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2014A&A...563A..91A - Astronomy and Astrophysics, volume 563A, 91-91 (2014/3-1)

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

ALEKSIC J., ANTONELLI L.A., ANTORANZ P., BABIC A., BARRES DE ALMEIDA U., BARRIO J.A., BECERRA GONZALEZ J., BEDNAREK W., BERGER K., BERNARDINI E., BILAND A., BLANCH O., BOCK R.K., BOLLER A., BONNEFOY S., BONNOLI G., BORLA TRIDON D., BORRACCI F., BRETZ T., CARMONA E., CAROSI A., CARRETO FIDALGO D., COLIN P., COLOMBO E., CONTRERAS J.L., 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 E., FERENC D., FONSECA M.V., FONT L., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GIAVITTO G., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADAMEK A., HADASCH D., HAEFNER D., HERRERO A., HOSE J., HRUPEC D., IDEC W., KADENIUS V., KNOETIG M.L., 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 J.M., 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 J.M., PARTINI S., PERSIC M., PRADA F., PRADA MORONI P.G., PRANDINI E., PREZIUSO S., PULJAK I., REICHARDT I., REINTHAL R., RHODE W., RIBO M., RICO J., RUEGAMER S., SAGGION A., SAITO K., SAITO T.Y., SALVATI M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., 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 D.F., TOYAMA T., TREVES A., UELLENBECK M., VOGLER P., WAGNER R.M., WEITZEL Q., ZANDANEL F., ZANIN R. (The MAGIC Collaboration), DAUSER T., FORTIN P., KADLER M., KRAUSS F., WILBERT S. and WILMS J.

Abstract (from CDS):

The radio galaxy IC310 has recently been identified as a γ-ray emitter based on observations at GeV energies with Fermi-LAT and at very high energies (VHE, E > 100GeV) 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. To understand the nature of IC310 and the origin of the VHE emission, we studied the spectral and flux variability of IC310 from the X-ray band to the VHE γ-ray regime. 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 10-500GeV 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 0.5-10keV band were studied. The VHE light curve reveals several high-amplitude and short-duration flares. Day-to-day flux variability is clearly present (>5σ). The photon index between 120GeV and 8TeV remains at the value Γ∼2.0 during both low and high flux states. The VHE spectral shape does not show significant variability, whereas the flux at 1TeV changes by a factor of ∼7. Fermi-LAT detected only eight γ-ray events in the energy range 10GeV-500GeV in three years of observation. The measured photon index of Γ=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. The rapid variability measured in γ-rays and X-rays confirms the blazar-like behavior of IC310. The multi-TeV γ-ray emission seems to originate from scales of less than 80 Schwarzschild radii (for a black hole mass of 2x108M☉) within the compact core of its FR I radio jet with orientation angle 10°-38°. The spectral energy distribution resembles that of an extreme blazar, albeit the luminosity is more than two orders of magnitude lower.

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Journal keyword(s): galaxies: active - galaxies: individual: IC 310 - gamma rays: galaxies - X-rays: galaxies

Simbad objects: 7

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