Rapid and multi-band variability of the TeV-bright active nucleus of the galaxy IC 310

Дата и время публикации : 2013-05-22T14:27:32Z

Авторы публикации и институты :
The MAGIC Collaboration
J. Aleksić (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
L. A. Antonelli (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
P. Antoranz (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
A. Babic (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
U. Barres de Almeida (Max-Planck-Institut für Physik, D-80805 München, Germany)
J. A. Barrio (Universidad Complutense, E-28040 Madrid, Spain)
J. Becerra González (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
W. Bednarek (University of Łódź, PL-90236 Lodz, Poland)
K. Berger (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, Depto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain)
E. Bernardini (Deutsches Elektronen-Synchrotron)
A. Biland (ETH Zurich, CH-8093 Zurich, Switzerland)
O. Blanch (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
R. K. Bock (Max-Planck-Institut für Physik, D-80805 München, Germany)
A. Boller (ETH Zurich, CH-8093 Zurich, Switzerland)
S. Bonnefoy (Universidad Complutense, E-28040 Madrid, Spain)
G. Bonnoli (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
D. Borla Tridon (Max-Planck-Institut für Physik, D-80805 München, Germany)
F. Borracci (Max-Planck-Institut für Physik, D-80805 München, Germany)
T. Bretz (Universität Würzburg, D-97074 Würzburg, Germany, now at: Ecole polytechnique fédérale de Lausanne)
E. Carmona (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, E-28040 Madrid, Spain)
A. Carosi (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
D. Carreto Fidalgo (Universität Würzburg, D-97074 Würzburg, Germany, Universidad Complutense, E-28040 Madrid, Spain)
P. Colin (Max-Planck-Institut für Physik, D-80805 München, Germany)
E. Colombo (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
J. L. Contreras (Universidad Complutense, E-28040 Madrid, Spain)
J. Cortina (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
L. Cossio (Università di Udine, and INFN Trieste, I-33100 Udine, Italy)
S. Covino (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
P. Da Vela (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
F. Dazzi (Università di Udine, and INFN Trieste, I-33100 Udine, Italy, supported by INFN Padova)
A. De Angelis (Università di Udine, and INFN Trieste, I-33100 Udine, Italy)
G. De Caneva (Deutsches Elektronen-Synchrotron)
C. Delgado Mendez (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, E-28040 Madrid, Spain)
B. De Lotto (Università di Udine, and INFN Trieste, I-33100 Udine, Italy)
M. Doert (Technische Universität Dortmund, D-44221 Dortmund, Germany)
A. Domínguez (Inst. de Astrofísica de Andalucía, now at: Department of Physics & Astronomy, UC Riverside, CA 92521, USA)
D. Dominis Prester (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
D. Dorner (Universität Würzburg, D-97074 Würzburg, Germany)
M. Doro (Università di Padova and INFN, I-35131 Padova, Italy, Unitat de Física de les Radiacions, Departament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain)
D. Eisenacher (Universität Würzburg, D-97074 Würzburg, Germany)
D. Elsaesser (Universität Würzburg, D-97074 Würzburg, Germany)
E. Farina (Università dell’Insubria, Como, I-22100 Como, Italy)
D. Ferenc (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
M. V. Fonseca (Universidad Complutense, E-28040 Madrid, Spain)
L. Font (Unitat de Física de les Radiacions, Departament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain)
C. Fruck (Max-Planck-Institut für Physik, D-80805 München, Germany)
R. J. García López (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, Depto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain)
M. Garczarczyk (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
D. Garrido Terrats (Unitat de Física de les Radiacions, Departament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain)
M. Gaug (Unitat de Física de les Radiacions, Departament de Física, and CERES-IEEC, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain)
G. Giavitto (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
N. Godinović (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
A. González Muñoz (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
S. R. Gozzini (Deutsches Elektronen-Synchrotron)
A. Hadamek (Technische Universität Dortmund, D-44221 Dortmund, Germany)
D. Hadasch (Institut de Ciències de l’Espai)
D. Häfner (Max-Planck-Institut für Physik, D-80805 München, Germany)
A. Herrero (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, Depto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain)
J. Hose (Max-Planck-Institut für Physik, D-80805 München, Germany)
D. Hrupec (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
W. Idec (University of Łódź, PL-90236 Lodz, Poland)
V. Kadenius (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland)
M. L. Knoetig (Max-Planck-Institut für Physik, D-80805 München, Germany)
T. Krähenbühl (ETH Zurich, CH-8093 Zurich, Switzerland)
J. Krause (Max-Planck-Institut für Physik, D-80805 München, Germany)
J. Kushida (Japanese MAGIC Consortium, Division of Physics and Astronomy, Kyoto University, Japan)
A. La Barbera (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
D. Lelas (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
N. Lewandowska (Universität Würzburg, D-97074 Würzburg, Germany)
E. Lindfors (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, now at: Finnish Centre for Astronomy with ESO)
S. Lombardi (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
R. López-Coto (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
M. López (Universidad Complutense, E-28040 Madrid, Spain)
A. López-Oramas (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
E. Lorenz (Max-Planck-Institut für Physik, D-80805 München, Germany, ETH Zurich, CH-8093 Zurich, Switzerland)
I. Lozano (Universidad Complutense, E-28040 Madrid, Spain)
M. Makariev (Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
K. Mallot (Deutsches Elektronen-Synchrotron)
G. Maneva (Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
N. Mankuzhiyil (Università di Udine, and INFN Trieste, I-33100 Udine, Italy)
K. Mannheim (Universität Würzburg, D-97074 Würzburg, Germany)
L. Maraschi (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
B. Marcote (Universitat de Barcelona)
M. Mariotti (Università di Padova and INFN, I-35131 Padova, Italy)
M. Martínez (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
J. Masbou (Università di Padova and INFN, I-35131 Padova, Italy)
D. Mazin (Max-Planck-Institut für Physik, D-80805 München, Germany)
M. Meucci (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
J. M. Miranda (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
R. Mirzoyan (Max-Planck-Institut für Physik, D-80805 München, Germany)
J. Moldón (Universitat de Barcelona)
A. Moralejo (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
P. Munar-Adrover (Universitat de Barcelona)
D. Nakajima (Max-Planck-Institut für Physik, D-80805 München, Germany)
A. Niedzwiecki (University of Łódź, PL-90236 Lodz, Poland)
K. Nilsson (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland, now at: Finnish Centre for Astronomy with ESO)
N. Nowak (Max-Planck-Institut für Physik, D-80805 München, Germany)
R. Orito (Japanese MAGIC Consortium, Division of Physics and Astronomy, Kyoto University, Japan)
A. Overkemping (Technische Universität Dortmund, D-44221 Dortmund, Germany)
S. Paiano (Università di Padova and INFN, I-35131 Padova, Italy)
M. Palatiello (Università di Udine, and INFN Trieste, I-33100 Udine, Italy)
D. Paneque (Max-Planck-Institut für Physik, D-80805 München, Germany)
R. Paoletti (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
J. M. Paredes (Universitat de Barcelona)
S. Partini (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
M. Persic (Università di Udine, and INFN Trieste, I-33100 Udine, Italy, INAF/Osservatorio Astronomico and INFN, I-34143 Trieste, Italy)
F. Prada (Inst. de Astrofísica de Andalucía, also at Instituto de Fisica Teorica, UAM/CSIC, E-28049 Madrid, Spain)
P. G. Prada Moroni (Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy)
E. Prandini (Università di Padova and INFN, I-35131 Padova, Italy)
S. Preziuso (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
I. Puljak (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
I. Reichardt (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
R. Reinthal (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland)
W. Rhode (Technische Universität Dortmund, D-44221 Dortmund, Germany)
M. Ribó (Universitat de Barcelona)
J. Rico (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
S. Rügamer (Universität Würzburg, D-97074 Würzburg, Germany)
A. Saggion (Università di Padova and INFN, I-35131 Padova, Italy)
K. Saito (Japanese MAGIC Consortium, Division of Physics and Astronomy, Kyoto University, Japan)
T. Y. Saito (Max-Planck-Institut für Physik, D-80805 München, Germany)
M. Salvati (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
K. Satalecka (Universidad Complutense, E-28040 Madrid, Spain)
V. Scalzotto (Università di Padova and INFN, I-35131 Padova, Italy)
V. Scapin (Universidad Complutense, E-28040 Madrid, Spain)
C. Schultz (Università di Padova and INFN, I-35131 Padova, Italy)
T. Schweizer (Max-Planck-Institut für Physik, D-80805 München, Germany)
S. N. Shore (Università di Pisa, and INFN Pisa, I-56126 Pisa, Italy)
A. Sillanpää (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland)
J. Sitarek (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
I. Snidaric (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
D. Sobczynska (University of Łódź, PL-90236 Lodz, Poland)
F. Spanier (Universität Würzburg, D-97074 Würzburg, Germany)
S. Spiro (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
V. Stamatescu (IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
A. Stamerra (Università di Siena, and INFN Pisa, I-53100 Siena, Italy)
B. Steinke (Max-Planck-Institut für Physik, D-80805 München, Germany)
J. Storz (Universität Würzburg, D-97074 Würzburg, Germany)
S. Sun (Max-Planck-Institut für Physik, D-80805 München, Germany)
T. Surić (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
L. Takalo (Tuorla Observatory, University of Turku, FI-21500 Piikkiö, Finland)
H. Takami (Japanese MAGIC Consortium, Division of Physics and Astronomy, Kyoto University, Japan)
F. Tavecchio (INAF National Institute for Astrophysics, I-00136 Rome, Italy)
P. Temnikov (Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
T. Terzić (Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
D. Tescaro (Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain, Depto. de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain)
M. Teshima (Max-Planck-Institut für Physik, D-80805 München, Germany)
J. Thaele (Technische Universität Dortmund, D-44221 Dortmund, Germany)
O. Tibolla (Universität Würzburg, D-97074 Würzburg, Germany)
D. F. Torres (ICREA, E-08010 Barcelona, Spain, Institut de Ciències de l’Espai)
T. Toyama (Max-Planck-Institut für Physik, D-80805 München, Germany)
A. Treves (Università dell’Insubria, Como, I-22100 Como, Italy)
M. Uellenbeck (Technische Universität Dortmund, D-44221 Dortmund, Germany)
P. Vogler (ETH Zurich, CH-8093 Zurich, Switzerland)
R. M. Wagner (Max-Planck-Institut für Physik, D-80805 München, Germany)
Q. Weitzel (ETH Zurich, CH-8093 Zurich, Switzerland)
F. Zandanel (Inst. de Astrofísica de Andalucía, now at: GRAPPA Institute, University of Amsterdam, 1098XH Amsterdam, Netherlands))
R. Zanin (Universitat de Barcelona)
T. Dauser (Dr-Karl-Remeis-Observatory and Erlangen Centre for Astroparticle Physics, 96049 Bamberg, Germany)
P. Fortin (Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, USA)
M. Kadler (Dr-Karl-Remeis-Observatory and Erlangen Centre for Astroparticle Physics, 96049 Bamberg, Germany)
F. Krauß (Dr-Karl-Remeis-Observatory and Erlangen Centre for Astroparticle Physics, 96049 Bamberg, Germany)
S. Wilbert (Universität Würzburg, D-97074 Würzburg, Germany)
J. Wilms (Dr-Karl-Remeis-Observatory and Erlangen Centre for Astroparticle Physics, 96049 Bamberg, Germany)
Dr-Karl-Remeis-Observatory
Erlangen Centre for Astroparticle Physics
96049 Bamberg
Germany
Fred Lawrence Whipple Observatory
Harvard-Smithsonian Center for Astrophysics
Amado
AZ 85645
USA)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 5 figures, 4 tables, submitted to A&A
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: Context. The galaxy IC 310 has recently been identified as a $gamma$-ray emitter by the Fermi-LAT and at very high energies by the MAGIC telescopes. Originally classified as a head-tail radio galaxy, the nature of this object is subject of controversy because its nucleus shows blazar-like behavior. Aims. In order to understand the nature of IC 310 and the origin of the VHE emission we studied the spectral and flux variability of IC 310 from the X-ray band to the VHE regime. Methods. The daily light curve of IC 310 above 300 GeV has been measured with MAGIC from 2009 October to 2010 February. Contemporaneous Fermi-LAT data (2008-2011) in the 10-500 GeV energy range were also analyzed. In X-ray, archival observations from 2003 to 2007 with XMM-Newton, Chandra, and Swift-XRT in the 0.5-10 keV band were studied. Results. Several flares with similar amplitude can be seen in the MAGIC light curve. Day to day flux variability is clearly present. The photon index between 120 GeV and 8 TeV is measured to be $Gamma=2.0$ during both low and high flux states. It does not show variability, whereas the flux at 1 TeV changes by a factor of 7. Fermi-LAT detected only eight $gamma$ rays in the energy range 10 GeV-500 GeV in three years of observation. The measured photon index of $Gamma=1.3pm0.5$ in the Fermi-LAT range is very hard. The X-ray measurements show strong variability in both flux and photon index. The latter varied from 1.76 to 2.55. Conclusion. The rapid variability measured in $gamma$ rays and X-rays confirms the blazar-like behavior of the source. The spectral behavior measured in both energy bands suggest IC 310 could be linked to extreme HBL objects. The apparent luminosity of IC 310 is a few orders of magnitude lower than other extreme HBLs however and, atypical for an HBL, it harbors a kiloparsec-scale radio structure. Thus, IC 310 could be a peculiar type of a HBL.

Category: Physics