Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310
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 controver...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/58575 |
| Acceso en línea: | https://hdl.handle.net/2445/58575 |
| Access Level: | acceso abierto |
| Palabra clave: | Galàxies actives Astronomia de raigs X Astronomia de raigs gamma Raigs còsmics Astrofísica Active galaxies X-ray astronomy Gamma ray astronomy Cosmic rays Astrophysics |
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Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310MAGIC CollaborationMarcote Martin, BenitoMoldón Vara, Francisco JavierMunar i Adrover, PereParedes i Poy, Josep MariaRibó Gomis, MarcZanin, RobertaGalàxies activesAstronomia de raigs XAstronomia de raigs gammaRaigs còsmicsAstrofísicaActive galaxiesX-ray astronomyGamma ray astronomyCosmic raysAstrophysicsThe 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.Springer Verlag2014201420142014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion10 p.application/pdfhttps://hdl.handle.net/2445/58575Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201321938Astronomy and Astrophysics, 2014, vol. 563, p. A91http://dx.doi.org/10.1051/0004-6361/201321938(c) Springer Verlag, 2014info:eu-repo/semantics/openAccessoai:recercat.cat:2445/585752026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| title |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| spellingShingle |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 MAGIC Collaboration Galàxies actives Astronomia de raigs X Astronomia de raigs gamma Raigs còsmics Astrofísica Active galaxies X-ray astronomy Gamma ray astronomy Cosmic rays Astrophysics |
| title_short |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| title_full |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| title_fullStr |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| title_full_unstemmed |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| title_sort |
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310 |
| dc.creator.none.fl_str_mv |
MAGIC Collaboration Marcote Martin, Benito Moldón Vara, Francisco Javier Munar i Adrover, Pere Paredes i Poy, Josep Maria Ribó Gomis, Marc Zanin, Roberta |
| author |
MAGIC Collaboration |
| author_facet |
MAGIC Collaboration Marcote Martin, Benito Moldón Vara, Francisco Javier Munar i Adrover, Pere Paredes i Poy, Josep Maria Ribó Gomis, Marc Zanin, Roberta |
| author_role |
author |
| author2 |
Marcote Martin, Benito Moldón Vara, Francisco Javier Munar i Adrover, Pere Paredes i Poy, Josep Maria Ribó Gomis, Marc Zanin, Roberta |
| author2_role |
author author author author author author |
| dc.subject.none.fl_str_mv |
Galàxies actives Astronomia de raigs X Astronomia de raigs gamma Raigs còsmics Astrofísica Active galaxies X-ray astronomy Gamma ray astronomy Cosmic rays Astrophysics |
| topic |
Galàxies actives Astronomia de raigs X Astronomia de raigs gamma Raigs còsmics Astrofísica Active galaxies X-ray astronomy Gamma ray astronomy Cosmic rays Astrophysics |
| description |
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. |
| publishDate |
2014 |
| dc.date.none.fl_str_mv |
2014 2014 2014 2014 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion |
| format |
article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/58575 |
| url |
https://hdl.handle.net/2445/58575 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201321938 Astronomy and Astrophysics, 2014, vol. 563, p. A91 http://dx.doi.org/10.1051/0004-6361/201321938 |
| dc.rights.none.fl_str_mv |
(c) Springer Verlag, 2014 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) Springer Verlag, 2014 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
10 p. application/pdf |
| dc.publisher.none.fl_str_mv |
Springer Verlag |
| publisher.none.fl_str_mv |
Springer Verlag |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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1869419154118803456 |
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15,811543 |