A possible origin of bimodal distribution of gamma-ray bursts
Astrophysical Journal Volume 620 Issue 2
Page 835-839
published_at 2005-02
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| File | |
| Title ( eng ) |
A possible origin of bimodal distribution of gamma-ray bursts
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| Creator |
Toma Kenji
Yamazaki Ryo
Nakamura Takashi
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| Source Title |
Astrophysical Journal
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| Volume | 620 |
| Issue | 2 |
| Start Page | 835 |
| End Page | 839 |
| Abstract |
We study the distribution of the durations of gamma-ray bursts (GRBs) in the unified model of short and long GRBs recently proposed by Yamazaki, Ioka, and Nakamura. Monte Carlo simulations show clear bimodal distributions, with lognormal- like shapes for both short and long GRBs, in a power-law as well as a Gaussian angular distribution of the subjets. We find that the bimodality comes from the existence of the discrete emission regions ( subjets or patchy shells) in the GRB jet. To explain other temporal properties of short and long GRBs, the subjet parameters should depend on the angle in the whole jet.
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| NDC |
Astronomy. Space sciences [ 440 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
University of Chicago Press
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| Date of Issued | 2005-02 |
| Rights |
Copyright (c) 2005 The American Astronomical Society
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0004-637X
[DOI] 10.1086/427179
[DOI] http://dx.doi.org/10.1086/427179
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