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Title: 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 » 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.« less

Authors:
 [1]
  1. 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 = {2010},
month = {9}
}

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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


The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars
journal, June 2016


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
  • DOI: 10.1088/1538-3873/aaeae6

Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio
journal, January 2020

  • Larionov, V. M.; Jorstad, S. G.; Marscher, A. P.
  • Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 3
  • DOI: 10.1093/mnras/staa082

Gamma-ray quasi-periodicities of blazars. A cautious approach
journal, October 2018

  • Covino, S.; Sandrinelli, A.; Treves, A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 1
  • DOI: 10.1093/mnras/sty2720

Study on temporal and spectral behaviour of 3C 279 during 2018 January flare
journal, January 2019

  • Shah, Zahir; Jithesh, V.; Sahayanathan, S.
  • Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 3
  • DOI: 10.1093/mnras/stz151

Deviations from normal distributions in artificial and real time series: a false positive prescription
journal, August 2019

  • Morris, Paul J.; Chakraborty, Nachiketa; Cotter, Garret
  • Monthly Notices of the Royal Astronomical Society, Vol. 489, Issue 2
  • DOI: 10.1093/mnras/stz2259

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
  • DOI: 10.1093/mnras/stz3533

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
  • DOI: 10.3204/pubdb-2017-00196

Search for Intra-day Optical Variability in Mrk 501
journal, November 2017


Statistical Analysis on XMM-Newton X-Ray Flares of Mrk 421: Distributions of Peak Flux and Flaring Time Duration
journal, September 2018


Quasi-simultaneous Spectroscopic and Multiband Photometric Observations of Blazar S5 0716+714 During 2018–2019
journal, January 2020


Long and short term variability of seven blazars in six near-infrared/optical bands
journal, February 2014


Resolving the High-Energy Universe with Strong Gravitational Lensing: the case of pks 1830–211
journal, August 2015

  • Barnacka, Anna; Geller, Margaret J.; Dell’Antonio, Ian P.
  • The Astrophysical Journal, Vol. 809, Issue 1
  • DOI: 10.1088/0004-637x/809/1/100

Near-infrared and gamma-ray monitoring of TANAMI gamma-ray bright sources
journal, June 2013


NuSTAR perspective on high-redshift MeV blazars
text, January 2020

  • Marcotulli, L.; Paliya, Vaidehi Sharan; Ajello, M.
  • Deutsches Elektronen-Synchrotron, DESY, Hamburg
  • DOI: 10.3204/pubdb-2021-00238

Evidence for two Lognormal States in Multi-Wavelength flux Variation of fsrq pks 1510-089
journal, April 2016


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
  • DOI: 10.3204/pubdb-2017-00447