On the nature of the episodic gamma-ray flare observed in Cygnus X-1

Autores
Valle, María Victoria del; Romero, Gustavo Esteban; Orellana, Mariana Dominga
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The high-mass microquasar Cygnus X-1, the best established candidate for a stellar-mass black hole, has been detected in a flaring state at very high energies, E > 200 GeV (Albert et al. 2007). The observation was per- formed by the Atmospheric Cherenkov Telescope MAGIC. It is the first experimental evidence of very high energy emission produced by a galactic stellar-mass black hole. The observed high energy excess occurred in coin- cidence with an X-ray flare. The flare took place at orbital phase = 0.91, being = 1 the moment when the black hole is behind the companion star. In this configuration the absorption of gamma-ray photons produced by photon-photon annihilation with the stellar field is expected to be the highest. We present detailed calculations of the gamma-ray opacity due to pair creation along the whole orbit, and for different locations of the emitter (height above the compact object). We discuss the location of the gamma- ray producing region in Cygnus X-1 and the energetics required to produce the flare.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/99098
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/99098
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling On the nature of the episodic gamma-ray flare observed in Cygnus X-1Valle, María Victoria delRomero, Gustavo EstebanOrellana, Mariana DomingaFísicaCiencias AstronómicasX ray binariesGamma raysMicroquásarsCygnus X-1 (microcuásar)The high-mass microquasar Cygnus X-1, the best established candidate for a stellar-mass black hole, has been detected in a flaring state at very high energies, E > 200 GeV (Albert et al. 2007). The observation was per- formed by the Atmospheric Cherenkov Telescope MAGIC. It is the first experimental evidence of very high energy emission produced by a galactic stellar-mass black hole. The observed high energy excess occurred in coin- cidence with an X-ray flare. The flare took place at orbital phase = 0.91, being = 1 the moment when the black hole is behind the companion star. In this configuration the absorption of gamma-ray photons produced by photon-photon annihilation with the stellar field is expected to be the highest. We present detailed calculations of the gamma-ray opacity due to pair creation along the whole orbit, and for different locations of the emitter (height above the compact object). We discuss the location of the gamma- ray producing region in Cygnus X-1 and the energetics required to produce the flare.Facultad de Ciencias Astronómicas y Geofísicas2009-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf259-262http://sedici.unlp.edu.ar/handle/10915/99098enginfo:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/23361info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2009BAAA...52..259Dinfo:eu-repo/semantics/altIdentifier/url/http://www.astronomiaargentina.org.ar/b52/2009BAAA...52..259D.pdfinfo:eu-repo/semantics/altIdentifier/issn/1669-9521info:eu-repo/semantics/altIdentifier/hdl/11336/23361info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:19:56Zoai:sedici.unlp.edu.ar:10915/99098Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:19:57.151SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv On the nature of the episodic gamma-ray flare observed in Cygnus X-1
title On the nature of the episodic gamma-ray flare observed in Cygnus X-1
spellingShingle On the nature of the episodic gamma-ray flare observed in Cygnus X-1
Valle, María Victoria del
Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
title_short On the nature of the episodic gamma-ray flare observed in Cygnus X-1
title_full On the nature of the episodic gamma-ray flare observed in Cygnus X-1
title_fullStr On the nature of the episodic gamma-ray flare observed in Cygnus X-1
title_full_unstemmed On the nature of the episodic gamma-ray flare observed in Cygnus X-1
title_sort On the nature of the episodic gamma-ray flare observed in Cygnus X-1
dc.creator.none.fl_str_mv Valle, María Victoria del
Romero, Gustavo Esteban
Orellana, Mariana Dominga
author Valle, María Victoria del
author_facet Valle, María Victoria del
Romero, Gustavo Esteban
Orellana, Mariana Dominga
author_role author
author2 Romero, Gustavo Esteban
Orellana, Mariana Dominga
author2_role author
author
dc.subject.none.fl_str_mv Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
topic Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
dc.description.none.fl_txt_mv The high-mass microquasar Cygnus X-1, the best established candidate for a stellar-mass black hole, has been detected in a flaring state at very high energies, E > 200 GeV (Albert et al. 2007). The observation was per- formed by the Atmospheric Cherenkov Telescope MAGIC. It is the first experimental evidence of very high energy emission produced by a galactic stellar-mass black hole. The observed high energy excess occurred in coin- cidence with an X-ray flare. The flare took place at orbital phase = 0.91, being = 1 the moment when the black hole is behind the companion star. In this configuration the absorption of gamma-ray photons produced by photon-photon annihilation with the stellar field is expected to be the highest. We present detailed calculations of the gamma-ray opacity due to pair creation along the whole orbit, and for different locations of the emitter (height above the compact object). We discuss the location of the gamma- ray producing region in Cygnus X-1 and the energetics required to produce the flare.
Facultad de Ciencias Astronómicas y Geofísicas
description The high-mass microquasar Cygnus X-1, the best established candidate for a stellar-mass black hole, has been detected in a flaring state at very high energies, E > 200 GeV (Albert et al. 2007). The observation was per- formed by the Atmospheric Cherenkov Telescope MAGIC. It is the first experimental evidence of very high energy emission produced by a galactic stellar-mass black hole. The observed high energy excess occurred in coin- cidence with an X-ray flare. The flare took place at orbital phase = 0.91, being = 1 the moment when the black hole is behind the companion star. In this configuration the absorption of gamma-ray photons produced by photon-photon annihilation with the stellar field is expected to be the highest. We present detailed calculations of the gamma-ray opacity due to pair creation along the whole orbit, and for different locations of the emitter (height above the compact object). We discuss the location of the gamma- ray producing region in Cygnus X-1 and the energetics required to produce the flare.
publishDate 2009
dc.date.none.fl_str_mv 2009-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/99098
url http://sedici.unlp.edu.ar/handle/10915/99098
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/23361
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2009BAAA...52..259D
info:eu-repo/semantics/altIdentifier/url/http://www.astronomiaargentina.org.ar/b52/2009BAAA...52..259D.pdf
info:eu-repo/semantics/altIdentifier/issn/1669-9521
info:eu-repo/semantics/altIdentifier/hdl/11336/23361
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
259-262
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.070432

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