Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » 1103.3647

 Article overview


AGILE detection of extreme gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis
F. D'Ammando ; C. M. Raiteri ; M. Villata ; P. Romano ; G. Pucella ; H. A. Krimm ; S. Covino ; M. Orienti ; G. Giovannini ; S. Vercellone ; E. Pian ; I. Donnarumma ; V. Vittorini ; 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 ; M. Frutti ; F. Fuschino ; M. Galli ; F. Gianotti ; A. Giuliani ; C. Labanti ; I. Lapshov ; F. Lazzarotto ; P. Lipari ; F. Longo ; M. Marisaldi ; S. Mereghetti ; A. Morselli ; L. Pacciani ; A. Pellizzoni ; F. Perotti ; G. Piano ; P. Picozza ; M. Pilia ; G. Porrovecchio ; M. Prest ; M. Rapisarda ; A. Rappoldi ; A. Rubini ; S. Sabatini ; P. Soffitta ; E. Striani ; M. Trifoglio ; A. Trois ; E. Vallazza ; A. Zambra ; D. Zanello ; I. Agudo ; H.D. Aller ; M. F. Aller ; A. A. Arkharov ; U. Bach ; E. Benitez ; A. Berdyugin ; D. A. Blinov ; C. S. Buemi ; W. P. Chen ; A. Di Paola ; M. Dolci ; E. Forne ; L. Fuhrmann ; J. L. Gomez ; M. A. Gurwell ; B. Jordan ; S. G. Jorstad ; J. Heidt ; D. Hiriart ; T. Hovatta ; H. Y. Hsiao ; G. Kimeridze ; T. S. Konstantinova ; E. N. Kopatskaya ; E. Koptelova ; O. M. Kurtanidze ; S. O. Kurtanidze ; V. M. Larionov ; A. Lahteenmaki ; P. Leto ; E. Lindfors ; A. P. Marscher ; B. McBreen ; I. M. McHardy ; D. A. Morozova ; K. Nilsson ; M. Pasanen ; M. Roca-Sogorb ; A. Sillanpaa ; L. O. Takalo ; M. Tornikoski ; C. Trigilio ; I. S. Troitsky ; G. Umana ; L. A. Antonelli ; S. Colafrancesco ; C. Pittori ; P. Santolamazza ; F. Verrecchia ; P. Giommi ; L. Salotti ;
Date 18 Mar 2011
AbstractWe 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.
Source arXiv, 1103.3647
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica