Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0714v&link_type=abstract
American Astronomical Society, HEAD meeting #12, #7.14
Astronomy and Astrophysics
Astronomy
Scientific paper
The blazar 3C 454.3 is the most variable and intense extragalactic gamma-ray source detected by AGILE and Fermi during the last 4 years. Its gamma-ray properties are dramatically different from what was previously known in the EGRET era. This remarkable source shows extreme flux variability (about a factor of 20) on a time-scale of 24-48 hours, as well as repeated flares on a time-scale of more than a year. The dynamic range, from the quiescence up to the most intense gamma-ray super-flare, is of about two orders of magnitude. We review the gamma-ray properties of 3C 454.3 by means of the available data, comparing both the characteristics of flares at different levels and their multi-wavelength behaviors. Moreover, an interpretation of both the long- and short-term properties of 3C 454.3 is presented, with particular emphasis on the two gamma-ray super-flares observed in 2009 and 2010, when 3C 454.3 became the brightest source of the whole gamma-ray sky.
AGILE Team
Vercellone Stefano
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