| 恒星初始质量分布函数对伽玛暴爆发率的影响 |
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| 引用本文： | 许丛易,韦大明.恒星初始质量分布函数对伽玛暴爆发率的影响[J].天文学报,2008,49(4). |
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| 作者姓名： | 许丛易 韦大明 |
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| 作者单位： | 中国科学院紫金山天文台南京210008 |
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| 基金项目： | 国家自然科学基金，国家"973"项目 |
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| 摘 要： | 伽玛射线暴的产生机制比较公认的是:长暴产生于大质量恒星死亡;短暴产生于密近双星合并.因此人们很自然地推测长暴和恒星形成率直接成比例,但是最近数据分析表明这并不能很好地拟合观测.考虑到只有质量大于某一临界质量的大质量恒星才可能产生长暴,因此恒星初始质量分布函数对长暴的产生率会有较大影响.考虑用恒星初始质量分布函数来解释长暴观测个数随红移的分布,得到了比较好的结果.
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| 关 键 词： | γ射线:暴 恒星:光度函数 质量函数 |
The Effect of the Initial Mass Function on the Burst Rate of GRBs |
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| XU Cong-yi,WEI Da-ming.The Effect of the Initial Mass Function on the Burst Rate of GRBs[J].Acta Astronomica Sinica,2008,49(4). |
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| Authors: | XU Cong-yi WEI Da-ming |
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| Institution: | XU Cong-yi WEI Da-ming Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008 |
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| Abstract: | It has been recognized that the long duration gamma-ray bursts(LGRBs) origi- nate from core collapsing of massive stars and the short duration gamma-ray bursts(SGRBs) originate from merging of tight binary systems.So it is naturally speculated that the LGRBs should follow the star formation rate (SFR),but the recent calculation indicated that the LGRB did not exactly trace the SFR. Since only massive star can produce LGRB,the initial mass function (IMF) should have significant influence on the GRB rate. Her... |
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| Keywords: | Gamma-ray Bursts Stars Luminosity Function Mass Function |
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