1307.1779 (A. Barnacka et al.)

PKS 1510-089 - a rare example of a flat spectrum radio quasar with very high energy emission    [PDF]

A. Barnacka, R. Moderski, B. Behera, P. Brun, S. Wagner

The blazar PKS 1510-089 is an example of the so-called flat spectrum radio quasars for which no very high energy emission is expected due to the Klein-Nishina effects 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. We have aimed to model the observed spectral energy distribution of PKS 1510-089 during the high energy and very high energy flares in March 2009. 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 inverse Compton 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 absorption of the high energy photons both in the broad line region and on extragalactic background light. 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 emission in the GeV range is still dominated by the Comptonization of radiation coming from the broad line region.

View original: http://arxiv.org/abs/1307.1779