Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310

Journal article


Publication Details

Author(s): Aleksie J, Antonelli LA, Antoranz P, Babic A, De Almeida UB, Barrio JA, Becerra Gonzalez J, Bednarek W, Berger K, Bernardini E, Biland A, Blanch O, Bock RK, Boller A, Bonnefoy S, Bonnoli G, Tridon DB, Borracci F, Bretz T, Carmona E, Carosi A, Carreto Fidalgo D, Colin P, Colombo E, Contreras JL, Cortina J, Cossio L, Covino S, Da Vela P, Dazzi F, De Angelis A, De Caneva G, Delgado Mendez C, De Lotto B, Doert M, Dominguez A, Dominis Prester D, Dorner D, Doro M, Eisenacher D, Elsaesser D, Farina EP, Ferenc D, Fonseca MV, Font L, Fruck C, Garcia Lopez RJ, Garczarczyk M, Terrats DG, Gaug M, Giavitto G, Godinovic N, Gonzalez Munoz A, Gozzini SR, Hadamek A, Hadasch D, Haefner D, Herrero A, Hose J, Hrupec D, Idec W, Kadenius V, Knoetig ML, Kraehenbuehl T, Krause J, Kushida J, La Barbera A, Lelas D, Lewandowska N, Lindfors E, Lombardi S, Lopez-Coto R, Lopez M, Lopez-Oramas A, Lorenz E, Lozano I, Makariev M, Mallot K, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Marcote B, Mariotti M, Martinez M, Masbou J, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Moldon J, Moralejo A, Munar-Adrover P, Nakajima D, Niedzwiecki A, Nilsson K, Nowak N, Orito R, Overkemping A, Paiano S, Palatiello M, Paneque D, Paoletti R, Paredes JM, Partini S, Persic M, Prada F, Pradamoroni PG, Prandini E, Preziuso S, Puljak I, Reichardt I, Reinthal R, Rhode W, Ribo M, Rico J, Ruegamer S, Saggion A, Saito K, Saito TY, Salvati M, Satalecka K, Scalzotto V, Scapin V, Schultz C, Schweizer T, Shore SN, Sillanpaeae A, Sitarek J, Snidaric I, Sobczynska D, Spanier F, Spiro S, Stamatescu V, Stamerra A, Steinke B, Storz J, Sun S, Suric T, Takalo L, Takami H, Tavecchio F, Temnikov P, Terzic T, Tescaro D, Teshima M, Thaele J, Tibolla O, Torres DF, Toyama T, Treves A, Uellenbeck M, Vogler P, Wagner RM, Weitzel Q, Zandanel F, Zanin R, Dauser T, Fortin P, Kadler M, Krauss F, Wilbert S, Wilms J
Journal: Astronomy & Astrophysics
Publisher: EDP SCIENCES S A
Publication year: 2014
Volume: 563
ISSN: 1432-0746


Abstract

Context. The radio galaxy IC 310 has recently been identified as a gamma-ray emitter based on observations at GeV energies with Fermi-LAT and at very high energies (VHE, E > 100 GeV) with the MAGIC telescopes. Originally classified as a head-tail radio galaxy, the nature of this object is subject of controversy since its nucleus shows blazar-like behavior.Aims. To understand the nature of IC310 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 gamma-ray regime.Methods. The light curve of IC310 above 300GeV has been measured with the MAGIC telescopes from 2009 October to 2010 February. Contemporaneous Fermi-LAT data (2008-2011) in the 10-500 GeV energy range were also analyzed. In the X-ray regime, archival observations from 2003 to 2007 with XMM-Newton, Chandra, and Swift-XRT in the 0.5-10 keV band were studied.Results. The VHE light curve reveals several high-amplitude and short-duration flares. Day-to-day flux variability is clearly present (>5 sigma). The photon index between 120 GeV and 8 TeV remains at the value Gamma similar to 2.0 during both low and high flux states. The VHE spectral shape does not show significant variability, whereas the flux at 1 TeV changes by a factor of similar to 7. Fermi-LAT detected only eight gamma-ray events in the energy range 10 GeV-500 GeV in three years of observation. The measured photon index of Gamma = 1.3 +/- 0.5 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 +/- 0.07 to 2.55 +/- 0.07.Conclusions. The rapid variability measured in gamma-rays and X-rays confirms the blazar-like behavior of IC310. The multi-TeV gamma-ray emission seems to originate from scales of less than 80 Schwarzschild radii (for a black hole mass of 2 x 10(8) M-circle dot) within the compact core of its FR I radio jet with orientation angle 10 degrees-38 degrees. The spectral energy distribution resembles that of an extreme blazar, albeit the luminosity is more than two orders of magnitude lower.


FAU Authors / FAU Editors

Dauser, Thomas Dr.
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Wilms, Jörn Prof. Dr.
Professur für Astronomie und Astrophysik


External institutions with authors

Autonomous University of Barcelona (UAB) / Universitat Autònoma de Barcelona
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
Deutsches Elektronen-Synchrotron DESY
École Polytechnique Fédérale de Lausanne (EPFL)
Harvard University
Institut de Fisica d'Altes Energies (IFAE) / The Institute for High Energy Physics
Institut d'Estudis Espacials de Catalunya (IEEC)
Institute for Nuclear Researches and Nuclear Energy (INRNE) / Институт за ядрени изследвания и ядрена енергетика (ИЯИЯЕ)
Institute of Astrophysics of Andalusia / Instituto de Astrofísica de Andalucía (IAA-CSIC)
Instituto de Astrofísica de Canarias (IAC)
Julius-Maximilians-Universität Würzburg
Kyoto University / 京都大学 Kyōto daigaku
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut, MPP) / Max Planck Institute for Physics
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Sveučilište u Rijeci / University of Rijeka
Technische Universität Dortmund
Universidad Complutense de Madrid (UCM)
Università degli Studi di Siena (UNISI) / University of Siena
Universitat de Barcelona (UB) / University of Barcelona
University of Insubria / Università degli Studi dell'Insubria
University of Lodz / Uniwersytet Łódzki
University of Padua
University of Pisa / Università di Pisa (UniPi)
University of Turku / Turun yliopisto
University of Udine / Università degli Studi di Udine


How to cite

APA:
Aleksie, J., Antonelli, L.A., Antoranz, P., Babic, A., De Almeida, U.B., Barrio, J.A.,... Wilms, J. (2014). Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310. Astronomy & Astrophysics, 563. https://dx.doi.org/10.1051/0004-6361/201321938

MLA:
Aleksie, J., et al. "Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310." Astronomy & Astrophysics 563 (2014).

BibTeX: 

Last updated on 2019-13-06 at 02:08