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arXiv · 2206.11330

On the relation between duration and energy of non-repeating fast radio bursts: census with the CHIME data

Seong Jin Kim·Tetsuya Hashimoto·Bo Han Chen·Tomotsugu Goto·Simon C. -C. Ho·Tiger Yu-Yang Hsiao·Yi Hang Valerie Wong·Shotaro Yamasaki
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Abstract

A correlation between the intrinsic energy and the burst duration of non-repeating fast radio bursts (FRBs) has been reported. If it exists, the correlation can be used to estimate intrinsic energy from the duration, and thus can provide us with a new distance measure for cosmology. However, the correlation suffered from small number statistics (68 FRBs) and was not free from contamination by latent repeating populations, which might not have such a correlation. How to separate/exclude the repeating bursts from the mixture of all different types of FRBs is essential to see this property. Using a much larger sample from the new FRB catalogue (containing 536 FRBs) recently released by the CHIME/FRB project, combined with a new classification method developed based on unsupervised machine learning, we carried out further scrutiny of the relation. We found that there is a weak correlation between the intrinsic energy and duration for non-repeating FRBs at z < 0.3 with Kendall's tau correlation coefficient of 0.239 and significance of 0.001 (statistically significant), whose slope looks similar to that of gamma-ray bursts. This correlation becomes weaker and insignificant at higher redshifts (z > 0.3), possibly due to the lack of the faint FRBs at high-z and/or the redshift evolution of the correlation. The scattering time in the CHIME/FRB catalogue shows an intriguing trend: it varies along the line obtained from linear fit on the energy versus duration plane between these two parameters. A possible cosmological application of the relation must wait for faint FRBs at high-z.

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Seong Jin Kim, Tetsuya Hashimoto, Bo Han Chen, Tomotsugu Goto, Simon C. -C. Ho, Tiger Yu-Yang Hsiao, Yi Hang Valerie Wong, Shotaro Yamasaki. 2022-06-22. On the relation between duration and energy of non-repeating fast radio bursts: census with the CHIME data. https://doi.org/10.1093/mnras%2Fstac1689

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