Astronomical Society, Vol. 425, Issue 2
The Third EGRET Catalog of High‐Energy Gamma‐Ray Sources
journal, July 1999
- Hartman, R. C.; Bertsch, D. L.; Bloom, S. D.
- The Astrophysical Journal Supplement Series, Vol. 123, Issue 1
EGRET observations of the BL Lacertae objects 0716+714 and 0521-365
journal, March 1995
- Lin, Y. C.; Bertsch, D. L.; Dingus, B. L.
- The Astrophysical Journal, Vol. 442
An adaptive-binning method for generating constant-uncertainty/constant-significance light curves with Fermi -LAT data
journal, July 2012
- Lott, B.; Escande, L.; Larsson, S.
- Astronomy & Astrophysics, Vol. 544
Does the Blazar Gamma‐Ray Spectrum Harden with Increasing Flux? Analysis of 9 Years of EGRET Data
journal, March 2007
- Nandikotkur, Giridhar; Jahoda, Keith M.; Hartman, R. C.
- The Astrophysical Journal, Vol. 657, Issue 2
Detection of the host galaxy of S5 0716+714
journal, July 2008
- Nilsson, K.; Pursimo, T.; Sillanpää, A.
- Astronomy & Astrophysics, Vol. 487, Issue 2
GeV BREAKS IN BLAZARS AS A RESULT OF GAMMA-RAY ABSORPTION WITHIN THE BROAD-LINE REGION
journal, June 2010
- Poutanen, Juri; Stern, Boris
- The Astrophysical Journal, Vol. 717, Issue 2
Optical and radio behaviour of the BL Lacertae object 0716+714
journal, April 2003
- Raiteri, C. M.; Villata, M.; Tosti, G.
- Astronomy & Astrophysics, Vol. 402, Issue 1
Quasi-Periodic Oscillations of ∼15 Minutes in the Optical Light Curve of the bl lac s5 0716+714
journal, July 2010
- Rani, Bindu; Gupta, Alok C.; Joshi, U. C.
- The Astrophysical Journal, Vol. 719, Issue 2
Nearly Periodic Fluctuations in the Long-Term X-Ray Light Curves of the Blazars ao 0235+164 and 1es 2321+419
journal, April 2009
- Rani, Bindu; Wiita, Paul J.; Gupta, Alok C.
- The Astrophysical Journal, Vol. 696, Issue 2
Modelling the very high energy flare of 3C 279 using one-zone leptonic model: Modelling the VHE flare of 3C 279
journal, November 2011
- Sahayanathan, S.; Godambe, S.
- Monthly Notices of the Royal Astronomical Society, Vol. 419, Issue 2
Flicker of extragalactic radio sources at two frequencies
journal, September 1985
- Simonetti, J. H.; Cordes, J. M.; Heeschen, D. S.
- The Astrophysical Journal, Vol. 296
FERMI LARGE AREA TELESCOPE DETECTION OF BRIGHT γ-RAY OUTBURSTS FROM THE PECULIAR QUASAR 4C +21.35
journal, April 2011
- Tanaka, Y. T.; Stawarz, Ł.; Thompson, D. J.
- The Astrophysical Journal, Vol. 733, Issue 1
Works referencing / citing this record:
The Connection Between the Radio jet and the Gamma-Ray Emission in the Radio Galaxy 3c 120
journal, July 2015
- Casadio, Carolina; Gómez, José L.; Grandi, Paola
- The Astrophysical Journal, Vol. 808, Issue 2