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Unveiling the origin of X-ray flares in gamma-ray bursts

文献类型：期刊论文

作者Chincarini, G1,2; Mao JR(毛基荣)1,3,4; Margutti, R1,2; Bernardini, MG1,5; Guidorzi, C6; Pasotti, F1; Giannios, D7; Della Valle, M5,8; Moretti, A1; Romano, P9
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2010-08-21
卷号406期号:4页码:2113-2148
关键词radiation mechanisms: non-thermal gamma-ray burst: general X-rays: bursts
ISSN号0035-8711
产权排序第三完成单位
通讯作者Chincarini, G (reprint author), INAF Osservatorio Astron Brera, Via Bianchi 46, I-23807 Merate, LC, Italy.
英文摘要We present an updated catalogue of 113 X-ray flares detected by Swift in the similar to 33 per cent of the X-ray afterglows of gamma-ray burst (GRB). 43 flares have a measured redshift. For the first time the analysis is performed in four different X-ray energy bands, allowing us to constrain the evolution of the flare temporal properties with energy. We find that flares are narrower at higher energies: their width follows a power-law relation w proportional to E-0.5 reminiscent of the prompt emission. Flares are asymmetric structures, with a decay time which is twice the rise time on average. Both time-scales linearly evolve with time, giving rise to a constant rise-to-decay ratio: this implies that both time-scales are stretched by the same factor. As a consequence, the flare width linearly evolves with time to larger values: this is a key point that clearly distinguishes the flare from the GRB prompt emission. The flare 0.3-10 keV peak luminosity decreases with time, following a power-law behaviour with large scatter: L(pk) proportional to t-2.7 +/- 0.5(pk). When multiple flares are present, a global softening trend is established: each flare is on average softer than the previous one. The 0.3-10 keV isotropic energy distribution is a lognormal peaked at 1051 erg, with a possible excess at low energies. The flare average spectral energy distribution is found to be a power law with spectral energy index beta similar to 1.1. These results confirmed that the flares are tightly linked to the prompt emission. However, after considering various models we conclude that no model is currently able to account for the entire set of observations.
WOS标题词Science & Technology ; Physical Sciences
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]INTERNAL SHOCKS ; ENGINE ACTIVITY ; LIGHT CURVES ; RELATIVISTIC TURBULENCE ; TEMPORAL PROPERTIES ; SPECTRAL PROPERTIES ; BATSE OBSERVATIONS ; OPTICAL-EMISSION ; REVERSE SHOCK ; 1ST SURVEY
收录类别SCI
原文出处http://mnras.oxfordjournals.org/content/406/4/2113
语种英语
WOS记录号WOS:000280672600001
源URL[http://ir.ynao.ac.cn/handle/114a53/4994]  
专题云南天文台_高能天体物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.INAF – Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate (LC), Italy
2.Physics Department, University of Milano Bicocca, Piazza della Scienza 3, Milano 20126, Italy
3.Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan Province 650011, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan Province 650011, China
5.CRANet, p.le della Repubblica 10, I-65100 Pescara, Italy
6.Physics Department, University of Ferrara, via Saragat 1, I-44122 Ferrara, Italy
7.Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544, USA
8.INAF – Osservatorio di Capodimonte, Salita Moiariello 16, I-80131 Napoli, Italy
9.INAF – Istituto di Astrofisica Spaziale e Fisica Cosmica, Via La Malfa 153, I-90146 Palermo, Italy
10.ASI Science Data Centre (ASDC), via G. Galilei, I-00044 Frascati (RM), Italy
推荐引用方式
GB/T 7714		 Chincarini, G,Mao JR,Margutti, R,et al. Unveiling the origin of X-ray flares in gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,406(4):2113-2148.
APA Chincarini, G.,Mao JR.,Margutti, R.,Bernardini, MG.,Guidorzi, C.,...&Giommi, P.(2010).Unveiling the origin of X-ray flares in gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(4),2113-2148.
MLA Chincarini, G,et al."Unveiling the origin of X-ray flares in gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 406.4(2010):2113-2148.

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