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MULTI-WAVELENGTH OBSERVATIONS OF BLAZAR AO 0235+164 IN THE 2008-2009 FLARING STATE

Journal Article · · Astrophysical Journal
 [1]; ; ; ; ; ; ;  [2]; ;  [3];  [4]; ;  [5]; ;  [6];  [7];  [8];  [9];  [10]; more »; ; ; ; ; ; ; « less
  1. Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany)
  2. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  3. Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
  4. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
  6. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
  7. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
  8. Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy)
  9. Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France)
  10. Institut de Ciencies de l'Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona (Spain)
+ Show Author Affiliations
The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuous coverage by Fermi, contemporaneous observations were carried out from the radio to {gamma}-ray bands between 2008 September and 2009 February. In this paper, we summarize the rich multi-wavelength data collected during the campaign (including F-GAMMA, GASP-WEBT, Kanata, OVRO, RXTE, SMARTS, Swift, and other instruments), examine the cross-correlation between the light curves measured in the different energy bands, and interpret the resulting spectral energy distributions in the context of well-known blazar emission models. We find that the {gamma}-ray activity is well correlated with a series of near-IR/optical flares, accompanied by an increase in the optical polarization degree. On the other hand, the X-ray light curve shows a distinct 20 day high state of unusually soft spectrum, which does not match the extrapolation of the optical/UV synchrotron spectrum. We tentatively interpret this feature as the bulk Compton emission by cold electrons contained in the jet, which requires an accretion disk corona with an effective covering factor of 19% at a distance of 100 R{sub g}. We model the broadband spectra with a leptonic model with external radiation dominated by the infrared emission from the dusty torus.
OSTI ID:
22037142
Journal Information:
Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 751; ISSN ASJOAB; ISSN 0004-637X
Country of Publication:
United States
Language:
English

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The extreme blazar AO 0235+164 as seen by extensive ground and space radio observations text January 2018
Variability and Period Analysis for BL Lac AO 0235+164 journal March 2017
High energy neutrino flux from individual blazar flares text January 2019
High-energy neutrino flux from individual blazar flares journal September 2019
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
Constraining the Physical Conditions in the Jets of Gamma-Ray Flaring Blazars using Centimeter-Band Polarimetry and Radiative Transfer Simulations. I. Data and Models for 0420-014, OJ 287, and 1156+295 text January 2014
Long-term Multiband Study of High-redshift Blazar S5 0836+71 journal December 2018
The γ -ray emitting region in low synchrotron peak blazars: Testing self-synchrotron Compton and external Compton scenarios journal August 2018
Physical characteristics of the Blazar AO 0235+164 journal February 2015
High energy emission processes in OJ 287 during 2009 flare journal June 2013
THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY ( NuSTAR ) HIGH-ENERGY X-RAY MISSION journal May 2013
Comprehensive Monitoring of Gamma-Ray Bright Blazars. i. Statistical Study of Optical, X-Ray, and Gamma-Ray Spectral Slopes journal June 2014
Constraining the Location of Gamma-Ray Flares in Luminous Blazars journal June 2014
Constraining the Physical Conditions in the jets of γ-Ray Flaring Blazars Using Centimeter-Band Polarimetry and Radiative Transfer Simulations. i. data and Models for 0420–014, oj 287, and 1156+295 journal July 2014
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
Constraining the Location of Gamma-Ray Flares in Luminous Blazars text January 2014

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCRETION DISKS
ASTRONOMY
ASTROPHYSICS
BL LACERTAE OBJECTS
CORRELATIONS
COSMIC ELECTRONS
DIAGRAMS
ENERGY SPECTRA
GALAXIES
GAMMA RADIATION
INFRARED SPECTRA
JETS
NEAR INFRARED RADIATION
PHOTON EMISSION
POLARIZATION
STELLAR FLARES
VISIBLE RADIATION
X RADIATION