Volume 567, July 2014
|Number of page(s)
|23 July 2014
PKS 1510-089: a rare example of a flat spectrum radio quasar with a very high-energy emission
Nicolaus Copernicus Astronomical Center,
2 Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA
3 CEA Irfu, Centre de Saclay, 91191 Gif-sur-Yvette, France
4 Deutsches Elektronen-Synchrotron (DESY), Platanenallee 6, 15738 Zeuthen, Germany
5 Landessternwarte, Universitat Heidelberg, Konigstuhl 69117, Heidelberg, Germany
Accepted: 18 May 2014
Context. The blazar PKS 1510-089 is an example of flat spectrum radio quasars. High-energy emissions from this class of objects are believed to have been produced by IC radiation with seed photons originating from the broad line region. In such a paradigm, a lack of very high-energy emissions is expected because of the Klein-Nishina effect and strong absorption in the broad line region. Recent detection of at least three such blazars by Cherenkov telescopes has forced a revision of our understanding of these objects.
Aims. We have aimed to model the observed spectral energy distribution of PKS 1510-089 from the high-energy flares in March 2009, during which very high-energy emission were also detected by H.E.S.S.
Methods. We have applied the single-zone internal shock scenario to reproduce the multiwavelength spectrum of PKS 1510-089. We have followed the evolution of the electrons as they propagate along the jet and emit synchrotron and IC radiation. We have considered two sources of external photons: the dusty torus and the broad line region. We have also examined the effects of the gamma-gamma absorption of the high-energy photons both in the AGN environment (the broad line region and the dusty torus), as well as while traveling over cosmological distances: the extragalactic background light.
Results. We have successfully modeled the observed spectrum of PKS 1510-089. In our model, the highest energy emission is the result of the Comptonization of the infrared photons from the dusty torus, thus avoiding Klein-Nishina regime, while the bulk of the emissions in the GeV range may still be dominated by the Comptonization of radiation coming from the broad line region.
Key words: galaxies: jets / galaxies: active / quasars: individual: PKS 1510-089
© ESO, 2014
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