Energy dissipation below gamma-ray bursts photosphere: evidence and spectral fits

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dc.contributor.author Pe'er, Asaf
dc.date.accessioned 2019-01-25T12:43:29Z
dc.date.available 2019-01-25T12:43:29Z
dc.date.issued 2015-07
dc.identifier.citation Pe'er, A. (2015) 'Energy dissipation below gamma-ray bursts photosphere: evidence and spectral fits', Proceedings of the Fourteenth Marcel Grossmann Meeting on General Relativity, Rome, Italy, 12-18 July, pp. 2943-2949. Available at: https://doi.org/10.1142/10614 (Accessed 25 January 2019) en
dc.identifier.startpage 2943 en
dc.identifier.endpage 2949 en
dc.identifier.isbn 978-981-3226-59-3
dc.identifier.uri http://hdl.handle.net/10468/7361
dc.description.abstract It is now established that a thermal emission component plays a major role in shaping the prompt spectra of a non-negligible fraction of gamma-ray bursts (GRBs). By studying the properties of this component in a sample of 47 GRBs, we deduce that the Lorentz factor is 102 ≲ Γ ≲ 103, with mean value 〈Γ〉 ≃ 370. The acceleration radius r0 span a wide range, 106.5 ≲ r0 ≲ 109.5 cm, with mean value 〈r0〉 ≃ 108 cm. This is higher than the gravitational radius of 10 M⊙ black hole by a factor of ≈ 30. We argue that this result provides an indirect evidence for jet propagation inside a massive star, and suggests the existence of recollimation shocks that take place at this radius. We further show that sub-photospheric dissipation of the jet kinetic energy provides a self-consistent, fully physically motivated model that can fit a wide range of GRB spectra. The leading radiative process is Comptonization of the thermal component, and synchrotron emission is sub-dominant. We create a DREAM (Dissipation with Radiative Emission as a Table Model) table model for XSPEC, and show how this model can describe different types of GRB spectra. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher World Scientific en
dc.relation.ispartof Fourteenth Marcel Grossmann Meeting on General Relativity
dc.relation.uri https://doi.org/10.1142/10614
dc.rights © 2015, Asaf Pe’er. This paper is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License. Further distribution of this work is permitted, provided the original work is properly cited. en
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ en
dc.subject Gamma-rays en
dc.subject Bursts en
dc.subject Hydrodynamics en
dc.subject Radiation mechanism en
dc.subject Non-thermal en
dc.subject Thermal en
dc.title Energy dissipation below gamma-ray bursts photosphere: evidence and spectral fits en
dc.type Conference item en
dc.internal.authorcontactother Asaf Pe'Er, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: a.peer@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2019-01-25T12:08:00Z
dc.description.version Published Version en
dc.internal.rssid 355792918
dc.description.status Peer reviewed en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.conferencelocation Roem, Italy en
dc.internal.IRISemailaddress a.peer@ucc.ie en


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© 2015, Asaf Pe’er. This paper is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License. Further distribution of this work is permitted, provided the original work is properly cited. Except where otherwise noted, this item's license is described as © 2015, Asaf Pe’er. This paper is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License. Further distribution of this work is permitted, provided the original work is properly cited.
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