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Simulations on high-z long gamma-ray burst rate
Qin, SF; Liang, EW; Lu, RJ; Wei, JY; Zhang, SN; Zhang SN(张双南)
2010
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号406期号:1页码:558-565
通讯作者[Qin, Shu-Fu ; Liang, En-Wei ; Lu, Rui-Jing] Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China ; [Wei, Jian-Yan] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China ; [Zhang, Shuang-Nan] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Zhang, Shuang-Nan] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA
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.
文章类型Article
关键词instrumentation: detectors stars: evolution stars: formation gamma-ray burst: general stars: luminosity function mass function galaxies: high-redshift
学科领域Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2010.16691.x
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000279766800068
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/237947
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Qin, SF,Liang, EW,Lu, RJ,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, SF,Liang, EW,Lu, RJ,Wei, JY,Zhang, SN,&张双南.(2010).Simulations on high-z long gamma-ray burst rate.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,406(1),558-565.
MLA Qin, SF,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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