Poynting flux dominated jets challenged by their photospheric emission

Damien Begue

doi:10.1063/1.4937216

Poynting flux dominated jets challenged by their photospheric emission

Damien Begue

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

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 ≳ 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.

Original language	English
Title of host publication	2nd ICRANet Cesar Lattes Meeting
Subtitle of host publication	Supernovae, Neutron Stars and Black Holes, CL 2015
Editors	Remo Ruffini, Ulisses Barres de Almeida, Gregory Vereshchagin, Cesar Augusto Zen Vasconcellos, Pascal Chardonnet, Rodrigo Picanco Negreiros, Jorge Rueda
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735413405
DOIs	https://doi.org/10.1063/1.4937216
State	Published - 17 Dec 2015
Externally published	Yes
Event	2nd Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015 - Rio de Janeiro, Niteroi, Joao Pessoa, Recife, Fortaleza, Brazil Duration: 13 Apr 2015 → 22 Apr 2015

Publication series

Name	AIP Conference Proceedings
Volume	1693
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	2nd Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015
Country/Territory	Brazil
City	Rio de Janeiro, Niteroi, Joao Pessoa, Recife, Fortaleza
Period	13/04/15 → 22/04/15

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.

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10.1063/1.4937216

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Begue, D. (2015). Poynting flux dominated jets challenged by their photospheric emission. In R. Ruffini, U. Barres de Almeida, G. Vereshchagin, C. A. Z. Vasconcellos, P. Chardonnet, R. P. Negreiros, & J. Rueda (Eds.), 2nd ICRANet Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015 Article 070003 (AIP Conference Proceedings; Vol. 1693). American Institute of Physics Inc.. https://doi.org/10.1063/1.4937216

Begue, Damien. / Poynting flux dominated jets challenged by their photospheric emission. 2nd ICRANet Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015. editor / Remo Ruffini ; Ulisses Barres de Almeida ; Gregory Vereshchagin ; Cesar Augusto Zen Vasconcellos ; Pascal Chardonnet ; Rodrigo Picanco Negreiros ; Jorge Rueda. American Institute of Physics Inc., 2015. (AIP Conference Proceedings).

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abstract = "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 ≳ 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.",

author = "Damien Begue",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.; 2nd Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015 ; Conference date: 13-04-2015 Through 22-04-2015",

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doi = "10.1063/1.4937216",

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Begue, D 2015, Poynting flux dominated jets challenged by their photospheric emission. in R Ruffini, U Barres de Almeida, G Vereshchagin, CAZ Vasconcellos, P Chardonnet, RP Negreiros & J Rueda (eds), 2nd ICRANet Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015., 070003, AIP Conference Proceedings, vol. 1693, American Institute of Physics Inc., 2nd Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015, Rio de Janeiro, Niteroi, Joao Pessoa, Recife, Fortaleza, Brazil, 13/04/15. https://doi.org/10.1063/1.4937216

Poynting flux dominated jets challenged by their photospheric emission. / Begue, Damien.
2nd ICRANet Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015. ed. / Remo Ruffini; Ulisses Barres de Almeida; Gregory Vereshchagin; Cesar Augusto Zen Vasconcellos; Pascal Chardonnet; Rodrigo Picanco Negreiros; Jorge Rueda. American Institute of Physics Inc., 2015. 070003 (AIP Conference Proceedings; Vol. 1693).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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Begue D. Poynting flux dominated jets challenged by their photospheric emission. In Ruffini R, Barres de Almeida U, Vereshchagin G, Vasconcellos CAZ, Chardonnet P, Negreiros RP, Rueda J, editors, 2nd ICRANet Cesar Lattes Meeting: Supernovae, Neutron Stars and Black Holes, CL 2015. American Institute of Physics Inc. 2015. 070003. (AIP Conference Proceedings). doi: 10.1063/1.4937216

Poynting flux dominated jets challenged by their photospheric emission

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