Shallow Decay of Early X-Ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets
The Astrophysical Journal Volume 640 Issue 2
Page L139-L142
published_at 2006-04
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| File | |
| Title ( eng ) |
Shallow Decay of Early X-Ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets
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| Creator |
Toma Kenji
Ioka Kunihito
Yamazaki Ryo
Nakamura Takashi
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| Source Title |
The Astrophysical Journal
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| Volume | 640 |
| Issue | 2 |
| Start Page | L139 |
| End Page | L142 |
| 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.
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| NDC |
Astronomy. Space sciences [ 440 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
The American Astronomical Society
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| Date of Issued | 2006-04 |
| Rights |
Copyright (c) 2006. The American Astronomical Society
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0004-637X
[DOI] 10.1086/503384
[DOI] http://dx.doi.org/10.1086/503384
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