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Fermi-large area telescope observations of the exceptional gamma-ray outbursts of 3C 273 in 2009 September
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2010 (English)In: ASTROPHYSICAL JOURNAL LETTERS, ISSN 2041-8205, Vol. 714, no 1, L73-L78 p.Article in journal (Refereed) Published
Abstract [en]

We present the light curves and spectral data of two exceptionally luminous gamma-ray outbursts observed by the Large Area Telescope experiment on board the Fermi Gamma-ray Space Telescope from 3C 273 in 2009 September. During these flares, having a duration of a few days, the source reached its highest gamma-ray flux ever measured. This allowed us to study, in some details, their spectral and temporal structures. The rise and the decay are asymmetric on timescales of 6 hr, and the spectral index was significantly harder during the flares than during the preceding 11 months. We also found that short, very intense flares put out the same time-integrated energy as long, less intense flares like that observed in 2009 August.

Place, publisher, year, edition, pages
2010. Vol. 714, no 1, L73-L78 p.
Keyword [en]
gamma rays: galaxies, quasars: individual (3C 273)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-28263DOI: 10.1088/2041-8205/714/1/L73ISI: 000276971300015Scopus ID: 2-s2.0-77950998239OAI: oai:DiVA.org:kth-28263DiVA: diva2:387544
Funder
Knut and Alice Wallenberg Foundation
Note
QC 20110114Available from: 2011-01-14 Created: 2011-01-12 Last updated: 2011-01-14Bibliographically approved

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Ryde, Felix

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