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| 具平缓电子能谱的伽玛射线暴的解析光变曲线 | |
| 引用本文： | 王瑜,范一中,韦大明,COVINO Stefano.具平缓电子能谱的伽玛射线暴的解析光变曲线[J].天文学报,2011,52(6):460-466. |
| 作者姓名： | 王瑜 范一中 韦大明 COVINO Stefano |
| 作者单位： | 1. 中国科学院紫金山天文台 南京210008;中国科学院暗物质与空间天文重点实验室 南京210008;中国科学院研究生院 北京100049 2. 中国科学院紫金山天文台 南京210008;2中国科学院暗物质与空间天文重点实验室 南京210008;紫金山天文台-南京大学粒子、核物理和宇宙学联合研究中心 南京210008 3. 中国科学院紫金山天文台 南京210008;2中国科学院暗物质与空间天文重点实验室 南京210008 4. National Institute for Astrophysics/Brera Astronomical Observatory, Merate 23807, Italy |
| 基金项目： | 国家自然科学基金项目，国家重点基础研究发展规划 |
| 摘 要： | 在标准的伽玛暴余辉模型中,电子通过费米一级加速后形成单幂律能谱分布dn/dγe∝γe-p(p≈2.3),但在某些伽玛暴事件中观测到了平缓的电子能谱分布(即p＜2).在单幂律谱和分段幂律谱两种情况下,分别给出了具有平缓电子能谱的伽玛暴余辉的解析光变曲线,并以GRB 060908为例进行了讨论.同时提出了伽玛暴低能谱危机的... |
| 关 键 词： | 伽玛射线暴:普通 星际介质:喷流和外流 辐射机制:非热 |
Analytical Afterglow Lightcurves of Gamma-ray Bursts: the Case of a Flat Electron Spectrum |
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| WANG Yu,FAN Yi-zhong,WEI Da-ming,COVINO Stefano.Analytical Afterglow Lightcurves of Gamma-ray Bursts: the Case of a Flat Electron Spectrum[J].Acta Astronomica Sinica,2011,52(6):460-466. | |
| Authors: | WANG Yu FAN Yi-zhong WEI Da-ming COVINO Stefano |
| Institution: | WANG Yu~(1,2,3) FAN Yi-zhong~(1,2) WEI Da-ming~(1,4) COVINO Stefano~5 (1 Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008) (2 Key Laboratory of Dark Matter and Space Astronomy,Nanjing 210008) (3 Graduate University of Chinese Academy of Sciences,Beijing 100049) (4 Joint Center for Particle,Nuclear Physics and Cosmology of Purple Mountain Observatory - Nanjing University,Nanjing 210008) (5 Brera Astronomical Observatory,National Institute for Astrophysics,M... |
| Abstract: | In the standard afterglow model,the swept electrons have been accelerated to a single power-law energy distribution dn/dγeαγe-p（p≈2.3）,as expected in the first-order Fermi acceleration process.However,in some events people find evidences for a flat electron spectrum（i.e.,p<2）.In this work the analytical afterglow lightcurves are presented in the case of a flat electron spectrum.The possibilities that the injected electrons take a single power-law or a broken power-law function are discussed.The results have been applied to the specific burst GRB 060908.We also speculated a possible solution of the so-called low-energy spectrum crisis of gamma-ray bursts. |
| Keywords: | gamma-ray burst:general ISM:jets and outflows radiation mechanisms nonthermal |
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