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On the spectral lags of the short gamma-ray bursts
Yi, TF1; Liang, EW1,2; Tan YP(覃一平)1,3; Lu RJ(陆睿静)1,3,4; Yi, TF (reprint author), Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China.
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006-04-21
Volume367Issue:4Pages:1751-1756
DOI10.1111/j.1365-2966.2006.10083.x
Contribution Rank第3完成单位
Indexed BySCI
KeywordMethods : Statistical Gamma-rays : Bursts Gamma-rays : Observations
AbstractWe present a detailed analysis on the spectral lags of the short gamma-ray bursts (GRBs) and compare them with that of the long GRBs by using the CGRO (Compton Gamma-ray Observatory)/BATSE GRB catalogue. Our sample includes 308 short GRBs and 1008 long GRBs. The light curves of these GRBs are in 64-ms time bin and they have at least one long and intense pulse, which satisfies delta T >= 0.512 s at c= 1 sigma and c(max)>= 6 sigma, where delta T is the pulse duration, c is the photon counts and sigma is the standard error of the background. We calculate the cross-correlation function (CCF) for the light curves in 25-55 and 110-300 keV bands and derive the spectral lag by fitting the CCF with the Gaussian model. Our results are as follows. (i) The spectral lag distribution of the short GRBs is significantly different from that of the long GRBs. Excluding the statistical fluctuation effect, a proportion of similar to 17 per cent of the short GRBs has a negative spectral lag, i.e. the hard photons are being lag behind the soft photons. We do not find any peculiar features from their light curves to distinguish these bursts from those with a positive spectral lag. We argue that a more physical mechanism dominated the hard lag may be hid behind the morphological features of the light curves. This should be a great challenge to the current GRB models. We note that this proportion is consistent with the proportion of short GRBs correlated with nearby galaxies newly discovered by Tanvir et al., although it is unclear if these short GRBs are indeed associated with the sources originated at low redshift. (ii) While the spectral lags of the long GRBs are strongly correlated with the pulse durations, they are not for the short GRBs. However, the ratios of the spectral lag to the pulse duration for the short and long GRBs are normal distributions at 0.023 and 0.046, respectively, with the sample width, indicating that the curvature effect alone could not explain the difference of the spectral lags between the two types of GRBs. The hydrodynamic time-scales of the outflows and the radiative processes at work in GRBs might also play an important role as suggested by Daigne and Mochkovitch.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0035-8711
URL查看原文
WOS IDWOS:000236606400040
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS Keyword1ST 2 SECONDS ; HARDNESS RATIO ; PEAK LUMINOSITY ; SHORT-DURATION ; LIGHT CURVES ; HOST GALAXY ; AFTERGLOW ; LONG ; TIME ; SUPERNOVA
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7004
Collection星系研究组
Corresponding AuthorYi, TF (reprint author), Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China.
Affiliation1.Physics Department, Guangxi University, Nanning 530004, China
2.Physics Department, University of Nevada, Las Vegas, NV 89154, USA
3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
4.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
Yi, TF,Liang, EW,Tan YP,et al. On the spectral lags of the short gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,367(4):1751-1756.
APA Yi, TF,Liang, EW,Tan YP,Lu RJ,&Yi, TF .(2006).On the spectral lags of the short gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,367(4),1751-1756.
MLA Yi, TF,et al."On the spectral lags of the short gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 367.4(2006):1751-1756.
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