由低光度伽玛暴揭示的低红移事件速率过剩的起源

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
X. F. Dong, Z. B. Zhang, Q. M. Li, Y. F. Huang, K. Bian
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引用次数: 0

摘要

长伽马暴的事件速率与恒星形成速率之间的关系仍然存在争议,特别是在低红移端。Dong等人证实,在z <的低红移处,伽马射线爆发速率总是超过恒星形成速率;1,尽管样本的完整性。然而,低红移过剩的原因仍然不清楚。由于低光度暴通常红移较小,我们选择了3个Swift长暴样本,并将其分为低光度暴和高光度暴,以检验是否存在低红移过剩,以及过剩是否受样本大小和完整性的影响。为了从光度退化红移演化,我们采用非参数方法研究了每个样本中两类长暴的事件率。研究发现,在整个红移范围内,高亮度爆发率与恒星形成率一致,而在z <低红移范围内,低亮度爆发的事件率超过了恒星形成率;1. 因此,我们得出结论,低红移过剩是由可能与恒星形成无关的新起源的低光度爆发贡献的,这也与样本大小和样本完整性无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Origin of Low-redshift Event Rate Excess as Revealed by the Low-luminosity Gamma-Ray Bursts
Abstract The relation between the event rate of long gamma-ray bursts and the star formation rate is still controversial, especially at the low-redshift end. Dong et al. confirmed that the gamma-ray burst rate always exceeds the star formation rate at a low redshift of z < 1 in spite of the sample completeness. However, the reason for low-redshift excess is still unclear. Since low-luminosity bursts are at smaller redshifts generally, we choose three Swift long burst samples and classify them into low- and high-luminosity bursts in order to check whether the low-redshift excess is existent and if the excess is biased by the sample size and completeness. To degenerate the redshift evolution from luminosity, we adopt the nonparametric method to study the event rate of the two types of long bursts in each sample. It is found that the high-luminosity burst rate is consistent with the star formation rate within the whole redshift range, while the event rate of low-luminosity bursts exceeds the star formation rate at a low redshift of z < 1. Consequently, we conclude that the low-redshift excess is contributed by the low-luminosity bursts with possibly new origins unconnected with the star formation, which is also independent of the sample size and the sample completeness.
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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