A COMPREHENSIVE ANALYSIS OF FERMI GAMMA-RAY BURST DATA. II. Ep EVOLUTION PATTERNS AND IMPLICATIONS FOR THE OBSERVED SPECTRUM-LUMINOSITY RELATIONS

被引：128

作者：

Lu, Rui-Jing ^{[1
,2
]}

Wei, Jun-Jie ^{[1
,2
]}

Liang, En-Wei ^{[1
,2
,3
,4
]}

Zhang, Bin-Bin ^{[5
]}

Lue, Hou-Jun ^{[4
]}

Lu, Lian-Zhong ^{[1
,2
]}

Lei, Wei-Hua ^{[4
,6
]}

Zhang, Bing ^{[4
]}

机构：

[1] Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China

[2] Guangxi Univ, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China

[3] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

[4] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

[5] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[6] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 756卷 / 02期

基金：

美国国家科学基金会;

关键词：

gamma-ray burst: general; methods: statistical; radiation mechanisms: non-thermal; PEAK-ENERGY; LORENTZ-FACTOR; BLACK-HOLES; AFTERGLOW EMISSION; BATSE OBSERVATIONS; PHYSICAL ORIGINS; HUBBLE DIAGRAM; LIGHT CURVES; PULSES; MODELS;

D O I：

10.1088/0004-637X/756/2/112

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a time-resolved spectral analysis of 51 long and 11 short bright gamma-ray bursts (GRBs) observed with the Fermi/Gamma-Ray Burst Monitor, paying special attention to E-p evolution within each burst. Among eight single-pulse long GRBs, five show an evolution from hard to soft, while three show intensity tracking. The multi-pulse long GRBs have more complicated patterns. Statistically, the hard-to-soft evolution pulses tend to be more asymmetric than the intensity-tracking ones, with a steeper rising wing than the falling wing. Short GRBs have E-p tracking intensity exclusively with the 16 ms time-resolution analysis. We performed a simulation analysis and suggest that for at least some bursts, the late intensity-tracking pulses could be a consequence of overlapping hard-to-soft pulses. However, the fact that the intensity-tracking pattern exists in the first pulse of the multi-pulse long GRBs and some single-pulse GRBs, suggests that intensity tracking is an independent component, which may operate in some late pulses as well. For the GRBs with measured redshifts, we present a time-resolved E-p-L-gamma, iso correlation analysis and show that the scatter of the correlation is comparable to that of the global Amati/Yonetoku relation. We discuss the predictions of various radiation models regarding E-p evolution, as well as the possibility of a precessing jet in GRBs. The data pose a great challenge to each of these models, and hold the key to unveiling the physics behind GRB prompt emission.

引用

页数：13

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