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

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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 exper...

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Autores principales: Valle, María Victoria del, Romero, Gustavo Esteban, Orellana, Mariana Dominga
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/99098
https://ri.conicet.gov.ar/11336/23361
http://adsabs.harvard.edu/abs/2009BAAA...52..259D
http://www.astronomiaargentina.org.ar/b52/2009BAAA...52..259D.pdf
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-99098
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
spellingShingle Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
Valle, María Victoria del
Romero, Gustavo Esteban
Orellana, Mariana Dominga
On the nature of the episodic gamma-ray flare observed in Cygnus X-1
topic_facet Física
Ciencias Astronómicas
X ray binaries
Gamma rays
Microquásars
Cygnus X-1 (microcuásar)
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.
format Articulo
Articulo
author Valle, María Victoria del
Romero, Gustavo Esteban
Orellana, Mariana Dominga
author_facet Valle, María Victoria del
Romero, Gustavo Esteban
Orellana, Mariana Dominga
author_sort Valle, María Victoria del
title On the nature of the episodic gamma-ray flare observed in Cygnus X-1
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
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/99098
https://ri.conicet.gov.ar/11336/23361
http://adsabs.harvard.edu/abs/2009BAAA...52..259D
http://www.astronomiaargentina.org.ar/b52/2009BAAA...52..259D.pdf
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