Hard X-ray emission from η Carinae

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作者：
Leyder, J.-C. [1 ,2 ]
Walter, R. [2 ,3 ]
Rauw, G. [1 ]
机构：
[1] Institut d'Astrophysique et de Géophysique, Université de Liège, Bĝtiment B5c, Allée du 6-Août 17, 4000 Liège, Belgium
[2] INTEGRAL Science Data Centre, Université de Genève, Chemin d'Icogia 16, 1290 Versoix, Switzerland
[3] Observatoire de Genéve, Universiti de Genéve, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
来源：
Astronomy and Astrophysics | 2008年 / 477卷 / 03期
关键词：
Context. If relativistic particle acceleration takes place in colliding-wind binaries; hard X-rays and -rays are expected through inverse Compton emission; but to date these have never been unambiguously detected. Aims. To detect this emission; observations of Carinae were performed with INTEGRAL; leveraging its high spatial resolution. Methods. Deep hard X-ray images of the region of Car were constructed in several energy bands. Results. The hard X-ray emission previously detected by BeppoSax around Car originates from at least 3 different point sources. The emission of Car itself can be isolated for the first time; and its spectrum unambiguously analyzed. The X-ray emission of Car in the 22-100 keV energy range is very hard () and its luminosity is erg s -1. Conclusions. The observed emission is in agreement with the predictions of inverse Compton models; and corresponds to about 0.1% of the energy available in the wind collision. Car is expected to be detected in the GeV energy range. © 2008 ESO;
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