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Testing the universal structured jet models of gamma-ray bursts with BATSE observations
Cui XH(崔晓红)1,2; Liang EW(梁恩维)1,3,4; Lu RJ(陆睿静)1,2,3; Liang, EW (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2005-08
卷号130期号:2页码:418-424
DOI10.1086/431155
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Assuming that the observed gamma-ray burst (GRB) rate as a function of redshift is proportional to the corrected star formation rate, we derive the empirical distribution of the viewing angles of long BATSE GRBs, P-em(theta), and the distribution of these bursts in the (theta, z)- plane, P-em(theta, z), by using a tight correlation between the collimation-orrected gamma-ray energy (E-gamma) and the peak energy of the vF(v) spectrum measured in the rest frame (E-p'). Our results show that P-em(theta) is well fitted by a lognormal distribution centered at log (theta/1 rad) = -0.76 with a width of sigma(log theta) = 0.57. We test different universal structured jet models by comparing model predictions, P-th(theta) and P-th(theta, z), with our empirical results. To make the comparisons reasonable, an "effective" threshold, which corresponds to the sample selection criteria of the long GRB sample, is used. We find that (1) P-th(theta) predicted by a power-law jet model is consistent with P-em(theta), but P-th(theta, z) predicted by this model is significantly different from P-em(theta, z); (2) P-th(theta, z) predicted by a single-Gaussian jet model is more consistent with P-em(theta, z) than that predicted by the power-law jet model, but P-th(theta) predicted by this model rapidly drops at theta > 0.3 rad and greatly deviates from P-em(theta); and ( 3) both the P-th(theta) and P-th(theta, z) predicted by a two- Gaussian jet model are roughly consistent with our empirical results. A brief discussion shows that cosmological effects on the E-gamma-E-p' relation do not significantly affect our results, but sample selection effects on this relationship might significantly influence our results.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2006-01-08
WOS记录号WOS:000230721600006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]STANDARD ENERGY RESERVOIR ; AFTERGLOW LIGHT CURVES ; PEAK ENERGY ; 2-COMPONENT JET ; VIEWING ANGLE ; SPECTRA ; PREDICTIONS ; BRIGHT ; SPECTROSCOPY ; SIMULATIONS
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6074
专题太阳物理研究组
通讯作者Liang, EW (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.The Graduate School of the Chinese Academy of Sciences, Beijing, China
3.Physics Department, Guangxi University, Nanning 530004, China
4.Physics Department, University of Nevada, Las Vegas, NV 89154
第一作者单位中国科学院云南天文台
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Cui XH,Liang EW,Lu RJ,et al. Testing the universal structured jet models of gamma-ray bursts with BATSE observations[J]. ASTRONOMICAL JOURNAL,2005,130(2):418-424.
APA Cui XH,Liang EW,Lu RJ,&Liang, EW .(2005).Testing the universal structured jet models of gamma-ray bursts with BATSE observations.ASTRONOMICAL JOURNAL,130(2),418-424.
MLA Cui XH,et al."Testing the universal structured jet models of gamma-ray bursts with BATSE observations".ASTRONOMICAL JOURNAL 130.2(2005):418-424.
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