Gamma-ray burst spectral parameters within the fireball model
نویسندگان
چکیده
منابع مشابه
Gamma-ray Bursts and the Fireball Model
Gamma-ray bursts (GRBs) have puzzled astronomers since their accidental discovery in the late sixties. The BATSE detector on the COMPTON-GRO satellite has been detecting one burst per day for the last six years. Its findings have revolutionized our ideas about the nature of these objects. They have shown that GRBs are at cosmological distances. This idea was accepted with difficulties at first....
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It is shown that differential Doppler shift of different patches of the blastwave front in the fireball model at varying angles to the line of sight could provide an intrinsic smoothing mechanism for the spectra of gamma-ray bursts (GRBs) and the associated afterglows at lower energy bands. For the model parameters of interest, it is illustrated that a monochromatic spectrum at ν in blastwave c...
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The recent detection of delayed X-ray and optical emission, “afterglow,” associated with γ-ray bursts (GRBs) supports models, where the bursts are produced by relativistic expanding blastwaves, “fireballs,” at cosmological distances. The detection of absorption lines in the optical afterglow of the GRB of 8 May 1997 confirms that the sources lie at cosmological distance. We show here that the n...
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We propose a physical model of gamma-ray burst spectral evolution in which impulsively accelerated nonthermal leptons cool by saturated Compton upscattering of soft photons. This model naturally explains the recently discovered exponential decay of the spectral break energy with photon fluence, the hard-to-soft spectral evolution patterns, and other spectral and temporal properties of gamma-ray...
متن کاملThe Fireball Shock Model of Gamma Ray Bursts
Gamma-ray bursts are thought to be the outcome of a cataclysmic event leading to a relativistically expanding fireball, in which particles are accelerated at shocks and produce nonthermal radiation. We discuss the theoretical predictions of the fireball shock model and its general agreement with observations. Some of the recent work deals with the collimation of the outflow and its implications...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.16712.x