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Title: | AGILE detection of extreme γ -ray activity from the blazar PKS 1510-089 during March 2009: Multifrequency analysis | Authors: | D'AMMANDO, FILIPPO RAITERI, Claudia Maria VILLATA, Massimo Romano, P. Pucella, G. Krimm, H.A. COVINO, Stefano ORIENTI, Monica Giovannini, Gabriele VERCELLONE, STEFANO PIAN, Elena Donnarumma, I. VITTORINI, VALERIO TAVANI, Marco ARGAN, ANDREA Barbiellini, G. Boffelli, F. BULGARELLI, ANDREA CARAVEO, PATRIZIA Cattaneo, P.W. Chen, A.W. Cocco, V. COSTA, Elia DEL MONTE, Ettore DE PARIS, GIACINTO Di Cocco, G. EVANGELISTA, YURI FEROCI, MARCO Ferrari, A. FIORINI, MAURO Froysland, T. Frutti, M. FUSCHINO, FABIO Galli, M. GIANOTTI, Fulvio GIULIANI, ANDREA LABANTI, CLAUDIO Lapshov, I. LAZZAROTTO, FRANCESCO Lipari, P. Longo, F. MARISALDI, MARTINO MEREGHETTI, Sandro Morselli, A. PACCIANI, LUIGI PELLIZZONI, ALBERTO PAOLO Perotti, F. PIANO, Giovanni Picozza, P. PILIA, Maura Porrovecchio, G. Prest, M. Rapisarda, M. Rappoldi, A. Rubini, A. Sabatini, S. SOFFITTA, PAOLO Striani, E. TRIFOGLIO, MASSIMO TROIS, ALESSIO Vallazza, E. Zambra, A. Zanello, D. Agudo, I. Aller, H.D. Aller, M.F. Arkharov, A.A. Bach, U. Benitez, E. Berdyugin, A. Blinov, D.A. BUEMI, CARLA SIMONA Chen, W.P. DI PAOLA, Andrea DOLCI, Mauro Forné, E. Fuhrmann, L. Gómez, J.L. Gurwell, M.A. Jordan, B. Jorstad, S.G. Heidt, J. Hiriart, D. Hovatta, T. Hsiao, H.Y. Kimeridze, G. Konstantinova, T.S. Kopatskaya, E.N. Koptelova, E. Kurtanidze, O.M. Kurtanidze, S.O. Larionov, V.M. Lähteenmäki, A. LETO, PAOLO Lindfors, E. Marscher, A.P. McBreen, B. McHardy, I.M. Morozova, D.A. Nilsson, K. Pasanen, M. Roca-Sogorb, M. Sillanpää, A. Takalo, L.O. Tornikoski, M. TRIGILIO, CORRADO Troitsky, I.S. UMANA, Grazia Maria Gloria ANTONELLI, Lucio Angelo Colafrancesco, S. PITTORI, Carlotta Santolamazza, P. VERRECCHIA, Francesco Giommi, P. Salotti, L. |
Issue Date: | 2011 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 529 | First Page: | A145 | Abstract: | We report on the extreme gamma-ray activity from the FSRQ PKS 1510-089 observed by AGILE in March 2009. In the same period a radio-to-optical monitoring of the source was provided by the GASP-WEBT and REM. Moreover, several Swift ToO observations were triggered, adding important information on the source behaviour from optical/UV to hard X-rays. We paid particular attention to the calibration of the Swift/UVOT data to make it suitable to the blazars spectra. Simultaneous observations from radio to gamma rays allowed us to study in detail the correlation among the emission variability at different frequencies and to investigate the mechanisms at work. In the period 9-30 March 2009, AGILE detected an average gamma-ray flux of (311+/-21)x10^-8 ph cm^-2 s^-1 for E>100 MeV, and a peak level of (702+/-131)x10^-8 ph cm^-2 s^-1 on daily integration. The gamma-ray activity occurred during a period of increasing activity from near-IR to UV, with a flaring episode detected on 26-27 March 2009, suggesting that a single mechanism is responsible for the flux enhancement observed from near-IR to UV. By contrast, Swift/XRT observations seem to show no clear correlation of the X-ray fluxes with the optical and gamma-ray ones. However, the X-ray observations show a harder photon index (1.3-1.6) with respect to most FSRQs and a hint of harder-when-brighter behaviour, indicating the possible presence of a second emission component at soft X-ray energies. Moreover, the broad band spectrum from radio-to-UV confirmed the evidence of thermal features in the optical/UV spectrum of PKS 1510-089 also during high gamma-ray state. On the other hand, during 25-26 March 2009 a flat spectrum in the optical/UV energy band was observed, suggesting an important contribution of the synchrotron emission in this part of the spectrum during the brightest gamma-ray flare, therefore a significant shift of the synchrotron peak. | URI: | http://hdl.handle.net/20.500.12386/32952 | URL: | http://www.scopus.com/inward/record.url?eid=2-s2.0-79955455628&partnerID=MN8TOARS https://www.aanda.org/articles/aa/full_html/2011/05/aa16128-10/aa16128-10.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201016128 | Bibcode ADS: | 2011A&A...529A.145D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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aa16128-10.pdf | PDF editoriale | 542.96 kB | Adobe PDF | View/Open |
1103.3647.pdf | arXiv | 689.05 kB | Adobe PDF | View/Open |
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