Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1

We report on the results from the observations in the very high energy band (VHE; Eγ ≥ 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC telescope, for a total of 40 hr during 26 nights, spanning the period between 2006 June and November. Searc...

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Autores: MAGIC Collaboration, Paredes i Poy, Josep Maria, Ribó Gomis, Marc, Bosch i Ramon, Valentí
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2007
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/150806
Acceso en línea:https://hdl.handle.net/2445/150806
Access Level:acceso abierto
Palabra clave:Acceleradors de partícules
Astronomia de raigs gamma
Astronomia de raigs X
Particle accelerators
Gamma ray astronomy
X-ray astronomy
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spelling Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1MAGIC CollaborationParedes i Poy, Josep MariaRibó Gomis, MarcBosch i Ramon, ValentíAcceleradors de partículesAstronomia de raigs gammaAstronomia de raigs XParticle acceleratorsGamma ray astronomyX-ray astronomyWe report on the results from the observations in the very high energy band (VHE; Eγ ≥ 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC telescope, for a total of 40 hr during 26 nights, spanning the period between 2006 June and November. Searches for steady γ-ray signals yielded no positive result, and upper limits to the integral flux ranging between 1% and 2% of the Crab Nebula flux, depending on the energy, have been established. We also analyzed each observation night independently, obtaining evidence of γ-ray signals at the 4.0 σ significance level (3.2 σ after trial correction) for 154 minutes of effective on-time (EOT) on September 24 between 20:58 and 23:41 UTC, coinciding with an X-ray flare seen by RXTE, Swift, and INTEGRAL. A search for faster-varying signals within a night resulted in an excess with a significance of 4.9 σ (4.1 σ after trial correction) for 79 minutes EOT between 22:17 and 23:41 UTC. The measured excess is compatible with a pointlike source at the position of Cygnus X-1 and excludes the nearby radio nebula powered by its relativistic jet. The differential energy spectrum is well fitted by an unbroken power law described as dN/(dA dt dE) = (2.3 ± 0.6) × 10-12(E/1 TeV)-3.2±0.6. This is the first experimental evidence of VHE emission from a stellar mass black hole and therefore from a confirmed accreting X-ray binary.Institute of Physics (IOP)2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/150806Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1086/521145Astrophysical Journal, 2007, vol. 665, p. 51-54https://doi.org/10.1086/521145(c) American Astronomical Society, 2007info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1508062026-05-27T06:46:51Z
dc.title.none.fl_str_mv Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
title Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
spellingShingle Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
MAGIC Collaboration
Acceleradors de partícules
Astronomia de raigs gamma
Astronomia de raigs X
Particle accelerators
Gamma ray astronomy
X-ray astronomy
title_short Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
title_full Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
title_fullStr Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
title_full_unstemmed Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
title_sort Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1
dc.creator.none.fl_str_mv MAGIC Collaboration
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Bosch i Ramon, Valentí
author MAGIC Collaboration
author_facet MAGIC Collaboration
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Bosch i Ramon, Valentí
author_role author
author2 Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Bosch i Ramon, Valentí
author2_role author
author
author
dc.subject.none.fl_str_mv Acceleradors de partícules
Astronomia de raigs gamma
Astronomia de raigs X
Particle accelerators
Gamma ray astronomy
X-ray astronomy
topic Acceleradors de partícules
Astronomia de raigs gamma
Astronomia de raigs X
Particle accelerators
Gamma ray astronomy
X-ray astronomy
description We report on the results from the observations in the very high energy band (VHE; Eγ ≥ 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC telescope, for a total of 40 hr during 26 nights, spanning the period between 2006 June and November. Searches for steady γ-ray signals yielded no positive result, and upper limits to the integral flux ranging between 1% and 2% of the Crab Nebula flux, depending on the energy, have been established. We also analyzed each observation night independently, obtaining evidence of γ-ray signals at the 4.0 σ significance level (3.2 σ after trial correction) for 154 minutes of effective on-time (EOT) on September 24 between 20:58 and 23:41 UTC, coinciding with an X-ray flare seen by RXTE, Swift, and INTEGRAL. A search for faster-varying signals within a night resulted in an excess with a significance of 4.9 σ (4.1 σ after trial correction) for 79 minutes EOT between 22:17 and 23:41 UTC. The measured excess is compatible with a pointlike source at the position of Cygnus X-1 and excludes the nearby radio nebula powered by its relativistic jet. The differential energy spectrum is well fitted by an unbroken power law described as dN/(dA dt dE) = (2.3 ± 0.6) × 10-12(E/1 TeV)-3.2±0.6. This is the first experimental evidence of VHE emission from a stellar mass black hole and therefore from a confirmed accreting X-ray binary.
publishDate 2007
dc.date.none.fl_str_mv 2007
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/2445/150806
url https://hdl.handle.net/2445/150806
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/10.1086/521145
Astrophysical Journal, 2007, vol. 665, p. 51-54
https://doi.org/10.1086/521145
dc.rights.none.fl_str_mv (c) American Astronomical Society, 2007
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Astronomical Society, 2007
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
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 15,301603

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