Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect
نویسندگان
چکیده
منابع مشابه
The Hardness Distribution of Gamma-Ray Bursts
It is often stated that gamma-ray bursts (GRBs) have typical energies of several hundreds keV, where the typical energy may be characterized by the hardness H, the photon energy corresponding to the peak of νFν . Among the 54 BATSE bursts analyzed by Band et al. (1993), and 156 analyzed by us, more then 60% have 50keV < H < 300keV. Is the narrow range of H a real feature of GRBs or is it due to...
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The spatial and temporal coincidence of gamma-ray burst (GRB) 980425 and supernova (SN) 1998bw has prompted speculation that there exists a subclass of GRBs produced by SNe (“S-GRBs”). A physical model motivated by radio observations lead us to propose the following characteristics of S-GRBs: (1) prompt radio emission and an implied high brightness temperature close to the inverse Compton limit...
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We predict the redshift distribution of Gamma-Ray Bursts (GRBs) assuming that they trace the cosmic star formation history. We find that a fraction ∼> 50% of all GRBs on the sky originate at a redshift z ∼> 5, even though the fraction of the total stellar mass formed by z ∼ 5 is only ∼ 15%. These two fractions are significantly different because they involve different cosmological factors when ...
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As a result of spherical kinematics, temporal evolution of received gammaray emission should demonstrate signatures of curvature from the emitting shell. Specifically, the shape of the pulse decay must bear a strict dependence on the degree of curvature of the gamma-ray emitting surface. We compare the spectral evolution of the decay of individual GRB pulses to the evolution as expected from cu...
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Aims. An extreme Kerr black hole (BH) surrounded by a precessing disk is invoked to explain the light curves of gamma-ray bursts (GRBs) based on the coexistence of the Blandford-Znajek (BZ) and the magnetic coupling (MC) processes. Methods. The overall shape of the light curves and the duration of GRBs are interpreted by the evolution of the halfopening angle of the magnetic flux on the BH hori...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2006
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.74.063005