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题名: The X-ray afterglow of GRB 081109A: clue to the wind bubble structure
作者: Jin, Z. P.1, 2; Xu, D.3; Covino, S.4; D'Avanzo, P.4; Antonelli, A.5; Fan, Y. Z.1, 6; Wei, D. M.1
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2009-12-21
卷号: 400, 期号:4, 页码:1829-1834
关键词: radiation mechanisms: non-thermal ; ISM: jets and outflows ; gamma-rays: bursts
学科分类: Astronomy & Astrophysics
DOI: 10.1111/j.1365-2966.2009.15555.x
文章类型: Article
英文摘要: We present the prompt Burst Alert Telescope and afterglow X-ray Telescope data of Swift-discovered GRB 081109A up to similar to 5 x 105 s after the trigger, and the early ground-based optical followups. The temporal and spectral indices of the X-ray afterglow emission change remarkably. We interpret this as the gamma-ray burst jet first traversing the freely expanding supersonic stellar wind of the progenitor with density varying as proportional to r-2. Then, after approximately 300 s the jet traverses into a region of apparent constant density similar to that expected in the stalled-wind region of a stellar wind bubble or the interstellar medium. The optical afterglow data are generally consistent with such a scenario. Our best numerical model has a wind density parameter A(*) similar to 0.02, a density of the stalled wind n similar to 0.12 cm-3 and a transition radius similar to 4.5 x 1017 cm. Such a transition radius is smaller than that predicted by numerical simulations of the stellar wind bubbles and may be due to a rapidly evolving wind of the progenitor close to the time of its core-collapse.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: BURST AFTERGLOWS ; MASSIVE STARS ; REVERSE SHOCK ; LIGHT CURVES ; TELESCOPE ; REM ; PROGENITORS ; ENVIRONMENT ; MODELS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000272532100016
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/1607
Appears in Collections:宇宙伽马暴、中子星及相关物理研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100012, Peoples R China
3.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark
4.INAF Brera Astron Observ, I-23807 Merate, LC, Italy
5.INAF Rome Astron Observ, I-00044 Rome, Italy
6.Univ Copenhagen, Niels Bohr Inst, Niels Bohr Int Acad, DK-2100 Copenhagen, Denmark

Recommended Citation:
Jin Z. P.; Xu D.; Covino S.;.The X-ray afterglow of GRB 081109A: clue to the wind bubble structure ,MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY  ,2009,400(4):1829-1834
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文件名: 2009002The X ray afterglow of GRB 081109A clue to the wind bubble structure .pdf
格式: Adobe PDF
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