与持续射电源相关的快速射电暴偏好贫氢超亮超新星宿主环境
Fast Radio Bursts Associated with Persistent Radio Sources Prefer Hydrogen-poor Superluminous Supernova Host Environments
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中文总结 AI 辅助
研究发现与持续射电源相关的快速射电暴宿主星系偏好贫氢超亮超新星环境，支持低金属丰度大质量恒星形成年轻磁星的起源假说。
中文摘要 AI 辅助
重复快速射电暴（FRBs）的一个子集与致密持续射电源（PRSs）相关。FRB-PRS宿主星系与一般FRB宿主群体存在显著差异：它们不遵循非PRS FRB宿主星系的分布，也不遵循一般恒星形成星系群体所预期的恒星形成率加权或质量加权的模拟宿主分布，而是占据宿主星系参数空间中极低质量、高比恒星形成率（sSFR）和低金属丰度的区域。我们将这些宿主与定义明确的贫氢超亮超新星（SLSNe-I）、富氢超亮超新星（SLSNe-II）和II型核塌缩超新星（CCSNe）样本进行比较。利用累积分布函数和统计检验，我们发现FRB-PRSs倾向于位于具有高比恒星形成率和低气体相位金属丰度的矮星系中，即使相对于相似恒星质量的星系也是如此。它们的宿主与SLSNe-I的宿主最为相似，但与CCSNe宿主显著不同，SLSN-II宿主则介于这两类群体之间。这些结果表明，FRB-PRSs并非简单地追踪恒星形成活动或一般FRB宿主群体，而是偏好SLSN-I型环境。这一偏好与通过低金属丰度大质量恒星通道形成的年轻磁星相一致，对于此类磁星，SLSN-I型抛射物意味着在600 MHz频率下特征自由-自由透明时间约为29年。
英文摘要
A subset of repeating fast radio bursts (FRBs) is associated with compact persistent radio sources (PRSs). The FRB-PRS hosts differ dramatically from the general FRB host population: they do not follow the distribution of localized non-PRS FRB hosts, nor the SFR-weighted or mass-weighted mock host distributions expected for the general star-forming galaxy population, instead occupying the extreme low-mass, high-sSFR, and low-metallicity end of host-galaxy parameter space. We compare these hosts with well-defined samples of hydrogen-poor superluminous supernovae (SLSNe-I), hydrogen-rich superluminous supernovae (SLSNe-II), and Type II core-collapse supernovae (CCSNe). Using cumulative distribution functions and statistical tests, we find that FRB-PRSs tend to reside in dwarf galaxies with high specific star formation rates and low gas-phase metallicities, even relative to galaxies of similar stellar mass. Their hosts are most similar to those of SLSNe-I, but differ significantly from CCSN hosts, with SLSN-II hosts lying between these populations. These results suggest that FRB-PRSs do not simply trace star formation activity or the general FRB host population, but instead favor SLSN-I-like environments. This preference is consistent with young magnetars formed through low-metallicity massive-star channels, for which SLSN-I-like ejecta imply a characteristic free--free transparency time of ~29 yr at 600 MHz.
发表机构
- Tsinghua University（清华大学）
机构由 AI 辅助整理，请以论文原文为准。
