MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007

Context. We present the results of a long M 87 monitoring campaign in very high energy γ-rays with the MAGIC-I Cherenkov telescope. Aims. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy γ-ray emission of M 87 during a low state. Methods....

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Detalles Bibliográficos
Autores: MAGIC Collaboration, Munar i Adrover, Pere, Paredes i Poy, Josep Maria, Ribó Gomis, Marc, Moldón Vara, Francisco Javier
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/151160
Acceso en línea:https://hdl.handle.net/2445/151160
Access Level:acceso abierto
Palabra clave:Astronomia de raigs gamma
Observacions astronòmiques
Gamma ray astronomy
Astronomical observations
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spelling MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007MAGIC CollaborationMunar i Adrover, PereParedes i Poy, Josep MariaRibó Gomis, MarcMoldón Vara, Francisco JavierAstronomia de raigs gammaObservacions astronòmiquesGamma ray astronomyAstronomical observationsContext. We present the results of a long M 87 monitoring campaign in very high energy γ-rays with the MAGIC-I Cherenkov telescope. Aims. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy γ-ray emission of M 87 during a low state. Methods. A total of 150 h of data were taken between 2005 and 2007 with the single MAGIC-I telescope, out of which 128.6 h survived the data quality selection. We also collected data in the X-ray and Fermi-LAT bands from the literature (partially contemporaneous). Results. No flaring activity was found during the campaign. The source was found to be in a persistent low-emission state, which was at a confidence level of 7σ. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a photon index Γ = 2.21 ± 0.21 and a flux normalization at 300 GeV of (7.7 ± 1.3) × 10-8 TeV-1 s-1 m-2. The extrapolation of the MAGIC spectrum into the GeV energy range matches the previously published Fermi-LAT spectrum well, covering a combined energy range of four orders of magnitude with the same spectral index. We model the broad band energy spectrum with a spine layer model, which can satisfactorily describe our data.EDP Sciences2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/151160Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/201117827Astronomy & Astrophysics, 2012, vol. 544, num. A96https://doi.org/10.1051/0004-6361/201117827(c) The European Southern Observatory (ESO), 2012info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1511602026-05-27T06:46:51Z
dc.title.none.fl_str_mv MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
title MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
spellingShingle MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
MAGIC Collaboration
Astronomia de raigs gamma
Observacions astronòmiques
Gamma ray astronomy
Astronomical observations
title_short MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
title_full MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
title_fullStr MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
title_full_unstemmed MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
title_sort MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
dc.creator.none.fl_str_mv MAGIC Collaboration
Munar i Adrover, Pere
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Moldón Vara, Francisco Javier
author MAGIC Collaboration
author_facet MAGIC Collaboration
Munar i Adrover, Pere
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Moldón Vara, Francisco Javier
author_role author
author2 Munar i Adrover, Pere
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Moldón Vara, Francisco Javier
author2_role author
author
author
author
dc.subject.none.fl_str_mv Astronomia de raigs gamma
Observacions astronòmiques
Gamma ray astronomy
Astronomical observations
topic Astronomia de raigs gamma
Observacions astronòmiques
Gamma ray astronomy
Astronomical observations
description Context. We present the results of a long M 87 monitoring campaign in very high energy γ-rays with the MAGIC-I Cherenkov telescope. Aims. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy γ-ray emission of M 87 during a low state. Methods. A total of 150 h of data were taken between 2005 and 2007 with the single MAGIC-I telescope, out of which 128.6 h survived the data quality selection. We also collected data in the X-ray and Fermi-LAT bands from the literature (partially contemporaneous). Results. No flaring activity was found during the campaign. The source was found to be in a persistent low-emission state, which was at a confidence level of 7σ. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a photon index Γ = 2.21 ± 0.21 and a flux normalization at 300 GeV of (7.7 ± 1.3) × 10-8 TeV-1 s-1 m-2. The extrapolation of the MAGIC spectrum into the GeV energy range matches the previously published Fermi-LAT spectrum well, covering a combined energy range of four orders of magnitude with the same spectral index. We model the broad band energy spectrum with a spine layer model, which can satisfactorily describe our data.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/151160
url https://hdl.handle.net/2445/151160
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201117827
Astronomy & Astrophysics, 2012, vol. 544, num. A96
https://doi.org/10.1051/0004-6361/201117827
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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