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arXiv 0710.3099astro-ph
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短伽马射线暴:双峰起源?

Short Gamma Ray Bursts: a bimodal origin?

R. Salvaterra, A. Cerutti, G. Chincarini, M. Colpi, C. Guidorzi, P. Romano

摘要:

短硬伽马射线暴(SGRB)目前被认为是由引力波驱动的双中子星系统的合并产生的,无论是在现场还是动态地在球状星团中形成。对于这两个通道,我们拟合的BATSE SGRB的峰值通量分布,以获得本地爆发形成率和光度函数。然后,我们将所得的红移分布与雨燕2年的数据进行比较,表明为了重现观测结果,需要两个形成通道。在z<0.3时,形成于球状星团中的双中子星占主导地位,而来自原始双星的场粒子数可以解释高z的SGRB。这一结果与观测到的SGRB的宿主星系类型并不矛盾。

英文摘要:

Short-hard Gamma Ray Bursts (SGRBs) are currently thought to arise from gravitational wave driven coalescences of double neutron star systems forming either in the field or dynamically in globular clusters. For both channels we fit the peak flux distribution of BATSE SGRBs to derive the local burst formation rate and luminosity function. We then compare the resulting redshift distribution with Swift 2-year data, showing that both formation channels are needed in order to reproduce the observations. Double neutron stars forming in globular clusters are found to dominate the distribution at z<0.3, whereas the field population from primordial binaries can account for the high-z SGRBs. This result is not in contradiction with the observed host galaxy type of SGRBs.

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