منابع مشابه
Power Density Spectra of Gamma-ray Bursts in the Internal Shock Model
We simulate Gamma-Ray Bursts arising from internal shocks in relativistic winds, calculate their power density spectrum (PDS), and identify the factors to which the PDS is most sensitive: the wind ejection features, which determine the wind dynamics and its optical thickness, and the energy release parameters, which give the pulse 50–300 keV radiative efficiency. For certain combinations of eje...
متن کاملSmoothly Broken Power Law Spectra of Gamma-ray Bursts
A five-parameter expression for a smoothly broken power law is presented. It is used to fit Gamma-Ray Burst spectra observed by BATSE. The function is compared to previously used fourparameter functions, such as a sharply broken power law and the Band et al. (1993) function. The presented function exists as a WINGSPAN routine at http://www.astro.su.se/∼felix/wing.html
متن کاملOn the Power Spectrum Density of Gamma Ray Bursts
Gamma ray bursts (GRBs) are known to have short-time variability and power-law behavior with the index −1.67 in the power spectrum density. Reanalyzing the expanded data, we have found a) the power-law comes from the global profile of the burst and not from the self-similar shots nor rapid fluctuations in the luminosity profile. b) The power indices vary from burst to burst and the value −1.67 ...
متن کاملObservational constraints for power-law spectra of density perturbations
We present an analysis of cosmological models with mixed dark matter (spectrum slope of density perturbations nS ∈ [0.6, 1.6], hot dark matter abundance Ων ∈ [0.0, 0.6]) in spatially flat Universe, based on Press-Schechter formalism (P&S). We found that the models with nS > 1 and Ων < 0.5 are preferable. Additionally, for all considered models we simulated ∆T/T |100 and compared it with the COB...
متن کاملThe spectra of short Gamma–Ray Bursts
We present the results of the spectral analysis of a sample of short bright γ–ray bursts (GRB) detected by BATSE and compare them with the average and time resolved spectral properties of long bright bursts. While the spectral parameters of short GRBs confirm, as expected from previous works based on the hardness ratio, that they are harder than long events, we find that this difference is main...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/308836