Volume 555, July 2013
|Number of page(s)||5|
|Published online||12 July 2013|
Fermi/LAT detection of extraordinary variability in the gamma-ray emission of the blazar PKS 1510-089
1 INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46,
23807 Merate ( LC), Italy
2 INAF – Osservatorio Astrofisico di Torino, via P. Giuria 1, 10125 Torino, Italy
3 INFN – Sezione di Torino, via P. Giuria 1, 10125 Torino, Italy
Received: 10 April 2013
Accepted: 14 June 2013
We have reanalyzed the giant outburst of the blazar PKS 1510−089 (z = 0.36) that occurred on 2011 October−November. The γ-ray flux in the 0.1−100 GeV energy range exceeded the value of 10-5 ph cm-2 s-1 for several days. The peak flux was reached on 2011 October 19, with a value of ~4.4 × 10-5 ph cm-2 s-1, which in turn corresponds to a luminosity of ~2 × 1049 erg s-1. A very short timescale variability was measured. Particularly on 2011 October 18, the flux-doubling time was as short as ~20 min. This is the shortest variability ever detected in the MeV-GeV energy band. We compared our analysis with two other outbursts observed in 2009 March and 2012 February−March, when the blazar was also detected by H.E.S.S. and MAGIC to infer information about the emission at hundreds of GeV.
Key words: quasars: individual: PKS B1510-089 / galaxies: jets / gamma rays: galaxies
© ESO, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.