A link between repeating and non-repeating fast radio bursts through their energy distributions

A link between repeating and non-repeating fast radio bursts through their energy distributions

4 January 2024 | F. Kirsten, O. S. Ould-Boukattine, W. Herrmann, M. P. Gawroński, J. W. T. Hessels, W. Lu, M. P. Snelders, P. Chawla, J. Yang, R. Blaauw, K. Nimmo, W. Puchalska, P. Wolak, R. van Ruiten
This study investigates the energy distributions of fast radio bursts (FRBs) to explore whether repeating and non-repeating FRBs share a common physical origin. The authors observed the hyperactive repeating FRB source, FRB 20201124A, using four 25–32 m class radio telescopes for over 2,000 hours. They detected 46 high-energy bursts, many more than expected from previous observations of lower-energy bursts with larger telescopes. The high-energy burst distribution resembles that of the non-repeating FRB population, suggesting that non-repeating FRBs may be the rarest bursts from repeating sources. The study also discusses how FRB 20201124A contributes to the all-sky FRB rate and how similar sources could be observable at very high redshifts. The findings indicate that the high-energy bursts from FRB 20201124A span at least six orders of magnitude in spectral energy density, with a distribution that flattens towards the highest energies, resembling that of non-repeating FRBs. This suggests that the emission mechanisms or regions of high-energy bursts may differ from those of lower-energy bursts. Additionally, the study shows that FRB 20201124A's extremely energetic bursts contribute significantly to the all-sky FRB rate, highlighting the importance of hyperactive repeating sources in the observed FRB population.This study investigates the energy distributions of fast radio bursts (FRBs) to explore whether repeating and non-repeating FRBs share a common physical origin. The authors observed the hyperactive repeating FRB source, FRB 20201124A, using four 25–32 m class radio telescopes for over 2,000 hours. They detected 46 high-energy bursts, many more than expected from previous observations of lower-energy bursts with larger telescopes. The high-energy burst distribution resembles that of the non-repeating FRB population, suggesting that non-repeating FRBs may be the rarest bursts from repeating sources. The study also discusses how FRB 20201124A contributes to the all-sky FRB rate and how similar sources could be observable at very high redshifts. The findings indicate that the high-energy bursts from FRB 20201124A span at least six orders of magnitude in spectral energy density, with a distribution that flattens towards the highest energies, resembling that of non-repeating FRBs. This suggests that the emission mechanisms or regions of high-energy bursts may differ from those of lower-energy bursts. Additionally, the study shows that FRB 20201124A's extremely energetic bursts contribute significantly to the all-sky FRB rate, highlighting the importance of hyperactive repeating sources in the observed FRB population.
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