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

M. Ackermann; M. Ajello; Jean Ballet; G. Barbiellini; D. Bastieri; R. Bellazzini; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; E. Bottacini; J. Bregeon; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Cutini; F. d'Ammando; F. de Palma; C. D. Dermer; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; R. Dubois; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; P. Fortin; L. Fuhrmann; Y. Fukazawa; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; S. Guiriec; D. Hadasch; M. Hayashida; R. E. Hughes; R. Itoh; G. Jóhannesson; A. S. Johnson; H. Katagiri; J. Kataoka; Jürgen Knödlseder; M. Kuss; J. Lande; S. Larsson; S.-H. Lee; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; M. N. Mazziotta; J. E. Mcenery; J. Mehault; P. F. Michelson; W. Mitthumsiri; T. Mizuno; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; M. Naumann-Godo; S. Nishino; J. P. Norris; E. Nuss; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; M. Ozaki; D. Paneque; J. H. Panetta; V. Pelassa; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; D. Rastawicki; M. Razzano; A. Readhead; A. Reimer; O. Reimer; L. C. Reyes; J. L. Richards; C. Sbarra; C. Sgrò; E. J. Siskind; G. Spandre; P. Spinelli; A. Szostek; H. Takahashi; T. Tanaka; J. G. Thayer; J. B. Thayer; D. J. Thompson; M. Tinivella; D. F. Torres; G. Tosti; E. Troja; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; Z. Yang; S. Zimmer; R. Moderski; K. Nalewajko; M. Sikora; M. Villata; C. M. Raiteri; H. D. Aller; M. F. Aller; A. A. Arkharov; E. Benítez; A. Berdyugin; D.A. Blinov; M. Boettcher; O. J. A. Bravo Calle; C. S. Buemi; D. Carosati; W. P. Chen; C. Diltz; A. Di Paola; M. Dolci; N. V. Efimova; E. Forné; M. A. Gurwell; J. Heidt; D. Hiriart; B. Jordan; G. Kimeridze; T. S. Konstantinova; E. N. Kopatskaya; E. Koptelova; O. M. Kurtanidze; A. Lähteenmäki; E. G. Larionova; L. V. Larionova; V. M. Larionov; P. Leto; E. Lindfors; H. C. Lin; D.A. Morozova; M. G. Nikolashvili; K. Nilsson; M. Oksman; P. Roustazadeh; A. Sievers; L. A. Sigua; A. Sillanpää; T. Takahashi; L. O. Takalo; M. Tornikoski; C. Trigilio; I. S. Troitsky; G. Umana; E. Angelakis; T. P. Krichbaum; I. Nestoras; D. Riquelme; M. Krips; S. Trippe; A. Arai; K. S. Kawabata; K. Sakimoto; M. Sasada; S. Sato; M. Uemura; M. Yamanaka; M. Yoshida; T. Belloni; G. Tagliaferri; E. W. Bonning; J. Isler; C. M. Urry; E. Hoversten; A. Falcone; C. Pagani; M. Stroh

doi:10.1088/0004-637X/751/2/159

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

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

M. Ackermann, M. Ajello, Jean Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, …

The Astrophysical Journal, Vol.751

2012

DOI: https://doi.org/10.1088/0004-637X/751/2/159

Abstract

BL Lacertae objects: individual (AO 0235+164)

galaxies: active

galaxies: jets

gamma rays: galaxies

radiation mechanisms: non-thermal

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 γ-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 γ-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 g. We model the broadband spectra with a leptonic model with external radiation dominated by the infrared emission from the dusty torus.

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Title: MULTI-WAVELENGTH OBSERVATIONS OF BLAZAR AO 0235+164 IN THE 2008-2009 FLARING STATE
Creators - without role: M. Ackermann - Deutsches Elektronen-Synchrotron DESY
M. Ajello - Kavli Institute for Particle Astrophysics and Cosmology
Jean Ballet - Astrophysique, Instrumentation et Modélisation
G. Barbiellini - University of Trieste
D. Bastieri - University of Padua
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
R. D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E. D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A. W. Borgland - Stanford University
E. Bottacini - SLAC National Accelerator Laboratory
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G. A. Caliandro - Institute of Space Sciences
R. A. Cameron - Stanford University
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Université Paris Cité
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
S. Cutini - Agenzia Spaziale Italiana
F. d'Ammando
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
C. D. Dermer - United States Naval Research Laboratory
E. Do Couto E Silva
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
A. Drlica-Wagner - Kavli Institute for Particle Astrophysics and Cosmology
R. Dubois - SLAC National Accelerator Laboratory
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara - Goddard Space Flight Center
W. B. Focke - Stanford University
P. Fortin - Centre National de la Recherche Scientifique
L. Fuhrmann - Max Planck Institute for Radio Astronomy
Y. Fukazawa - Hiroshima University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
N. Giglietto - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P. Giommi - Agenzia Spaziale Italiana
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - CEA Paris-Saclay
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institute of Space Sciences
M. Hayashida - Kyoto University
R. E. Hughes - The Ohio State University
R. Itoh - Hiroshima University
G. Jóhannesson - University of Iceland
A. S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Ibaraki University
J. Kataoka - Waseda University
Jürgen Knödlseder - Institut de Recherche en Astrophysique et Planétologie
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - Stockholm University
S.-H. Lee - Kyoto University
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
B. Lott - Laboratoire de Physique des deux infinis Bordeaux
M. N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
G. M. Madejski - Kavli Institute for Particle Astrophysics and Cosmology
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J. E. Mcenery - University of Maryland, College Park
J. Mehault - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
P. F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
C. Monte - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko - Stanford University
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
M. Naumann-Godo - CEA Paris-Saclay
S. Nishino - Hiroshima University
J. P. Norris - Boise State University
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
A. Okumura - Stanford University
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Max Planck Institute for Extraterrestrial Physics
M. Ozaki - Institute of Space and Astronautical Science
D. Paneque - Max Planck Institute for Physics
J. H. Panetta - Stanford University
V. Pelassa - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Pierbattista - Astrophysique, Instrumentation et Modélisation
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
T. A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Rainò - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Rando - University of Padua
D. Rastawicki - Kavli Institute for Particle Astrophysics and Cosmology
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Readhead
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
L. C. Reyes - California Polytechnic State University
J. L. Richards - California Institute of Technology
C. Sbarra - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind - Real Time Tomography
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
A. Szostek - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - Hiroshima University
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
J. G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J. B. Thayer - Stanford University
D. J. Thompson - Goddard Space Flight Center
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D. F. Torres - Institució Catalana de Recerca i Estudis Avançats
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
E. Troja - Goddard Space Flight Center
T. L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Consorzio Interuniversitario Fisica Spaziale
V. Vitale - University of Rome Tor Vergata
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
B. L. Winer - The Ohio State University
K. S. Wood - United States Naval Research Laboratory
Z. Yang - AlbaNova
S. Zimmer - AlbaNova
R. Moderski - Nicolaus Copernicus Astronomical Center
K. Nalewajko - Nicolaus Copernicus Astronomical Center
M. Sikora - Nicolaus Copernicus Astronomical Center
M. Villata - Osservatorio Astrofisico di Torino
C. M. Raiteri - Osservatorio Astrofisico di Torino
H. D. Aller - University of Michigan–Ann Arbor
M. F. Aller - University of Michigan–Ann Arbor
A. A. Arkharov - Pulkovo Observatory
E. Benítez - Universidad Nacional Autónoma de México
A. Berdyugin - University of Turku
D.A. Blinov - Pulkovo Observatory
M. Boettcher - Ohio University
O. J. A. Bravo Calle
C. S. Buemi
D. Carosati - Telescopio Nazionale Galileo
W. P. Chen
C. Diltz - Ohio University
A. Di Paola - Astronomical Observatory of Rome
M. Dolci - Collurania Teramo Observatory
N. V. Efimova
E. Forné
M. A. Gurwell
J. Heidt - Heidelberg University
D. Hiriart - Universidad Nacional Autónoma de México
B. Jordan - Dublin Institute For Advanced Studies
G. Kimeridze - Abastumani Astrophysical Observatory
T. S. Konstantinova
E. N. Kopatskaya
E. Koptelova - National Central University
O. M. Kurtanidze
A. Lähteenmäki - Aalto University
E. G. Larionova
L. V. Larionova
V. M. Larionov
P. Leto - Osservatorio Astrofisico di Catania
E. Lindfors - University of Turku
H. C. Lin
D.A. Morozova - Institute of Applied Astronomy
M. G. Nikolashvili
K. Nilsson - University of Turku
M. Oksman - Aalto University
P. Roustazadeh - Ohio University
A. Sievers - Instituto de Radioastronomía Milimétrica
L. A. Sigua
A. Sillanpää - University of Turku
T. Takahashi - Institute of Space and Astronautical Science
L. O. Takalo
M. Tornikoski - Aalto University
C. Trigilio - Osservatorio Astrofisico di Catania
I. S. Troitsky
G. Umana - Osservatorio Astrofisico di Catania
E. Angelakis - Max Planck Institute for Radio Astronomy
T. P. Krichbaum
I. Nestoras - Max Planck Institute for Radio Astronomy
D. Riquelme - Instituto de Radioastronomía Milimétrica
M. Krips - Institut de Radioastronomie Millimétrique
S. Trippe - Seoul National University
A. Arai - Kyoto University
K. S. Kawabata
K. Sakimoto - Hiroshima University
M. Sasada - Hiroshima University
S. Sato - Nagoya University
M. Uemura - Hiroshima University
M. Yamanaka - Hiroshima University
M. Yoshida - Hiroshima University
T. Belloni - Brera Astronomical Observatory
G. Tagliaferri - Brera Astronomical Observatory
E. W. Bonning
J. Isler - Yale University
C. M. Urry
E. Hoversten - Pennsylvania State University
A. Falcone - Pennsylvania State University
C. Pagani - University of Leicester
M. Stroh - Pennsylvania State University
Publication Details: The Astrophysical Journal, Vol.751
Identifiers: 9938476109311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00769591