Gamma-Ray Light Curves And Variability Of Bright Fermi -Detected Blazars
Abstract
This paper presents light curves as well as the first systematic characterization of variability of the 106 objects in the high-confidence Fermi Large Area Telescope Bright AGN Sample (LBAS). Weekly light curves of this sample, obtained during the first 11 months of the Fermi survey (2008 August 4-2009 July 4), are tested for variability and their properties are quantified through autocorrelation function and structure function analysis. For the brightest sources, 3 or 4 day binned light curves are extracted in order to determine power density spectra (PDSs) and to fit the temporal structure of major flares. More than 50% of the sources are found to be variable with high significance, where high states do not exceed 1/4 of the total observation range. Variation amplitudes are larger for flat spectrum radio quasars and low/intermediate synchrotron frequency peaked BL Lac objects. Autocorrelation timescales derived from weekly light curves vary from four to a dozen of weeks. Variable sources of the sample have weekly and 3-4 day bin light curves that can be described by 1/f α PDS, and show two kinds of gamma-ray variability: (1) rather constant baseline with sporadic flaring activity characterized by flatter PDS slopes resembling flickering and red noisemore »
- Authors:
-
- Naval Research Lab. (NRL), Washington, DC (United States); et al.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1357524
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 722; Journal Issue: 1; Journal ID: ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Abdo, A. A. Gamma-Ray Light Curves And Variability Of Bright Fermi -Detected Blazars. United States: N. p., 2010.
Web. doi:10.1088/0004-637X/722/1/520.
Abdo, A. A. Gamma-Ray Light Curves And Variability Of Bright Fermi -Detected Blazars. United States. https://doi.org/10.1088/0004-637X/722/1/520
Abdo, A. A. Wed .
"Gamma-Ray Light Curves And Variability Of Bright Fermi -Detected Blazars". United States. https://doi.org/10.1088/0004-637X/722/1/520. https://www.osti.gov/servlets/purl/1357524.
@article{osti_1357524,
title = {Gamma-Ray Light Curves And Variability Of Bright Fermi -Detected Blazars},
author = {Abdo, A. A.},
abstractNote = {This paper presents light curves as well as the first systematic characterization of variability of the 106 objects in the high-confidence Fermi Large Area Telescope Bright AGN Sample (LBAS). Weekly light curves of this sample, obtained during the first 11 months of the Fermi survey (2008 August 4-2009 July 4), are tested for variability and their properties are quantified through autocorrelation function and structure function analysis. For the brightest sources, 3 or 4 day binned light curves are extracted in order to determine power density spectra (PDSs) and to fit the temporal structure of major flares. More than 50% of the sources are found to be variable with high significance, where high states do not exceed 1/4 of the total observation range. Variation amplitudes are larger for flat spectrum radio quasars and low/intermediate synchrotron frequency peaked BL Lac objects. Autocorrelation timescales derived from weekly light curves vary from four to a dozen of weeks. Variable sources of the sample have weekly and 3-4 day bin light curves that can be described by 1/f α PDS, and show two kinds of gamma-ray variability: (1) rather constant baseline with sporadic flaring activity characterized by flatter PDS slopes resembling flickering and red noise with occasional intermittence and (2)—measured for a few blazars showing strong activity—complex and structured temporal profiles characterized by long-term memory and steeper PDS slopes, reflecting a random walk underlying mechanism. The average slope of the PDS of the brightest 22 FSRQs and of the 6 brightest BL Lacs is 1.5 and 1.7, respectively. The study of temporal profiles of well-resolved flares observed in the 10 brightest LBAS sources shows that they generally have symmetric profiles and that their total duration vary between 10 and 100 days. Results presented here can assist in source class recognition for unidentified sources and can serve as reference for more detailed analysis of the brightest gamma-ray blazars.},
doi = {10.1088/0004-637X/722/1/520},
journal = {The Astrophysical Journal},
number = 1,
volume = 722,
place = {United States},
year = {Wed Sep 22 00:00:00 EDT 2010},
month = {Wed Sep 22 00:00:00 EDT 2010}
}
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Search for Intra-day Optical Variability in γ -Ray-loud Blazars S5 0716+714 and 3C 273
journal, August 2019
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Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014–2018
journal, August 2019
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Statistical Analysis of Microvariability Properties of the Blazar S5 0716+714
journal, October 2019
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Characteristic Variability Timescales in the Gamma-Ray Power Spectra of Blazars
journal, October 2019
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Long-term Variability and Correlation Study of the Blazar 3C 454.3 in the Radio, NIR, and Optical Wavebands
journal, December 2019
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NuSTAR Perspective on High-redshift MeV Blazars
journal, February 2020
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A Decade of Multiwavelength Observations of the TeV Blazar 1ES 1215+303: Extreme Shift of the Synchrotron Peak Frequency and Long-term Optical–Gamma-Ray Flux Increase
journal, March 2020
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Multicolor Optical Monitoring of the Quasar 3C 273 from 2005 to 2016
journal, March 2017
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Multi-TeV Flaring from High-energy Blazars: An Evidence of the Photohadronic Process
journal, October 2019
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Radio-to- γ -ray monitoring of the narrow-line Seyfert 1 galaxy PMN J0948 + 0022 from 2008 to 2011
journal, November 2012
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The F-GAMMA programme: multi-frequency study of active galactic nuclei in the Fermi era : Programme description and the first 2.5 years of monitoring⋆
journal, November 2016
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The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars
journal, June 2016
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Long-term Multiband Study of High-redshift Blazar S5 0836+71
journal, December 2018
- Yang, Jianping; Yang, Chuyuan; Zhou, Bing
- Publications of the Astronomical Society of the Pacific, Vol. 131, Issue 995
Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio
journal, January 2020
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Gamma-ray quasi-periodicities of blazars. A cautious approach
journal, October 2018
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Study on temporal and spectral behaviour of 3C 279 during 2018 January flare
journal, January 2019
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Deviations from normal distributions in artificial and real time series: a false positive prescription
journal, August 2019
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- Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 2
Multiband optical flux density and polarization microvariability study of optically bright blazars
journal, December 2019
- Pasierb, Magdalena; Goyal, Arti; Ostrowski, Michał
- Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 1
Particle diffusion and localized acceleration in inhomogeneous AGN jets – II. Stochastic variation
text, January 2016
- Chen, Xuhui; Pohl, Martin; Böttcher, Markus
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Search for Intra-day Optical Variability in Mrk 501
journal, November 2017
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Statistical Analysis on XMM-Newton X-Ray Flares of Mrk 421: Distributions of Peak Flux and Flaring Time Duration
journal, September 2018
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Quasi-simultaneous Spectroscopic and Multiband Photometric Observations of Blazar S5 0716+714 During 2018–2019
journal, January 2020
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- The Astrophysical Journal, Vol. 888, Issue 1
Long and short term variability of seven blazars in six near-infrared/optical bands
journal, February 2014
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Resolving the High-Energy Universe with Strong Gravitational Lensing: the case of pks 1830–211
journal, August 2015
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Near-infrared and gamma-ray monitoring of TANAMI gamma-ray bright sources
journal, June 2013
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- Astronomy & Astrophysics, Vol. 555
A Decade of Multiwavelength Observations of the TeV Blazar 1ES 1215+303: Extreme Shift of the Synchrotron Peak Frequency and Long-term Optical–Gamma-Ray Flux Increase
text, January 2020
- Valverde, Janeth; Horan, Deirdre; Bernard, Denis
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
NuSTAR perspective on high-redshift MeV blazars
text, January 2020
- Marcotulli, L.; Paliya, Vaidehi Sharan; Ajello, M.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Characterizing the $\gamma$-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT
text, January 2016
- Abdalla, H.; Abramowski, A.; Aharonian, F.
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Location of gamma-ray Flare Emission in the Jet of the BL Lacertae Object OJ287 more than 14pc from the Central Engine
text, January 2010
- Agudo, Ivan; Jorstad, Svetlana G.; Marscher, Alan P.
- arXiv
The radio/gamma-ray connection in Active Galactic Nuclei in the era of the Fermi Large Area Telescope
text, January 2011
- Ackermann, M.; Ajello, M.; Allafort, A.
- arXiv
Multiple periodic oscillations in the radio light curves of NRAO 530
text, January 2012
- Xie, Mingjie; Wang, Junyi; An, Tao
- arXiv
Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011
text, January 2012
- Foschini, L.; Angelakis, E.; Fuhrmann, L.
- arXiv
Long and short term variability of seven blazars in six near-infrared/optical bands
text, January 2013
- Sandrinelli, Angela; Covino, Stefano; Treves, Aldo
- arXiv
Gamma-rays from Blazars and the Extragalactic Background Light
text, January 2013
- Costamante, Luigi
- arXiv
Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars
text, January 2014
- Fuhrmann, L.; Larsson, S.; Chiang, J.
- arXiv
The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
text, January 2015
- Collaboration, Magic; Aleksić, J.; Ansoldi, S.
- arXiv
Resolving the High Energy Universe with Strong Gravitational Lensing: The Case of PKS 1830-211
text, January 2015
- Barnacka, Anna; Geller, Margaret J.; Dell'Antonio, Ian P.
- arXiv
Optical flux behaviour of a sample of Fermi blazars
text, January 2016
- Marchesini, E. J.; Andruchow, I.; Cellone, S. A.
- arXiv
The F-GAMMA program: Multi-frequency study of Active Galactic Nuclei in the Fermi era. Program description and the first 2.5 years of monitoring
text, January 2016
- Fuhrmann, L.; Angelakis, E.; Zensus, J. A.
- arXiv
Extremely rapid x-ray flares of tev blazars in the rxte era
text, January 2017
- Zhu, S. F.; Xue, Y. Q.; Brandt, W. N.
- arXiv
Fermi-LAT Observation of Non-Blazar AGNs
text, January 2018
- Sahakyan, N.; Baghmanyan, V.; Zargaryan, D.
- arXiv
Statistical analysis of variability properties of the Kepler blazar W2R 1926+42
text, January 2018
- Li, Yutong; Hu, Shaoming; Wiita, Paul J.
- arXiv
A Multimessenger Picture of the Flaring Blazar TXS 0506+056: implications for High-Energy Neutrino Emission and Cosmic Ray Acceleration
text, January 2018
- Keivani, A.; Murase, K.; Petropoulou, M.
- arXiv
Fermi-Large Area Telescope observations of the brightest Gamma-ray flare ever detected from CTA 102
text, January 2018
- Prince, Raj; Raman, Gayathri; Hahn, Joachim
- arXiv
Gamma-ray quasi-periodicities of blazars. A cautious approach
text, January 2018
- Covino, Stefano; Sandrinelli, Angela; Treves, Aldo
- arXiv
Multi-frequency variability study of Ton 599 during high activity of 2017
text, January 2018
- Prince, Raj
- arXiv
High energy neutrino flux from individual blazar flares
text, January 2019
- Oikonomou, Foteini; Murase, Kohta; Padovani, Paolo
- arXiv
Multi-TeV flaring from high energy blazars: An evidence of the photohadronic process
text, January 2019
- Sahu, Sarira; Fortin, Carlos E. Lopez; Nagataki, Shigehiro
- arXiv
Long term variability and correlation study of the blazar 3C 454.3 in radio, NIR and optical wavebands
text, January 2019
- Sarkar, A.; Chitnis, V. R.; Gupta, A. C.
- arXiv
Multiband optical flux density and polarization microvariability study of optically bright blazars
text, January 2019
- Pasierb, Magdalena; Goyal, Arti; Ostrowski, Michał
- arXiv
A decade of multi-wavelength observations of the TeV blazar 1ES 1215+303: Extreme shift of the synchrotron peak frequency and long-term optical-gamma-ray flux increase
text, January 2020
- Valverde, Janeth; Horan, Deirdre; Bernard, Denis
- arXiv