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A test on different types of the time curve of hardness ratio of gamma-ray bursts based on the curvature effect
Jia LW(贾兰伟)1,2; Jia, LW (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
2008-08
卷号8期号:4页码:451-464
DOI10.1088/1009-9271/8/4/09
产权排序第1完成单位
收录类别SCI
关键词Gamma-rays : Bursts Gamma-rays : Observations Methods : Statistical
摘要We analyzed a sample of 66 gamma-ray bursts (GRBs) and statistically confirmed the prediction on the time curve of the hardness ratio of GRBs made by Qin et al. based on the curvature effect. In their analysis, GRB pulses are divided into three types according to the shape of their raw hardness ratio (RHR) time curves, defined as to include the background counts to the signal counts, so as to make use of counts within small time intervals. Of the three types, very hard sources exhibit a perfect pulse-like profile (type I), hard bursts possess a pulse-like profile with a dip in the decay phase (type 2), and soft bursts show no pulse-like profile but have only a dipped profile (type 3). In terms of the conventional hardness ratio, type 3 sources are indeed generally softer than those of type I and type 2, in agreement with the prediction. We found that the minimum value of RHR is sensitive in distinguishing the different types. We propose that GRB pulses can be classified according to the minimum value of RHR and that the different type sources may be connected with different strengths of the shock or/and the magnetic field.
项目资助者National Natural Science Foundation of China(10533050, 10573030)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1009-9271
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WOS记录号WOS:000258698200009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SPECTRAL EVOLUTION ; LIGHT CURVES ; PULSES ; FIREBALLS ; EMISSION ; AFTERGLOWS ; FEATURES ; PLASMA
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7036
专题星系研究组
通讯作者Jia, LW (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/ Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China
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Jia LW,Jia, LW . A test on different types of the time curve of hardness ratio of gamma-ray bursts based on the curvature effect[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(4):451-464.
APA Jia LW,&Jia, LW .(2008).A test on different types of the time curve of hardness ratio of gamma-ray bursts based on the curvature effect.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(4),451-464.
MLA Jia LW,et al."A test on different types of the time curve of hardness ratio of gamma-ray bursts based on the curvature effect".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.4(2008):451-464.
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