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Poynting flux dominated jets challenged by their photospheric emission
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, Stockholm, Sweden.
2015 (English)In: SECOND ICRANET CESAR LATTES MEETING: SUPERNOVAE, NEUTRON STARS AND BLACK HOLES, American Institute of Physics (AIP), 2015, UNSP 070003Conference paper (Refereed)Text
Abstract [en]

One of the key open question for gamma-ray bursts (GRBs) jets, is the magnetization of the outflow. Here we consider the photospheric emission of Poynting flux dominated outflows, when the dynamics is mediated by magnetic reconnection. We show that thermal three-particle processes, responsible for the thermalization of the plasma, become inefficient far below the photosphere. Conservation of the total photon number above this radius, combined with Compton scattering below the photosphere enforces kinetic equilibrium between electrons and photons. This, in turn, leads to an increase in the observed photon temperature, which reaches greater than or similar to 8 MeV (observed energy) when decoupling the plasma at the photosphere. This result is weakly dependent on the free model parameters. The predicted peak energy is more than an order of magnitude higher than the observed peak energy of most GRBs, which puts strong constraints on the magnetization of these outflows.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. UNSP 070003
, AIP Conference Proceedings, ISSN 0094-243X ; 1693
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-184598DOI: 10.1063/1.4937216ISI: 000371596000038ISBN: 978-0-7354-1340-5OAI: diva2:916346
2nd ICRANet Cesar Lattes Meeting - Supernovae, Neutron Stars and Black Holes, APR 13-22, 2015, Rio De Janeiro, BRAZIL

QC 20160401

Available from: 2016-04-01 Created: 2016-04-01 Last updated: 2016-04-01Bibliographically approved

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Begué, Damien
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