FERMI-LARGE AREA TELESCOPE OBSERVATIONS OF THE EXCEPTIONAL GAMMA-RAY OUTBURSTS OF 3C 273 IN 2009 SEPTEMBER
2010 (English)In: The Astrophysical Journal Letters, ISSN 2041-8205, Vol. 714, no 1, L73-L78 p.Article in journal (Refereed) Published
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.
gamma rays: galaxies, quasars: individual (3C 273)
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-48944DOI: 10.1088/2041-8205/714/1/L73ISI: 000276971300015OAI: oai:DiVA.org:su-48944DiVA: diva2:376203
authorCount :1672010-12-102010-12-102011-12-07Bibliographically approved