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Transparency parameters from relativistically expanding outflows
KTH, School of Engineering Sciences (SCI), Physics. Stockholm University, Sweden.
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 792, no 1, 42- p.Article in journal (Refereed) Published
Abstract [en]

In many gamma-ray bursts a distinct blackbody spectral component is present, which is attributed to the emission from the photosphere of a relativistically expanding plasma. The properties of this component (temperature and flux) can be linked to the properties of the outflow and have been presented in the case where there is no sub-photospheric dissipation and the photosphere is in coasting phase. First, we present the derivation of the properties of the outflow for finite winds, including when the photosphere is in the accelerating phase. Second, we study the effect of localized sub-photospheric dissipation on the estimation of the parameters. Finally, we apply our results to GRB 090902B. We find that during the first epoch of this burst the photosphere is most likely to be in the accelerating phase, leading to smaller values of the Lorentz factor than the ones previously estimated. For the second epoch, we find that the photosphere is likely to be in the coasting phase.

Place, publisher, year, edition, pages
2014. Vol. 792, no 1, 42- p.
Keyword [en]
gamma-ray burst: general, plasmas, radiation mechanisms: thermal
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-152564DOI: 10.1088/0004-637X/792/1/42ISI: 000341172100042ScopusID: 2-s2.0-84906227495OAI: diva2:750927
Available from: 2014-09-30 Created: 2014-09-29 Last updated: 2014-09-30Bibliographically approved

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