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http://hdl.handle.net/2445/58575
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DC Field | Value | Language |
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dc.contributor.author | MAGIC Collaboration | - |
dc.contributor.author | Marcote Martin, Benito | - |
dc.contributor.author | Moldón Vara, Francisco Javier | - |
dc.contributor.author | Munar i Adrover, Pere | - |
dc.contributor.author | Paredes i Poy, Josep Maria | - |
dc.contributor.author | Ribó Gomis, Marc | - |
dc.contributor.author | Zanin, Roberta | - |
dc.date.accessioned | 2014-10-14T08:20:19Z | - |
dc.date.available | 2014-10-14T08:20:19Z | - |
dc.date.issued | 2014-03 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.uri | http://hdl.handle.net/2445/58575 | - |
dc.description.abstract | The radio galaxy IC 310 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 > 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 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 γ-ray regime. Methods. The light curve of IC 310 above 300 GeV 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 (>5σ). The photon index between 120 GeV and 8 TeV 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 1 TeV changes by a factor of ~7. Fermi-LAT detected only eight γ-ray events in the energy range 10 GeV<br>500 GeV 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. Conclusions. The rapid variability measured in γ-rays and X-rays confirms the blazar-like behavior of IC 310. The multi-TeV γ-ray emission seems to originate from scales of less than 80 Schwarzschild radii (for a black hole mass of 2 × 108 M⊙) 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. | - |
dc.format.extent | 10 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Springer Verlag | - |
dc.relation.isformatof | Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201321938 | - |
dc.relation.ispartof | Astronomy and Astrophysics, 2014, vol. 563, p. A91 | - |
dc.relation.uri | http://dx.doi.org/10.1051/0004-6361/201321938 | - |
dc.rights | (c) Springer Verlag, 2014 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Galàxies actives | - |
dc.subject.classification | Astronomia de raigs X | - |
dc.subject.classification | Astronomia de raigs gamma | - |
dc.subject.classification | Raigs còsmics | - |
dc.subject.classification | Astrofísica | - |
dc.subject.other | Active galaxies | - |
dc.subject.other | X-ray astronomy | - |
dc.subject.other | Gamma ray astronomy | - |
dc.subject.other | Cosmic rays | - |
dc.subject.other | Astrophysics | - |
dc.title | Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 644031 | - |
dc.date.updated | 2014-10-14T08:20:20Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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644031.pdf | 217.67 kB | Adobe PDF | View/Open |
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