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The afterglow of GRB 990123 and a dense medium
Dai, ZG; Lu, T
1999
发表期刊ASTROPHYSICAL JOURNAL
卷号519期号:2页码:L155-L158
通讯作者Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China ; Peking Univ, Joint Beijing Astrophys, Chinese Acad Sci, Beijing 100871, Peoples R China ; China Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Lab Cosm Ray & High Energy Astrophys, Beijing, Peoples R China
文章类型Article
摘要Recent observations show that the temporal decay of the R-band afterglow from GRB 990123 steepened about 2.5 days after the burst. We here propose a possible explanation for such a steepening: a shock expanding in a dense medium has undergone the transition from a relativistic phase to a nonrelativistic phase. We find that this model is consistent with the observations if the medium density is about 3 x 10(6) cm(-3). By fitting our model to the observed optical and X-ray afterglow quantitatively, we further infer the electron and magnetic energy fractions of the shocked medium and find that the two parameters are about 0.1 and 2 x 10(-8), respectively. The former parameter is near the equipartition value, while the latter is about 6 orders of magnitude smaller than inferred from the GRB 970508 afterglow. We also discuss possibilities that the dense medium can be produced.
关键词gamma rays : bursts shock waves
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
DOI10.1086/312127
URL查看原文
语种英语
研究领域[WOS]Astronomy & Astrophysics ; Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000081298400013
引用统计
被引频次:94[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240253
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Dai, ZG,Lu, T. The afterglow of GRB 990123 and a dense medium[J]. ASTROPHYSICAL JOURNAL,1999,519(2):L155-L158.
APA Dai, ZG,&Lu, T.(1999).The afterglow of GRB 990123 and a dense medium.ASTROPHYSICAL JOURNAL,519(2),L155-L158.
MLA Dai, ZG,et al."The afterglow of GRB 990123 and a dense medium".ASTROPHYSICAL JOURNAL 519.2(1999):L155-L158.
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