Comparing the spectral lag of short and long gamma-ray bursts and its relation with the luminosity

被引：60

作者：

Bernardini, M. G. ^{[1
]}

Ghirlanda, G. ^{[1
]}

Campana, S. ^{[1
]}

Covino, S. ^{[1
]}

Salvaterra, R. ^{[2
]}

Atteia, J. -L. ^{[3
,4
]}

Burlon, D. ^{[5
]}

Calderone, G. ^{[1
]}

D'Avanzo, P. ^{[1
]}

D'Elia, V. ^{[6
,7
]}

Ghisellini, G. ^{[1
]}

Heussaff, V. ^{[3
,4
]}

Lazzati, D. ^{[8
]}

Melandri, A. ^{[1
]}

Nava, L. ^{[9
]}

Vergani, S. D. ^{[10
]}

Tagliaferri, G. ^{[1
]}

机构：

[1] INAF Osservatorio Astron Brera, I-23807 Merate, Italy

[2] INAF IASF Milano, I-20133 Milan, Italy

[3] Univ Toulouse, UPS OMP, IRAP, F-31400 Toulouse, France

[4] CNRS IRAP, F-31400 Toulouse, France

[5] Univ Sydney, Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia

[6] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, RM, Italy

[7] ASI Sci Data Ctr, I-00133 Rome, Italy

[8] Oregon State Univ, Dept Phys, Corvallis, OR 97331 USA

[9] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[10] Univ Paris Diderot, GEPI, Observ Paris, CNRS, F-92190 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 446卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

gamma-ray burst: general; COMPLETE SAMPLE; PROMPT EMISSION; PEAK LUMINOSITY; BRIGHT; EVOLUTION; PULSES; CLASSIFICATION; SPECTROSCOPY; CONNECTION; AFTERGLOWS;

D O I：

10.1093/mnras/stu2153

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigated the rest-frame spectral lags of two complete samples of bright long (50) and short (6) gamma-ray bursts (GRB) detected by Swift. We analysed the Swift/Burst Alert Telescope data through a discrete cross-correlation function fitted with an asymmetric Gaussian function to estimate the lag and the associated uncertainty. We find that half of the long GRBs have a positive lag and half a lag consistent with zero. All short GRBs have lags consistent with zero. The distributions of the spectral lags for short and long GRBs have different average values. Limited by the small number of short GRBs, we cannot exclude at more than 2 sigma significance level that the two distributions of lags are drawn from the same parent population. If we consider the entire sample of long GRBs, we do not find evidence for a lag-luminosity correlation, rather the lag-luminosity plane appears filled on the left-hand side, thus suggesting that the lag-luminosity correlation could be a boundary. Short GRBs are consistent with the long ones in the lag-luminosity plane.

引用

页码：1129 / 1138

页数：10

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