Detection of Gamma-Ray Emission from the Eta-Carinae Region
2009 (English)In: ASTROPHYSICAL JOURNAL LETTERS, ISSN 2041-8205, Vol. 698, no 2, L142-L146 p.Article in journal (Refereed) Published
We present the results of extensive observations by the gamma-ray AGILE satellite of the Galactic region hosting the Carina nebula and the remarkable colliding wind binary Eta Carinae (eta Car) during the period 2007 July-2009 January. We detect a gamma-ray source (1AGL J1043-5931) consistent with the position of eta Car. If 1AGL J1043-5931 is associated with the Car system, our data provide the long sought first detection above 100 MeV of a colliding wind binary. The average gamma-ray flux above 100 MeV and integrated over the preperiastron period 2007 July-2008 October is F(gamma) = (37 +/- 5) x 10(-8) ph cm(-2) s(-1) corresponding to an average gamma-ray luminosity of L(gamma) = 3.4 x 10(34) erg s(-1) for a distance of 2.3 kpc. We also report a two-day gamma-ray flaring episode of 1AGL J1043-5931 on 2008 October 11-13 possibly related to a transient acceleration and radiation episode of the strongly variable shock in the system.
Place, publisher, year, edition, pages
2009. Vol. 698, no 2, L142-L146 p.
gamma rays: observations, stars: individual: Eta Carinae, stars: winds, outflows, X-rays: binaries
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-85836DOI: 10.1088/0004-637X/698/2/L142ISI: 000267052600016OAI: oai:DiVA.org:kth-85836DiVA: diva2:500181
QC 201202132012-02-132012-02-132012-02-13Bibliographically approved