Reference : Hard X-ray emission from eta Carinae
Scientific journals : Letter to the editor
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/17761
Hard X-ray emission from eta Carinae
English
Leyder, Jean-Christophe mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Walter, R. [INTEGRAL Science Data Centre, Université de Genève, Chemin d'Écogia 16, 1290 Versoix, Switzerland Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
1-Jan-2008
Astronomy and Astrophysics
EDP Sciences
477
L29-L32
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] gamma rays: observations ; X-rays: binaries ; X-rays: individuals: <ASTROBJ>η Car</ASTROBJ> ; X-rays: individuals: <ASTROBJ>1E 1048.1-5937</ASTROBJ> ; X-rays: individuals: <ASTROBJ>IGR J10447-6027</ASTROBJ>
[en] Context: If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and gamma-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected. Aims: To detect this emission, observations of eta Carinae were performed with INTEGRAL, leveraging its high spatial resolution. Methods: Deep hard X-ray images of the region of eta Car were constructed in several energy bands. Results: The hard X-ray emission previously detected by BeppoSax around eta Car originates from at least 3 different point sources. The emission of eta Car itself can be isolated for the first time, and its spectrum unambiguously analyzed. The X-ray emission of eta Car in the 22-100 keV energy range is very hard (Gamma ~= 1 ± 0.4) and its luminosity is 7 × 10^33 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. eta Car is expected to be detected in the GeV energy range.
http://hdl.handle.net/2268/17761
10.1051/0004-6361:20078981
http://de.arxiv.org/abs/0712.1491
http://adsabs.harvard.edu/abs/2008A%26A...477L..29L

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