First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310
Abstract
The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are known so far to emit above 100 GeV. Multi-wavelength studies of such objects up to the highest energies provide new insights into the particle and radiation processes of active galactic nuclei. We report the results from the first multi-wavelength campaign observing the TeV detected nucleus of the active galaxy IC 310, whose jet is observed at a moderate viewing angle of 10 deg - 20 deg. The multi-instrument campaign was conducted between 2012 Nov. and 2013 Jan., and involved observations with MAGIC, Fermi, INTEGRAL, Swift, OVRO, MOJAVE and EVN. These observations were complemented with archival data from the AllWISE and 2MASS catalogs. A one-zone synchrotron self-Compton model was applied to describe the broad-band spectral energy distribution. IC 310 showed an extraordinary TeV flare at the beginning of the campaign, followed by a low, but still detectable TeV flux. Compared to previous measurements, the spectral shape was found to be steeper during the low emission state. Simultaneous observations in the soft X-ray band showed an enhanced energy flux state and a harder-when-brighter spectral shape behaviour. No strong correlated flux variability was found in other frequency regimes. The broad-band spectral energy distribution obtained from these observations supports the hypothesis of a double-hump structure. The harder-when-brighter trend in the X-ray and VHE emission is consistent with the behaviour expected from a synchrotron self-Compton scenario. The contemporaneous broad-band spectral energy distribution is well described with a one-zone synchrotron self-Compton model using parameters that are comparable to those found for other gamma-ray-emitting misaligned blazars.
Keywords
Cite
@article{arxiv.1703.07651,
title = {First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310},
author = {M. L. Ahnen and S. Ansoldi and L. A. Antonelli and C. Arcaro and A. Babić and B. Banerjee and P. Bangale and U. Barres de Almeida and J. A. Barrio and J. Becerra González and W. Bednarek and E. Bernardini and A. Berti and B. Biasuzzi and A. Biland and O. Blanch and S. Bonnefoy and G. Bonnoli and F. Borracci and T. Bretz and R. Carosi and A. Carosi and A. Chatterjee and P. Colin and E. Colombo and J. L. Contreras and J. Cortina and S. Covino and P. Cumani and P. Da Vela and F. Dazzi and A. De Angelis and B. De Lotto and E. de Oña Wilhelmi and F. Di Pierro and M. Doert and A. Domínguez and D. Dominis Prester and D. Dorner and M. Doro and S. Einecke and D. Eisenacher Glawion and D. Elsaesser and M. Engelkemeier and V. Fallah Ramazani and A. Fernández-Barral and D. Fidalgo and M. V. Fonseca and L. Font and C. Fruck and D. Galindo and R. J. García López and M. Garczarczyk and M. Gaug and P. Giammaria and N. Godinović and D. Gora and D. Guberman and D. Hadasch and A. Hahn and T. Hassan and M. Hayashida and J. Herrera and J. Hose and D. Hrupec and G. Hughes and W. Idec and K. Ishio and K. Kodani and Y. Konno and H. Kubo and J. Kushida and D. Lelas and E. Lindfors and S. Lombardi and F. Longo and M. López and P. Majumdar and M. Makariev and K. Mallot and G. Maneva and M. Manganaro and K. Mannheim and L. Maraschi and M. Mariotti and M. Martínez and D. Mazin and U. Menzel and R. Mirzoyan and A. Moralejo and E. Moretti and D. Nakajima and V. Neustroev and A. Niedzwiecki and M. Nievas Rosillo and K. Nilsson and K. Nishijima and K. Noda and L. Nogués and M. Nöthe and S. Paiano and J. Palacio and D. Paneque and R. Paoletti and J. M. Paredes and X. Paredes-Fortuny and G. Pedaletti and M. Peresano and L. Perri and M. Persic and J. Poutanen and P. G. Prada Moroni and E. Prandini and I. Puljak and J. R. Garcia and I. Reichardt and W. Rhode and M. Ribó and J. Rico and T. Saito and K. Satalecka and S. Schroeder and T. Schweizer and S. N. Shore and A. Sillanpää and J. Sitarek and I. Šnidarić and D. Sobczynska and A. Stamerra and M. Strzys and T. Surić and L. Takalo and F. Tavecchio and P. Temnikov and T. Terzić and D. Tescaro and M. Teshima and D. F. Torres and N. Torres-Albà and T. Toyama and A. Treves and G. Vanzo and M. Vazquez Acosta and I. Vovk and J. E. Ward and M. Will and M. H. Wu and F. Krauß and R. Schulz and M. Kadler and J. Wilms and E. Ros and U. Bach and T. Beuchert and M. Langejahn and C. Wendel and N. Gehrels and W. H. Baumgartner and C. B. Markwardt and C. Müller and V. Grinberg and T. Hovatta and J. Magill},
journal= {arXiv preprint arXiv:1703.07651},
year = {2020}
}
Comments
15 pages, 10 figures. Accepted for publication in A&A