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AGILE detection of a rapid gamma-ray flare from the blazar PKS 1510-089 during the GASP-WEBT monitoring | | F. D'Ammando
; G. Pucella
; C. M. Raiteri
; M. Villata
; V. Vittorini
; S. Vercellone
; I. Donnarumma
; F. Longo
; M. Tavani
; A. Argan
; G. Barbiellini
; F. Boffelli
; A. Bulgarelli
; P. Caraveo
; P. W. Cattaneo
; A. W. Chen
; V. Cocco
; E. Costa
; E. Del Monte
; G. De Paris
; G. Di Cocco
; Y. Evangelista
; M. Feroci
; A. Ferrari
; M. Fiorini
; T. Froysland
; F. Fuschino
; M. Galli
; F. Gianotti
; A. Giuliani
; C. Labanti
; I. Lapshov
; F. Lazzarotto
; P. Lipari
; M. Marisaldi
; S. Mereghetti
; A. Morselli
; L. Pacciani
; A. Pellizzoni
; F. Perotti
; G. Piano
; P. Picozza
; M. Pilia
; M. Prest
; M. Rapisarda
; A. Rappoldi
; S. Sabatini
; P. Soffitta
; M. Trifoglio
; A. Trois
; E. Vallazza
; A. Zambra
; D. Zanello
; I. Agudo
; M. F. Aller
; H. D. Aller
; A. A. Arkharov
; U. Bach
; E. Benitez
; A. Berdyugin
; D. A. Blinov
; C. S. Buemi
; W. P. Chen
; A. Di Paola
; G. Di Rico
; D. Dultzin
; L. Fuhrmann
; J. L. Gomez
; M. A. Gurwell
; S. G. Jorstad
; J. Heidt
; D. Hiriart
; H. Y. Hsiao
; G. Kimeridze
; T. S. Konstantinova
; E. N. Kopatskaya
; E. Koptelova
; O. Kurtanidze
; V. M. Larionov
; P. Leto
; E. Lindfors
; J. M. Lopez
; A. P. Marscher
; I. M. McHardy
; D. A. Melnichuk
; M. Mommert
; R. Mujica
; K. Nilsson
; M. Pasanen
; M. Roca-Sogorb
; M. Sorcia
; L. O. Takalo
; B. Taylor
; C. Trigilio
; I. S. Troitsky
; G. Umana
; L. A. Antonelli
; S. Colafrancesco
; S. Cutini
; D. Gasparrini
; C. Pittori
; B. Preger
; P. Santolamazza
; F. Verrecchia
; P. Giommi
; L. Salotti
; | | Date: |
18 Sep 2009 | | Abstract: | We report the detection by the AGILE satellite of a rapid gamma-ray flare
from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on
the Galactic Center region from 1 March to 30 March 2008. This source has been
continuosly monitored in the radio-to-optical bands by the GLAST-AGILE Support
Program (GASP) of the Whole Earth Blazar Telescope (WEBT). Moreover, the
gamma-ray flaring episode triggered three ToO observations by the Swift
satellite in three consecutive days, starting from 20 March 2008. In the period
1-16 March 2008, AGILE detected gamma-ray emission from PKS 1510-089 at a
significance level of 6.2-sigma with an average flux over the entire period of
(84 +/- 17) x 10^{-8} photons cm^{-2} s^{-1} for photon energies above 100 MeV.
After a predefined satellite re-pointing, between 17 and 21 March 2008, AGILE
detected the source at a significance level of 7.3-sigma, with an average flux
(E > 100 MeV) of (134 +/- 29) x 10^{-8} photons cm^{-2} s^{-1} and a peak level
of (281 +/- 68) x 10^{-8} photons cm^{-2} s^{-1} with daily integration. During
the observing period January-April 2008, the source also showed an intense and
variable optical activity, with several flaring episodes and a significant
increase of the flux was observed at millimetric frequencies. Moreover, in the
X-ray band the Swift/XRT observations seem to show an harder-when-brighter
behaviour of the source spectrum. The spectral energy distribution of mid-March
2008 is modelled with a homogeneous one-zone synchrotron self Compton emission
plus contributions from inverse Compton scattering of external photons from
both the accretion disc and the broad line region. Indeed, some features in the
optical-UV spectrum seem to indicate the presence of Seyfert-like components,
such as the little blue bump and the big blue bump. | | Source: | arXiv, 0909.3484 | | Services: | Forum | Review | PDF | Favorites | |
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