Shallow decay of early X-ray afterglows from inhomogeneous gamma-ray burst jets

K. Toma, K. Ioka, R. Yamazaki, T. Nakamura

研究成果: Conference contribution

抄録

Almost all the X-ray afterglows of gamma-ray bursts (GRBs) observed by the Swift satellite have a shallow decay phase in the first thousands of seconds. We show that in an inhomogeneous jet (multiple-subjet or patchy-shell) model the superposition of the afterglows of off-axis subjets (patchy shells) can have the shallow decay phase. The necessary condition for obtaining the shallow decay phase is that γ-ray bright subjets (patchy shells) should have γ-ray efficiency higher than previously estimated, and should be surrounded by γ-ray dim subjets (patchy shells) with low γ-ray efficiency. Our model predicts that events with dim prompt emission have the conventional afterglow light curve without the shallow decay phase like GRB 050416A.

本文言語English
ホスト出版物のタイトルGAMMA-RAY BURSTS IN THE SWIFT ERA
ホスト出版物のサブタイトルSixteenth Maryland Astrophysics Conference
ページ337-340
ページ数4
DOI
出版ステータスPublished - 2006 5月 19
外部発表はい
イベントGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C., United States
継続期間: 2005 11月 292005 12月 2

出版物シリーズ

名前AIP Conference Proceedings
836
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Conference

ConferenceGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference
国/地域United States
CityWashington, D.C.
Period05/11/2905/12/2

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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