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arXiv 2504.08038astro-ph.HE
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快速射电暴的宿主星系追踪恒星质量与恒星形成的组合,类似于Ia型超新星

The Host Galaxies of Fast Radio Bursts Track a Combination of Stellar Mass and Star Formation, Similar to Type Ia Supernovae

Asaf Horowicz, Ben Margalit

AI总结:

本研究开发新统计框架以研究FRB宿主星系,排除其仅追踪恒星形成率、依赖金属丰度或球状星团质量的模型,发现其追踪恒星质量与形成率的组合,与Ia型超新星相似,为前身星研究提供线索。

摘要:

我们开发了一种新的统计框架,用于研究天体物理源的宿主星系,该框架同时考虑了红移演化和宿主星系属性的多变量性质。这些方面在处理跨越广泛红移范围的源,以及/或具有未知红移相关选择效应的源时至关重要。我们将该方法应用于快速射电暴(FRB)宿主星系样本,以探测这些事件的不确定前身星。利用我们的方法,我们能够排除FRB追踪恒星形成率(SFR)的可能性——如果FRB完全与通过核坍缩超新星(SNe)诞生的年轻中子星相关联,这一结果本应是预期的。此外,我们排除了最近提出的一种依赖金属丰度的模型,即FRB仅在氧丰度12+log(O/H)≈8以上时追踪SFR。基于至少一个FRB已被定位于球状星团(GC)的事实,我们还研究了FRB源追踪GC质量的假设,并明确排除了这一情景。相反,我们发现FRB追踪SFR和恒星质量线性组合的‘混合’模型最能解释数据。这种混合模型的优选参数与Ia型超新星的推断参数相似,暗示这些不同暂现源的前身星之间可能存在联系。

英文摘要:

We develop a new statistical framework for studying the host galaxies of astrophysical sources that accounts for both redshift evolution and the multi-variate nature of host-galaxy properties. These aspects are critical when dealing with sources that span a wide range of redshifts, and/or with unknown redshift-dependent selection effects. We apply our method to a sample of Fast Radio Burst (FRB) host-galaxies as a means of probing the uncertain progenitor(s) of these events. Using our method we are able to rule out that FRBs track star-formation rate (SFR), as would be expected if FRBs are associated exclusively with young neutron stars born via core-collapse supernovae (SNe). Furthermore, we rule out a recently proposed metallicity-dependent model whereby FRBs track SFR only above an oxygen abundance of 12+log(O/H) ~ 8. Motivated by the fact that at least one FRB has been localized to a globular cluster (GC), we also investigate the hypothesis that FRB sources track GC mass and explicitly rule out this scenario. Alternatively, we find that a `mixed' model whereby FRBs track a linear combination of both SFR and stellar-mass best explains the data. The preferred parameters of such a mixed model are similar to those inferred for Type Ia SNe, and implies a possible connection between the progenitors of these different transients.

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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