主要内容:
时标比较长的脉冲比较软，比较暗；脉冲形状越不对称，E_P的演化越厉害。
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| Title: |
| The Temporal and Spectral Characteristics of "Fast Rise and Exponential Decay" Gamma-ray Burst Pulses |
| Authors: |
| Peng, Z. Y.; Yin, Y.; Bi, X. W.; Zhao, X. H.; Fang, L. M.; Bao, Y. Y.; Ma, L. |
| Affiliation: |
| AA(Department of Physics, Yunnan Normal University, Kunming 650092, China pzy@ynao.ac.cn), AB(Department of Physics, Liupanshui Normal College, Liupanshui 553004, China astromali@126.com), AC(Department of Physics, Honghe University, Mengzi 661100, China ), AD(National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China ), AE(Department of Physics, Guangdong Institute of Education, Guangzhou 510303, China ), AF(Department of Physics, Yuxi Normal College, Yuxi 653100, China ), AG(Department of Physics, Yunnan Normal University, Kunming 650092, China ; Author to whom correspondence should be addressed.) |
| Publication: |
| The Astrophysical Journal, Volume 718, Issue 2, pp. 894-898 (2010). (ApJ Homepage) |
| Publication Date: |
| 08/2010 |
| Origin: |
| IOP |
| ApJ Keywords: |
| gamma-ray burst: general, methods: statistical |
| DOI: |
| 10.1088/0004-637X/718/2/894 |
| Bibliographic Code: |
| 2010ApJ...718..894P |
Abstract
In this paper, we have analyzed the temporal and spectral behavior of 52 fast rise and exponential decay (FRED) pulses in 48 long-duration gamma-ray bursts (GRBs) observed by the CGRO/BATSE, using a pulse model with two shape parameters and the Band model with three shape parameters, respectively. It is found that these FRED pulses are distinguished both temporally and spectrally from those in the long-lag pulses. In contrast to the long-lag pulses, only one parameter pair indicates an evident correlation among the five parameters, which suggests that at least four parameters are needed to model burst temporal and spectral behavior. In addition, our studies reveal that these FRED pulses have the following correlated properties: (1) long-duration pulses have harder spectra and are less luminous than short-duration pulses and (2) the more asymmetric the pulses are, the steeper are the evolutionary curves of the peak energy (E
p ) in the νf
ν spectrum within the pulse decay phase. Our statistical results give some constraints on the current GRB models.
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