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Fermi large area telescope observation of a gamma-ray source at the position of Eta Carinae
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2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 723, no 1, 649-657 p.Article in journal (Refereed) Published
Abstract [en]

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected a gamma-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The gamma-ray signal is detected significantly throughout the LAT energy band (i.e., up to similar to 100 GeV). The 0.1-100 GeV energy spectrum is well represented by a combination of a cutoff power-law model (<10 GeV) and a hard power-law component (>10 GeV). The total flux (>100 MeV) is 3.7(-0.1)(+0.3) x 10(-7) photons s(-1) cm(-2), with additional systematic uncertainties of 10%, and consistent with the average flux measured by AGILE. The light curve obtained by Fermi is consistent with steady emission. Our observations do not confirm the presence of a gamma-ray flare in 2008 October, as reported by Tavani et al., although we cannot exclude that a flare lasting only a few hours escaped detection by the Fermi LAT. We also do not find any evidence for gamma-ray variability that correlates with the large X-ray variability of Eta Carinae observed during 2008 December and 2009 January. We are thus not able to establish an unambiguous identification of the LAT source with Eta Carinae.

Place, publisher, year, edition, pages
2010. Vol. 723, no 1, 649-657 p.
Keyword [en]
binaries: general, stars: individual (Eta Carinae), supergiants
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-27097DOI: 10.1088/0004-637X/723/1/649ISI: 000284090100057ScopusID: 2-s2.0-78249252628OAI: diva2:376007
QC 20101209Available from: 2010-12-09 Created: 2010-12-06 Last updated: 2010-12-09Bibliographically approved

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