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ID 17238
file
creator
Yamazaki, Ryo
Toma, Kenji
Ioka, Kunihito
Nakamura, Takashi
subject
gamma rays
bursts - gamma rays
theory
NDC
Astronomy. Space sciences
abstract
Tail emission of the prompt gamma-ray burst (GRB) is discussed using a multiple emitting sub-shell (inhomogeneous jet, sub-jets or mini-jets) model, where the whole GRB jet consists of many emitting sub-shells. One may expect that such a jet with angular inhomogeneity should produce spiky tail emission. However, we found that the tail is not spiky but is decaying roughly monotonically. The global decay slope of the tail is not so much affected by the local angular inhomogeneity but affected by the global sub-shell energy distribution. The fact that steepening breaks appeared in some events prefers the structured jets. If the angular size of the emitting sub-shell is around 0.01-0.02 rad, some bumps or fluctuations appear in the tail emission observed frequently in long GRBs. If the parameter differences of sub-shell properties are large, the tail has frequent changes of the temporal slope observed in a few bursts. Therefore, the multiple emitting sub-shell model has the advantage of explaining the small-scale structure in the observed rapid decay phase.
journal title
Monthly Notices of the Royal Astronomical Society
volume
Volume 369
issue
Issue 1
start page
311
end page
316
date of issued
2006-06-01
publisher
Blackwell Publishing Ltd
issn
0035-8711
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Blackwell Publishing. The definitive version is available at www.blackwell-synergy.com
relation is version of URL
http://dx.doi.org/10.1111/j.1365-2966.2006.10290.x
department
Graduate School of Science