Simulations on high-z long gamma-ray burst rate
文献类型：期刊论文
| 作者 | Qin, Shu-Fu1; Liang, En-Wei1; Lu, Rui-Jing1; Wei, Jian-Yan2 ; Zhang, Shuang-Nan3,4
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2010-07-21 |
| 卷号 | 406期号:1页码:558-565 |
| 关键词 | instrumentation: detectors stars: evolution stars: formation gamma-ray burst: general stars: luminosity function mass function galaxies: high-redshift |
| 英文摘要 | Since the launch of Swift satellite, the detections of high-z (z > 4) long gamma-ray bursts (LGRBs) have been rapidly growing, even approaching the very early Universe (the record holder currently is z = 8.3). The observed high-z LGRB rate shows significant excess over that estimated from the star formation history. We investigate what may be responsible for this high productivity of GRBs at high-z through Monte Carlo simulations, with effective Swift/Burst Alert Telescope (BAT) trigger and redshift detection probabilities based on current Swift/BAT sample and Compton Gamma-ray Observatory/Burst and Transient Source Experiment LGRB sample. We compare our simulations to the Swift observations via log N - log P, peak luminosity (L) and redshift distributions. In the case that LGRB rate is purely proportional to the star formation rate, our simulations poorly reproduce the LGRB rate at z > 4, although the simulated log N - log P distribution is in good agreement with the observed one. Assuming that the excess of high-z GRB rate is due to the cosmic metallicity evolution or unknown LGRB rate increase parametrized as (1 + z)delta, we find that although the two scenarios alone can improve the consistency between our simulations and observations, incorporation of them gives much better consistency. We get 0.2 < epsilon < 0.6 and delta < 0.6, where epsilon is the metallicity threshold for the production of LGRBs. The best consistency is obtained with a parameter set (epsilon, delta) = (similar to 0.4, similar to 0.4), and BAT might trigger a few LGRBs at z similar or equal to 14. With increasing detections of GRBs at z > 4 (similar to 15 per cent of GRBs in current Swift LGRB sample based on our simulations), a window for very early Universe is opening by Swift and up-coming space-based multiband astronomical variable object monitor missions. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000279766800068 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7701]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 4.Univ Alabama, Dept Phys, Huntsville, AL 35899 USA |
| 推荐引用方式 GB/T 7714 | Qin, Shu-Fu,Liang, En-Wei,Lu, Rui-Jing,et al. Simulations on high-z long gamma-ray burst rate[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,406(1):558-565. |
| APA | Qin, Shu-Fu,Liang, En-Wei,Lu, Rui-Jing,Wei, Jian-Yan,&Zhang, Shuang-Nan.(2010).Simulations on high-z long gamma-ray burst rate.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(1),558-565. |
| MLA | Qin, Shu-Fu,et al."Simulations on high-z long gamma-ray burst rate".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 406.1(2010):558-565. |
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来源：国家天文台
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