Letter to the editor (Scientific journals)
Hard X-ray emission from eta Carinae
Leyder, Jean-Christophe; Walter, R.; Rauw, Grégor
2008In Astronomy and Astrophysics, 477, p. 29-L32
Peer Reviewed verified by ORBi
 

Files


Full Text
0712.1491.pdf
Author preprint (397.92 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
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>
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Leyder, Jean-Christophe ;  Université de Liège - ULiège > 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  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Language :
English
Title :
Hard X-ray emission from eta Carinae
Publication date :
01 January 2008
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
477
Pages :
L29-L32
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 August 2009

Statistics


Number of views
85 (4 by ULiège)
Number of downloads
38 (1 by ULiège)

Scopus citations®
 
69
Scopus citations®
without self-citations
54
OpenCitations
 
48

Bibliography


Similar publications



Contact ORBi