Early afterglow and variability

Kunihito Ioka, Shiho Kobayashi, Bing Zhang, Toma Kenji, Ryo Yamazaki, Takashi Nakamura

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

We show that simple kinematic arguments can give limits on variabilities in gamma-ray burst (GRB) afterglows. These limits are violated by X-ray flares in the early afterglows recently identified by the Swift satellite. We discuss that a probable solution is that the central engine continues to eject an intermittent outflow for a very long timescale up to 1 day. This long-lived engine model may also explain the flat decay of early X-ray afterglows, while the gamma-ray efficiency of GRBs should be incredibly high (>75-90%) in this model. We suggest new possible models to evade this efficiency crisis and discuss implications for future observations.

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301-304
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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