快速射电暴追踪宇宙恒星形成，延迟极小
Fast Radio Bursts Trace Cosmic Star Formation with Little Delay
AI总结：
研究快速射电暴起源，通过正向建模、分层贝叶斯分析CHIME/FRB样本，发现其发生率在与宇宙恒星形成历史相同红移处峰值，平均延迟0.1 - 0.3 Gyr，排除多吉年延迟，指向与年轻恒星遗迹相关的前身系统。
AI中文摘要：
快速射电暴（FRB）的起源渠道仍存在争议，核心问题是其宇宙发生率是迅速追踪恒星形成，还是具有致密双星合并的长时间延迟特征。我们对CHIME/FRB样本进行正向建模、分层贝叶斯分析，联合拟合目录样本、基带流量和局部宿主红移，通过注入框架自洽纳入调查选择函数。在一系列延迟时间模型中，重建的FRB发生率在与宇宙恒星形成历史相同的红移处稳健地达到峰值，平均延迟仅为0.1 - 0.3 Gyr，在2σ水平上与即时零延迟起源一致。这一发现排除了先前报道的多吉年延迟，指向与年轻恒星遗迹相关的前身系统，尤其是核心坍缩超新星中形成的磁星。
英文摘要：
The progenitor channels of fast radio bursts (FRBs) remain debated, with a central question being whether their cosmic rate traces star formation promptly or instead follows it with the long time-delay characteristic of compact-binary mergers. We perform a forward-modeling, hierarchical Bayesian analysis of the CHIME/FRB population, jointly fitting the catalog sample, baseband fluences, and localized host redshifts, while self-consistently incorporating the survey selection function through the injection framework. Across a range of delay-time models, the reconstructed FRB rate robustly peaks at the same redshift as the cosmic star-formation history, with a mean delay of only $0.1-0.3$ Gyr that remains consistent with a prompt, zero-delay origin at the $2σ$ level. For dominant FRB population, this finding rules out the multi-Gyr delays reported previously and interpreted as the evidence for compact binary merger origin, and instead points toward progenitor systems linked to young stellar remnants, most notably magnetars formed in core-collapse supernovae.
