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Spectral lags caused by the curvature effect of fireballs
Lu RJ(陆睿静)1,2,3; Tan YP(覃一平)1,2; Zhang ZB(张志彬)1,3; Yi, TF2; Lu, RJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006-03-21
卷号367期号:1页码:275-289
DOI10.1111/j.1365-2966.2005.19951.x
产权排序第1完成单位
收录类别SCI
关键词Relativity Gamma-rays : Bursts Gamma-rays : Theory
摘要Recently, Shen et al. have studied the contributions of the curvature effect of fireballs to the spectral lag and have shown that the observed lags can be accounted for by the effect. Here, we check their results by performing a more precise calculation with both formulae presented by Shen et al. and Qin et al. Several other aspects which were not considered by Shen et al. are investigated. We find that in the case of ultrarelativistic motions, both formulae are identical as long as the whole fireball surface is concerned. In our analysis, the previous conclusion that the detected spectral lags can be accounted for by the curvature effect is confirmed, while the conclusion that the lag has no dependence on the radius of fireballs is not true. We find that introducing extreme physical parameters is not the only outlet to explain these observed large lags. Even for the larger lags (similar to 5 s), a wider local pulse (Delta t(theta,FWHM)= 10(7) s) can account for it. Some conclusions not presented in Shen et al. or those modified in our analysis are listed below: (i) lag proportional to Gamma(-epsilon) with epsilon > 2; (ii) lag is proportional to the local pulse width and the full width at half-maximum of the observed light curves; (iii) a large lag requires a large alpha(0) and a small beta(0) as well as a large E-0,E-p; (iv) when the rest-frame spectrum varies with time, the lag would become larger; (v) lag decreases with the increase of R-c; (vi) lag proportional to E within the certain energy range for a given Lorentz factor; (vii) lag is proportional to the opening angle of uniform jets when theta(j) < 0.6 Gamma(-1).
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2006-06-21
WOS记录号WOS:000235939700038
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA-RAY BURSTS ; BATSE OBSERVATIONS ; PEAK LUMINOSITY ; PULSE-WIDTH ; ENERGY ; BRIGHT ; SPECTROSCOPY ; EVOLUTION ; CONNECTION ; CATALOG
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7005
专题星系研究组
通讯作者Lu, RJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China
2.Physics Department, Guangxi University, Nanning, Guangxi 530004, China
3.The Graduate School of the Chinese Academy of Sciences
推荐引用方式
GB/T 7714
Lu RJ,Tan YP,Zhang ZB,et al. Spectral lags caused by the curvature effect of fireballs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,367(1):275-289.
APA Lu RJ,Tan YP,Zhang ZB,Yi, TF,&Lu, RJ .(2006).Spectral lags caused by the curvature effect of fireballs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,367(1),275-289.
MLA Lu RJ,et al."Spectral lags caused by the curvature effect of fireballs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 367.1(2006):275-289.
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