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ID 14768
file
creator
Toma, Kenji
Ioka, Kunihito
Yamazaki, Ryo
Nakamura, Takashi
NDC
Astronomy. Space sciences
abstract
Almost all the X-ray afterglows of γ-ray bursts (GRBs) observed by the Swift satellite have a shallow decay phase in their first few thousand seconds. We show that in an inhomogeneous-jet model (multiple-subjet or patchy-shell), the superposition of the afterglows of off-axis subjets (patchy shells) can produce the shallow decay phase. The necessary condition for obtaining the shallow decay phase is that γ-ray–bright subjets (patchy shells) have γ-ray efficiencies higher than previously estimated and that they be surrounded by γ-ray–dim subjets (patchy shells) with low γ-ray efficiency. Our model predicts that events with dim prompt emission will have a conventional afterglow light curve without a shallow decay phase, like GRB 050416A.
journal title
The Astrophysical Journal
volume
Volume 640
issue
Issue 2
start page
L139
end page
L142
date of issued
2006-04
publisher
The American Astronomical Society
issn
0004-637X
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006. The American Astronomical Society
relation is version of URL
http://dx.doi.org/10.1086/503384
department
Graduate School of Science