Work

The expected thermal precursors of gamma-ray bursts in the internal shock model

Year: 2002

Type: article

Abstract: The prompt emission of gamma-ray bursts probably comes from a highly relativistic wind which converts part of its kinetic energy into radiation via the formation of shocks within the wind itself. Such ‘internal shocks’ can occur if the wind is generated with a highly non-uniform distribution of the Lorentz factor. We estimate the expected photospheric emission of such a relativistic wind when it becomes transparent. We compare this thermal emission (temporal profile + spectrum) with the non-thermal emission produced by the internal shocks. In most cases, we predict a rather bright thermal emission that should already have been detected. This favours acceleration mechanisms for the wind where the initial energy input is under magnetic rather than thermal form. Such scenarios can produce thermal X-ray precursors comparable to those observed by Ginga and WATCH/GRANAT.

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1046/j.1365-8711.2002.05875.x

Authors: F. Daigne, R. Mochkovitch

Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Max Planck Institute for Astrophysics, CEA Paris-Saclay, Institut d'Astrophysique de Paris

Language: English

Topic: Gamma-ray bursts and supernovae

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,046

OpenAlex ID: W2014398798