The true fraction of repeating fast radio bursts revealed through CHIME source count evolution

• DOI: 10.48550/arxiv.2309.14337
• Publication Date: 2023-01-01
• Authors: Shotaro Yamasaki; Tomotsugu Goto; Chih-Teng Ling; T. Hashimoto
• Keywords: Repeater (horology); Repetition (rhetorical device); Fraction (chemistry)

Fast Radio Bursts (FRBs) are classified into repeaters and non-repeaters, with only a few percent of the observed FRB population from Canadian Hydrogen Intensity Mapping Experiment (CHIME) confirmed as repeaters. However, this figure represents lower limit due to observational biases, true fraction remains unknown. Correcting for these biases uncovers notable decline in apparently non-repeating detection rate CHIME operational time increases. This finding suggests that significant portion FRBs could fact exhibit repetition when over more extended periods. A simple model infers repeater likely exceeds 50% 99% confidence, substantially larger than face value, even consistent 100%. greater prevalence had previously gone unnoticed their very low rates ($\sim$10$^{-3.5}$ hr$^{-1}$ on average). Hence, theoretical models must incorporate low-rate Furthermore, our results indicate significantly higher volume number density, potentially exceeding values by up 10$^4$ times, which turn impacts comparisons potential progenitors.