已知快速射电暴源中重复暴是否普遍存在？
Are Repeaters Prevalent Among the Known Fast Radio Burst Sources?
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中文总结 AI 辅助
本研究利用CHIME/FRB第二星表对比非重复暴与重复暴样本，发现两者能量分布斜率、事件率演化存在显著差异，表明部分一次性FRB本质非重复，重复源或为不同且较少见的群体。
中文摘要 AI 辅助
快速射电暴（FRB）是起源未知的毫秒级射电脉冲。尽管开展了大量后续观测，仅约3%的FRB被证实为重复暴。其余FRB是真正的一次性暴，还是因监测时间有限仅被探测到一次的重复源，目前仍不清楚。本研究利用CHIME/FRB第二星表，通过将非重复暴与两类重复包子样本（重复暴的首次探测暴及其最高流量暴）进行对比，检验这一争议。采用考虑选择效应的非参数方法推导这些样本的能量函数和事件率。所有样本均可用断裂幂律能量分布很好地描述，且具有相当的断裂能量（约5×10^38 erg），但重复暴与非重复暴总体的幂律斜率存在显著差异。它们的事件率演化也显著不同。假设ρ(z)∝(1+z)^B，非重复暴的B值为-5.57±0.15，两类重复暴样本的B值分别为-8.63±0.46和-9.10±0.55。大小匹配重采样显示，重复暴的事件率指数远超出非重复包子样本预期的5σ范围，排除了样本量导致观测差异的可能。这些结果表明，至少有一部分一次性FRB本质上是非重复的，意味着重复源可能是一个不同且可能不那么常见的群体。
英文摘要
Fast radio bursts (FRBs) are millisecond radio pulses of unknown origin. Despite extensive follow-up observations, only $\sim3\%$ of FRBs have been confirmed as repeaters. It remains unclear whether the rest are truly one-off bursts, or essentially repeating sources that have only been detected once due to limited monitoring time. Using the second CHIME/FRB catalog, we test this debate by comparing non-repeaters with two repeater-based subsamples: the first-detected bursts of repeaters and their highest-fluence bursts. A non-parametric method that accounts for selection effects is employed to derive the energy functions and event rates of these samples. All samples are well described by broken power-law energy distributions with comparable break energies ($\sim 5\times10^{38}$ erg), but with significantly different slopes between repeating and non-repeating populations. Their event-rate evolution also differs significantly. Assuming $ρ(z) \propto (1+z)^B$, we have $B = -5.57^{+0.15}_{-0.15}$ for non-repeaters and $B = -8.63^{+0.46}_{-0.41}$ and $-9.10^{+0.55}_{-0.56}$ for the two repeater samples. Size-matched resampling shows that the repeater event-rate indices lie far outside the 5$σ$ range expected from non-repeater subsamples, ruling out sample size as the reason for the observed difference. These results indicate that at least a subset of one-off FRBs are intrinsically non-repeating, implying that repeating sources may represent a distinct and possibly less common population.
发表机构
- Nanjing University（南京大学）
- Qufu Normal University（曲阜师范大学）
- Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education（教育部现代天文与天体物理重点实验室（南京大学））
- Anqing Normal University（安庆师范大学）
- Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）
- University of Science and Technology of China（中国科学技术大学）
- State Key Laboratory of Radio Astronomy and Technology, Xinjiang Astronomical Observatory, CAS（中国科学院新疆天文台射电天文与技术国家重点实验室）
- Xinjiang Key Laboratory of Radi（新疆辐射重点实验室）
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