Volume 477, Number 3, January III 2008
|Page(s)||L29 - L32|
|Published online||04 December 2007|
Letter to the Editor
Hard X-ray emission from η Carinae
Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6-Août 17, Bâtiment B5c, 4000 Liège, Belgium e-mail: firstname.lastname@example.org
2 Science Data Centre, Université de Genève, Chemin d'Écogia 16, 1290 Versoix, Switzerland
3 Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
Accepted: 16 November 2007
Context. If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and γ-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected.
Aims. To detect this emission, observations of η Carinae were performed with INTEGRAL, leveraging its high spatial resolution.
Methods. Deep hard X-ray images of the region of η Car were constructed in several energy bands.
Results. The hard X-ray emission previously detected by BeppoSax around η Car originates from at least 3 different point sources. The emission of η Car itself can be isolated for the first time, and its spectrum unambiguously analyzed. The X-ray emission of η 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. η Car is expected to be detected in the GeV energy range.
Key words: gamma rays: observations / X-rays: binaries / X-rays: individuals: η Car / X-rays: individuals: 1E 1048.1-5937 / X-rays: individuals: IGR J10447-6027
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.