Doppler effect of gamma-ray bursts in the fireball framework

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This article has an erratum: [erratum]

Issue		A&A Volume 396, Number 2, December III 2002


Page(s)		705 - 713
Section		Physical and chemical processes
DOI		http://dx.doi.org/10.1051/0004-6361:20021439

A&A 396, 705-713 (2002)
DOI: 10.1051/0004-6361:20021439

Doppler effect of gamma-ray bursts in the fireball framework

Yi-Ping Qin^{1, 2}

¹ Yunnan Observatory, National Astronomical Observatories, CAS, Kunming, Yunnan 650011, PR China
² Chinese Academy of Science-Peking University joint Beijing Astrophysical Center, PR China

(Received 24 June 2002 / Accepted 26 September 2002 )

Abstract
The influence of the Doppler effect in the fireball framework on the spectrum of gamma-ray bursts is investigated. The study shows that the shape of the expected spectrum of an expanding fireball remains almost the same as that of the corresponding rest frame spectrum for constant radiations of the bremsstrahlung, Comptonized, and synchrotron mechanisms as well as for that of the GRB model. The peak flux spectrum and the peak frequency are obviously correlated. When the value of the Lorentz factor becomes 10 times larger, the flux of fireballs would be several orders of magnitude larger. The expansion speed of fireballs is a fundamental factor of the enhancement of the flux of gamma-ray bursts.

Key words: gamma-rays: bursts -- gamma-rays: theory -- radiation mechanisms: nonthermal -- relativity

Offprint request: Y.-P. Qin, ypqin@public.km.yn.cn

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