July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Are gamma rays produced in the core region of microquasars and AGNs?

Jul 31, 2015, 11:30 AM
15m
Amazon (World Forum)

Amazon

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-TH Parallel GA06 TH

Speaker

Behrouz Khiali (University of São Paulo)

Description

Cosmic Ray (CR) acceleration is still challenging in high energy astrophysics. A first-order Fermi mechanism within magnetic reconnection layers has been demonstrated to be a powerful CR accelerator in recent studies. In this work we have investigated this acceleration process in the nuclear region of radio-galaxies and microquasars and found that the very high energy (VHE) emission from these astrophysical sources may be originated in the nuclear region around the central black hole. We employed both lepontic and hadronic models to interpret the observed gamma emission resulting from interactions of accelerated particles by magnetic reconnection with the ambient radiation, magnetic and matter fields. We compared the acceleration rate with the proper cooling rates obtaining the maximum particle energy and then reconstructed the spectral energy distribution (SED) for a few galactic and extragalactic sources and found that the are consistent with the observations. Also this model naturally explains the fast time variability of the emission of these sources.
Registration number following "ICRC2015-I/" 829
Collaboration -- not specified --

Primary author

Behrouz Khiali (University of São Paulo)

Co-authors

Prof. Elisabete de Gouveia Dal Pino (University of Sao Paulo) Prof. Helene Sol (Observatory of Paris-Meudon) Dr Maria del Valle (IAR)

Presentation materials

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