Spectral lags of gamma-ray bursts from Ginga and BATSE
Wu BB(吴伯冰); Wu, BB; Fenimore, E
刊名ASTROPHYSICAL JOURNAL
2000
卷号535期号:1页码:L29-L32
关键词gamma rays : bursts
学科分类Astronomy & Astrophysics
DOI10.1086/312700
通讯作者Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA ; Chinese Acad Sci, Inst High Energy Phys, Cosm Ray & High Energy Astrophys Lab, Beijing 100039, Peoples R China
文章类型Article
英文摘要The analysis of spectral lag between energy bands, which combines temporal and spectral analyses, can add strict constraints to gamma-ray burst (GRB) models. In previous studies, the lag analysis focused on the lags between channel 1 (25-57 keV) and channel 3 (115-320 keV) from the Burst and Transient Source Experiment (BATSE). In this Letter, we analyzed the cross-correlation average lags (including approximate uncertainties) between energy bands for two GRB samples: 19 events detected by Ginga and 109 events detected by BATSE. We paid special attention to the BATSE GRBs with known redshifts because there has been a reported connection between lag and luminosity. This extends our knowledge of spectral lags to lower energy (similar to 2 keV). We found that lags between energy bands are small. The lag between the peak of similar to 50 keV photons and that of similar to 200 keV photons is similar to 0.08 s. The upper limit in the lag between similar to 9 and similar to 90 keV photons is similar to 0.5 s. Thus, there are not large shifts at low energy. We found that about 20% of GRBs have detectable lags between energy bands in the Ginga and BATSE samples. From the internal shock model, we found that there are three sources of time structure in GRB pulses: cooling, hydrodynamics, and angular effects. We argue that cooling is much too fast to account for our observed lags and that angular effects are independent of energy. Thus, only hydrodynamics can produce these lags. Perhaps the radiation process varies as the reverse shock moves through the shell.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000087662300008
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240266
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Wu BB,Wu, BB,Fenimore, E. Spectral lags of gamma-ray bursts from Ginga and BATSE[J]. ASTROPHYSICAL JOURNAL,2000,535(1):L29-L32.
APA 吴伯冰,Wu, BB,&Fenimore, E.(2000).Spectral lags of gamma-ray bursts from Ginga and BATSE.ASTROPHYSICAL JOURNAL,535(1),L29-L32.
MLA 吴伯冰,et al."Spectral lags of gamma-ray bursts from Ginga and BATSE".ASTROPHYSICAL JOURNAL 535.1(2000):L29-L32.
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