التفاصيل البيبلوغرافية
| العنوان: |
A COMPREHENSIVE ANALYSIS OF FERMI GAMMA-RAY BURST DATA. II. E p EVOLUTION PATTERNS AND IMPLICATIONS FOR THE OBSERVED SPECTRUM-LUMINOSITY RELATIONS. |
| المؤلفون: |
Lu, Rui-Jing1, Wei, Jun-Jie1, Liang, En-Wei1,2,3 lew@gxu.edu.cn, Zhang, Bin-Bin4 zhang@physics.unlv.edu, Lü, Hou-Jun3, Lü, Lian-Zhong1, Lei, Wei-Hua3,5, Zhang, Bing3 |
| المصدر: |
Astrophysical Journal. 9/10/2012, Vol. 756 Issue 2, p1-1. 1p. |
| مصطلحات موضوعية: |
*GAMMA ray bursts, *ASTROPHYSICAL radiation, *ASTROPHYSICAL jets, *SIMULATION methods & models, *STATISTICAL correlation |
| مستخلص: |
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 Ep 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 Ep 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 Ep – Lγ, 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 Ep 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. [ABSTRACT FROM AUTHOR] |
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