Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays
The radio galaxy NGC 1275, recently identified as a very high energy (VHE, >100 GeV) γ-ray emitter by MAGIC, is one of the few non-blazar active galactic nuclei detected in the VHE regime. The purpose of this work is to better understand the origin of the γ-ray emission and locate it within the g...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/58589 |
| Acceso en línea: | https://hdl.handle.net/2445/58589 |
| Access Level: | acceso abierto |
| Palabra clave: | Galàxies Galàxies actives Jets (Astrofísica) Raigs gamma Astrofísica Galaxies Active galaxies Astrophysical jets Gamma rays Astrophysics |
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Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-raysMarcote Martin, BenitoMunar i Adrover, PereParedes i Poy, Josep MariaParedes Fortuny, XavierPersic, M.Ribó Gomis, MarcZanin, RobertaMAGIC CollaborationGalàxiesGalàxies activesJets (Astrofísica)Raigs gammaAstrofísicaGalaxiesActive galaxiesAstrophysical jetsGamma raysAstrophysicsThe radio galaxy NGC 1275, recently identified as a very high energy (VHE, >100 GeV) γ-ray emitter by MAGIC, is one of the few non-blazar active galactic nuclei detected in the VHE regime. The purpose of this work is to better understand the origin of the γ-ray emission and locate it within the galaxy. Methods: We studied contemporaneous multifrequency observations of NGC 1275 and modeled the overall spectral energy distribution. We analyzed unpublished MAGIC observations carried out between October 2009 and February 2010, and the previously published observations taken between August 2010 and February 2011. We studied the multiband variability and correlations by analyzing data of Fermi-LAT in the 100 MeV-100 GeV energy band, as well as Chandra (X-ray), KVA (optical), and MOJAVE (radio) data taken during the same period. Results: Using customized Monte Carlo simulations corresponding to early MAGIC stereoscopic data, we detect NGC 1275 also in the earlier MAGIC campaign. The flux level and energy spectra are similar to the results of the second campaign. The monthly light curve above 100 GeV shows a hint of variability at the 3.6σ level. In the Fermi-LAT band, both flux and spectral shape variabilities are reported. The optical light curve is also variable and shows a clear correlation with the γ-ray flux above 100 MeV. In radio, three compact components are resolved in the innermost part of the jet. One of these components shows a similar trend as the Fermi-LAT and KVA light curves. The γ-ray spectra measured simultaneously with MAGIC and Fermi-LAT from 100 MeV to 650 GeV can be well fitted either by a log-parabola or by a power-law with a subexponential cutoff for the two observation campaigns. A single-zone synchrotron-self-Compton model, with an electron spectrum following a power-law with an exponential cutoff, can explain the broadband spectral energy distribution and the multifrequency behavior of the source. However, this model suggests an untypical low bulk-Lorentz factor or a velocity alignment closer to the line of sight than the parsec-scale radio jet.Springer Verlag2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/58589Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201322951Astronomy and Astrophysics, 2014, vol. 564, num. A5, p. 1-13http://dx.doi.org/10.1051/0004-6361/201322951(c) Springer Verlag, 2014info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/585892026-05-27T06:46:51Z |
| dc.title.none.fl_str_mv |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| title |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| spellingShingle |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays Marcote Martin, Benito Galàxies Galàxies actives Jets (Astrofísica) Raigs gamma Astrofísica Galaxies Active galaxies Astrophysical jets Gamma rays Astrophysics |
| title_short |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| title_full |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| title_fullStr |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| title_full_unstemmed |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| title_sort |
Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy γ-rays |
| dc.creator.none.fl_str_mv |
Marcote Martin, Benito Munar i Adrover, Pere Paredes i Poy, Josep Maria Paredes Fortuny, Xavier Persic, M. Ribó Gomis, Marc Zanin, Roberta MAGIC Collaboration |
| author |
Marcote Martin, Benito |
| author_facet |
Marcote Martin, Benito Munar i Adrover, Pere Paredes i Poy, Josep Maria Paredes Fortuny, Xavier Persic, M. Ribó Gomis, Marc Zanin, Roberta MAGIC Collaboration |
| author_role |
author |
| author2 |
Munar i Adrover, Pere Paredes i Poy, Josep Maria Paredes Fortuny, Xavier Persic, M. Ribó Gomis, Marc Zanin, Roberta MAGIC Collaboration |
| author2_role |
author author author author author author author |
| dc.subject.none.fl_str_mv |
Galàxies Galàxies actives Jets (Astrofísica) Raigs gamma Astrofísica Galaxies Active galaxies Astrophysical jets Gamma rays Astrophysics |
| topic |
Galàxies Galàxies actives Jets (Astrofísica) Raigs gamma Astrofísica Galaxies Active galaxies Astrophysical jets Gamma rays Astrophysics |
| description |
The radio galaxy NGC 1275, recently identified as a very high energy (VHE, >100 GeV) γ-ray emitter by MAGIC, is one of the few non-blazar active galactic nuclei detected in the VHE regime. The purpose of this work is to better understand the origin of the γ-ray emission and locate it within the galaxy. Methods: We studied contemporaneous multifrequency observations of NGC 1275 and modeled the overall spectral energy distribution. We analyzed unpublished MAGIC observations carried out between October 2009 and February 2010, and the previously published observations taken between August 2010 and February 2011. We studied the multiband variability and correlations by analyzing data of Fermi-LAT in the 100 MeV-100 GeV energy band, as well as Chandra (X-ray), KVA (optical), and MOJAVE (radio) data taken during the same period. Results: Using customized Monte Carlo simulations corresponding to early MAGIC stereoscopic data, we detect NGC 1275 also in the earlier MAGIC campaign. The flux level and energy spectra are similar to the results of the second campaign. The monthly light curve above 100 GeV shows a hint of variability at the 3.6σ level. In the Fermi-LAT band, both flux and spectral shape variabilities are reported. The optical light curve is also variable and shows a clear correlation with the γ-ray flux above 100 MeV. In radio, three compact components are resolved in the innermost part of the jet. One of these components shows a similar trend as the Fermi-LAT and KVA light curves. The γ-ray spectra measured simultaneously with MAGIC and Fermi-LAT from 100 MeV to 650 GeV can be well fitted either by a log-parabola or by a power-law with a subexponential cutoff for the two observation campaigns. A single-zone synchrotron-self-Compton model, with an electron spectrum following a power-law with an exponential cutoff, can explain the broadband spectral energy distribution and the multifrequency behavior of the source. However, this model suggests an untypical low bulk-Lorentz factor or a velocity alignment closer to the line of sight than the parsec-scale radio jet. |
| publishDate |
2014 |
| dc.date.none.fl_str_mv |
2014 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion |
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article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/58589 |
| url |
https://hdl.handle.net/2445/58589 |
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Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201322951 Astronomy and Astrophysics, 2014, vol. 564, num. A5, p. 1-13 http://dx.doi.org/10.1051/0004-6361/201322951 |
| 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 |
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application/pdf |
| dc.publisher.none.fl_str_mv |
Springer Verlag |
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Springer Verlag |
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Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
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Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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