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| Paper: |
Not Only Once: The Amazing γ-ray Activity of the Blazar PKS 1510–089 |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
271 |
| Authors: |
D’Ammando, F.; Raiteri, C. M.; Villata, M.; Romano, P.; Covino, S.; Krimm, H.; Tavani, M. |
| Abstract: |
PKS 1510–089 is a powerful Flat Spectrum Radio Quasar at
z=0.361 with radiative output dominated by the γ-ray emission. In the
last two years PKS 1510–089 showed high variability over all the
electromagnetic spectrum and in particular very high γ-ray activity was
detected by the Gamma-Ray Imaging Detector on board the AGILE satellite with
flaring episodes in August 2007 and March 2008. An extraordinary activity
was detected in March 2009 with several flaring episodes and a flux that reached
500 × 10–8 photons cm–2 s-1. Multiwavelength observations of PKS
1510–089 seem to indicate the presence of Seyfert-like features such as
little blue bump and big blue bump. Moreover, X-ray observations suggested
the presence of a soft X-ray excess that could be a feature of the bulk
Comptonization mechanism. We present the results of the analysis of the
multiwavelength data collected by GASP-WEBT, REM, Swift and AGILE during these γ-ray flares and the theoretical implications for the emission mechanisms. |
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