On the nature of the episodic gamma-ray flare observed in Cygnus X-1
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...
| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2009
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| 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: |
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I19-R120-10915-99098 |
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| 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 |
| work_keys_str_mv |
AT vallemariavictoriadel onthenatureoftheepisodicgammarayflareobservedincygnusx1 AT romerogustavoesteban onthenatureoftheepisodicgammarayflareobservedincygnusx1 AT orellanamarianadominga onthenatureoftheepisodicgammarayflareobservedincygnusx1 |
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Repositorios |
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1764820492870483970 |