Speaker
Description
Fast radio bursts (FRBs) are bright millisecond-duration radio transients from distant galaxies, whose physical origin remains uncertain. Studying relations between burst properties, such as energy and intrinsic duration, may enable the use of FRBs as cosmological probes by providing luminosity distance estimates when combined with spectroscopic redshifts, without relying on the $H_0$--$f_{\rm IGM}$ degeneracy inherent in dispersion measure-based methods. Previous studies reported a possible energy--duration correlation in non-repeating FRBs ($p \approx 10^{-3}$); however, earlier analyses were based on relatively small samples, leading to large statistical uncertainties in the measured relation. In this work, we update the intrinsic energy--duration relation using the recently released CHIME/FRB Second Catalog. After applying selection criteria, we analyze 2304 non-repeating FRBs, providing the largest sample used to study this relation to date. For each burst, we compute the rest-frame intrinsic duration and isotropic burst energy integrated over a 400~MHz bandwidth and investigate their correlation across multiple redshift intervals ($0 < z < 0.3$, $0.3 < z < 0.5$, $0.5 < z < 1.0$, and $1.0 < z < 1.5$). We find a positive correlation between burst energy and intrinsic duration in all redshift bins, with best-fit slopes of $b \sim 0.13$--$0.21$. The positive slopes indicate that more energetic bursts tend to have longer intrinsic durations. The corresponding $p$-values are $2.9 \times 10^{-5}$, $3.9 \times 10^{-6}$, $2.5 \times 10^{-5}$, and $1.6 \times 10^{-2}$, indicating strong statistical significance.The persistence of the $E$--$w$ relation across all redshift bins suggests an intrinsic origin; however, its strong correlation with $\tau_{\rm scat}$ indicates that propagation effects remain a significant contributor to the observed dispersion. The much larger CHIME/FRB Catalog 2 sample significantly improves the statistical robustness compared to earlier studies based on smaller datasets. These results suggest that the energy--duration relation reflects an intrinsic physical property of non-repeating FRB emission and may provide a potential tool for future FRB-based cosmological studies.
| Participate the oral/poster presentation award competition | Yes |
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