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Thermal and non-thermal emission in gamma-ray bursts: GRB090902B as a case study
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-9769-8016
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-0642-1055
2010 (English)In: Proceedings of Science, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Photospheric (thermal) emission is inherent to the gamma-ray burst (GRB) "fireball" model. Inclusion of this component in the analysis of the GRB prompt emission explains some of the prompt GRB spectra seen by the Fermi satellite over its entire energy band. The sub-MeV peak corresponds to multi-color black body emission, and the high energy tail results from similar contributions of synchrotron emission, synchrotron self Compton (SSC) and Comptonization of the thermal photons by energetic electrons originating after dissipation of the kinetic energy above the photosphere. We study the connection between the thermal and non-thermal parts of the spectrum, and deduce the values of the free model parameters from the data. We demonstrate our analysis method on GRB 090902B.

Place, publisher, year, edition, pages
2010.
Series
Proceedings of Science, ISSN 1824-8039
Keyword [en]
Analysis method, Comptonization, Energetic electron, Gamma ray bursts, High energy tails, Nonthermal emission, Synchrotron emission, Thermal photons, Kinetics, Stars, Gamma rays
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-148903Scopus ID: 2-s2.0-84883886547OAI: oai:DiVA.org:kth-148903DiVA: diva2:738062
Conference
8th INTEGRAL Workshop on the Restless Gamma-Ray Universe, INTEGRAL 2010, 27 September 2010 through 30 September 2010, Dublin Castle, Dublin, Ireland
Note

QC 20140815

Available from: 2014-08-15 Created: 2014-08-14 Last updated: 2014-08-15Bibliographically approved

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Ryde, FelixLundman, Christoffer

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