Coronal origin of the polarization of the high-energy emission of Cygnus X-1
Context. Cygnus X-1 is the candidate with the highest probability of containing a black hole among the X-ray binary systems in the Galaxy. It is also by far the most often studied of these objects. Recently, the International Gamma-Ray Astrophysics Laboratory Imager on board the Integral satellite (...
| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2014
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/101521 https://ri.conicet.gov.ar/11336/5835 http://www.aanda.org/articles/aa/abs/2014/02/aa23316-13/aa23316-13.html http://arxiv.org/abs/1402.0524v1 |
| Aporte de: |
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I19-R120-10915-101521 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas X-ray binaries Radiation mechanisms Gamma rays Polarization Cygnus -1 Stars Non-thermal mechanisms |
| spellingShingle |
Ciencias Astronómicas X-ray binaries Radiation mechanisms Gamma rays Polarization Cygnus -1 Stars Non-thermal mechanisms Romero, Gustavo Esteban Vieyro, Florencia Laura Chaty, S. Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| topic_facet |
Ciencias Astronómicas X-ray binaries Radiation mechanisms Gamma rays Polarization Cygnus -1 Stars Non-thermal mechanisms |
| description |
Context. Cygnus X-1 is the candidate with the highest probability of containing a black hole among the X-ray binary systems in the Galaxy. It is also by far the most often studied of these objects. Recently, the International Gamma-Ray Astrophysics Laboratory Imager on board the Integral satellite (INTEGRAL/IBIS) detected strong polarization in the high-energy radiation of this source, between 400 keV and 2 MeV. This radiation has been attributed to a jet launched by the black hole.
Aims. We consider whether the corona around the black hole might be the site of production of the polarized emission instead of the jet.
Methods. We studied self-consistently the injection of nonthermal particles in the hot, magnetized plasma around the black hole.
Results. We show that both the high-energy spectrum and polarization of Cygnus X-1 in the low-hard state can originate in the corona, without needing to invoke a jet. We estimate the degree of polarization in the intermediate state, where there is no jet, to provide a tool to test our model.
Conclusions. Contrary to the commonly accepted view, the jet might not be the source of the MeV polarized tail in the spectrum of Cygnus X-1. |
| format |
Articulo Articulo |
| author |
Romero, Gustavo Esteban Vieyro, Florencia Laura Chaty, S. |
| author_facet |
Romero, Gustavo Esteban Vieyro, Florencia Laura Chaty, S. |
| author_sort |
Romero, Gustavo Esteban |
| title |
Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| title_short |
Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| title_full |
Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| title_fullStr |
Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| title_full_unstemmed |
Coronal origin of the polarization of the high-energy emission of Cygnus X-1 |
| title_sort |
coronal origin of the polarization of the high-energy emission of cygnus x-1 |
| publishDate |
2014 |
| url |
http://sedici.unlp.edu.ar/handle/10915/101521 https://ri.conicet.gov.ar/11336/5835 http://www.aanda.org/articles/aa/abs/2014/02/aa23316-13/aa23316-13.html http://arxiv.org/abs/1402.0524v1 |
| work_keys_str_mv |
AT romerogustavoesteban coronaloriginofthepolarizationofthehighenergyemissionofcygnusx1 AT vieyroflorencialaura coronaloriginofthepolarizationofthehighenergyemissionofcygnusx1 AT chatys coronaloriginofthepolarizationofthehighenergyemissionofcygnusx1 |
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Repositorios |
| _version_ |
1764820442601750530 |