星系团方向快速射电暴发生率增强的证据
Evidence for Enhancement in the Rate of Fast Radio Bursts Toward Galaxy Clusters
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中文总结 AI 辅助
该研究发现CHIME/FRB基带第二星表中与星系团关联的FRB数量呈3σ增强，占该星表FRB的1.4±0.4%，或由成员星系FRB与引力透镜共同导致，为研究FRB前身星及高红移演化提供新途径。
中文摘要 AI 辅助
大质量星系团会在视线方向引入引力透镜效应以及恒星形成受抑制的成员星系群体，可能改变该方向可观测源的分布，使其不同于平均天区的分布。因此，与星系团对齐的快速射电暴（FRB）能为探索FRB群体的参数空间提供其他视线方向无法提供的独特窗口。本研究表明，CHIME/FRB基带第二星表包含来自最新DECaLS数据发布所识别的星系团内部或后方的FRB；我们分离出一个可能属于此类的26个FRB样本，其中包括1个重复FRB和2个与 coma 星系团相交的FRB。将我们的结果与一系列模拟FRB群体进行比较后，我们得出结论：这些关联的数量代表了星系团方向FRB发生率的3σ增强，占CHIME/FRB基带第二星表中检测到的FRB的1.4±0.4%。我们认为这种增强是由比例相等的、拥有额外FRB的成员星系，以及放大背景源的引力透镜效应共同导致的。我们证明，此类贡献对FRB群体的替代前身星通道和高红移演化很敏感，为未来限制这些特征提供了途径。考虑相关星系团的红移和质量，我们识别出与强引力透镜Abell 2218对齐的FRB 20211113A，作为值得进一步研究的潜在透镜候选体。
英文摘要
Massive galaxy clusters can introduce gravitational lensing and populations of suppressed star formation member galaxies into the line of sight, potentially changing the distribution of observable sources toward them from that of the average sky. As a result, Fast Radio Bursts (FRBs) aligned with galaxy clusters can provide a unique window into parameter spaces of the FRB population that other lines of sight do not afford. In this study, we demonstrate that the second CHIME/FRB baseband catalog contains FRBs emitted from within or behind clusters identified from the latest DECaLS data release; we isolate a sample of 26 FRBs where this is likely, including one repeating FRB and two FRBs that intersect the Coma cluster. Comparing our results against a range of simulated FRB populations, we conclude that the number of these associations represents a $3σ$ rate enhancement toward galaxy clusters, constituting $1.4\pm0.4\%$ of the FRBs detected in the second CHIME/FRB baseband catalog. We suggest that this enhancement is caused by an equal proportion of member galaxies hosting additional FRBs, and gravitational lensing magnifying background sources. We demonstrate that such contributions are sensitive to alternative progenitor channels and high redshift evolution in the FRB population, providing a future avenue for constraining these features. Considering the redshifts and masses of the associated clusters, we identify FRB 20211113A, which is aligned with the strong gravitational lens Abell 2218 as a potential lensed candidate for further consideration.
