Characteristic Variability Time Scales of Long Gamma-Ray Bursts | Zendy

Rong-Feng Shen | Zendy; L. M. Song | Zendy

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Characteristic Variability Time Scales of Long Gamma-Ray Bursts

Author(s) -

Rong-Feng Shen,

L. M. Song

Publication year - 2003

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/55.2.345

Subject(s) - bimodality , physics , gamma ray burst , astrophysics , time dilation , scale (ratio) , time domain , spectral line , flux (metallurgy) , statistical physics , astronomy , galaxy , theoretical physics , theory of relativity , materials science , quantum mechanics , computer science , metallurgy , computer vision

We determined the characteristic variability time scales (\Delta t_p) of 410bright and long GRBs, by locating the peaks of their Power Density Spectra,defined and calculated in the time domain. We found that the averagedvariability time scale decreases with the peak flux. This is consistent withthe time-dilation effect expected for the cosmological origin of GRBs. We alsofound that the occurrence distribution of the characteristic variability timescale shows bimodality, which might be interpreted as that the long GRB sampleis composed of two sub-classes with different variability time scales. However,we found no difference for some other characteristics of these two sub-classes.Comment: 10 pages, 5 figures, corrected some typos and syntaxes, enlarged the label fonts in fig.3 and fig.

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