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Photospheric emission in gamma-ray bursts
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-9769-8016
2018 (English)In: 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings, World Scientific Publishing Co. Pte. Ltd. , 2018, p. 806-840Conference paper, Published paper (Refereed)
Abstract [en]

A major breakthrough in our understanding of gamma-ray bursts (GRB) prompt emission physics occurred in the last few years, with the realization that a thermal component accompanies the over-all nonthermal prompt spectra. This thermal part is important by itself, as it provides direct probe of the physics in the innermost outflow regions. It further has an indirect importance, as a source of seed photons for inverse-Compton scattering, thereby it contributes to the nonthermal part as well. In this short review, we highlight some key recent developments. Observationally, although so far it was clearly identified only in a minority of bursts, there is indirect evidence that a thermal component exists in a very large fraction of GRBs, possibly close to 100%. Theoretically, the existence of a thermal component has a large number of implications as a probe of underlying GRB physics. Some surprising implications include its use as a probe of the jet dynamics, geometry and magnetization.

Place, publisher, year, edition, pages
World Scientific Publishing Co. Pte. Ltd. , 2018. p. 806-840
Keywords [en]
Gamma-rays bursts, Hydrodynamics, Radiation mechanism: nonthermal, Radiation mechanism: thermal
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-246524Scopus ID: 2-s2.0-85059070608ISBN: 9789813226593 (print)OAI: oai:DiVA.org:kth-246524DiVA, id: diva2:1300764
Conference
14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, 12 July 2015 through 18 July 2015
Note

QC 20190329

Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-03-29Bibliographically approved

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Ryde, Felix

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