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Poynting flux domin...
Poynting flux dominated jets challenged by their photospheric emission
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- Begué, Damien (författare)
- KTH,Partikel- och astropartikelfysik,Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, Stockholm, Sweden
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(creator_code:org_t)
- American Institute of Physics (AIP), 2015
- 2015
- Engelska.
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Ingår i: SECOND ICRANET CESAR LATTES MEETING. - : American Institute of Physics (AIP). - 9780735413405
- Relaterad länk:
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http://arxiv.org/pdf...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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visa färre...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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