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arXiv 2302.09763astro-ph.SRastro-ph.COastro-ph.GA
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质量最大的第三星族(Population III)恒星

The most massive Population III stars

Teeraparb Chantavat, Siri Chongchitnan, Joseph Silk

AI总结:

本研究基于极值统计构建框架,结合模拟的恒星形成率密度校准效率,计算第三星族恒星丰度与大质量恒星分布,发现红移10-20处最大质量可达10³-10⁴倍太阳质量,为约束恒星初始质量函数提供新方法。

摘要:

詹姆斯·韦布空间望远镜(James Webb Space Telescope)的最新数据表明,在红移约20处探测到第一代恒星具有现实可行性。这些贫金属气态第三星族(Population III,简称Pop III)恒星的质量范围大概率为10-1000倍太阳质量。我们基于极值统计的应用,开发了一套计算Pop III恒星丰度以及质量最大的Pop III恒星分布的框架。我们的计算采用近期模拟得到的恒星形成率密度,来校准恒星形成效率,进而推导Pop III恒星的丰度。我们的极值模型表明,红移10-20处质量最大的Pop III恒星很可能达到≳10³-10⁴ M⊙。这类极端Pop III恒星的数量足够多,可成为高红移处超大质量黑洞的种子,并且可能是可探测引力波的源。我们得出结论,极值形式体系为约束恒星初始质量函数提供了一种有效方法。

英文摘要:

Recent data from the James Webb Space Telescope suggest that there are realistic prospects for detecting the earliest generation of stars at redshift ~20. These metal-poor, gaseous Population III (Pop III) stars are likely in the mass range 10-1000 solar masses. We develop a framework for calculating the abundances of Pop III stars as well as the distribution of the most massive Pop III stars based on an application of extreme-value statistics. Our calculations use the star formation rate density from a recent simulation to calibrate the star-formation efficiency from which the Pop III stellar abundances are derived. Our extreme-value modelling suggests that the most massive Pop III stars at redshifts 10-20 are likely to be $\gtrsim10^3-10^4\,{\rm M}_\odot$. Such extreme Pop III stars were sufficiently numerous to be the seeds of supermassive black holes at high redshifts and possibly source detectable gravitational waves. We conclude that the extreme-value formalism provides an effective way to constrain the stellar initial mass function.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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