High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients Survey
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866908579454255104 |
|---|---|
| author | Scott, D. R. Dial, T. Bera, A. Deller, A. T. Glowacki, M. Gourdji, K. James, C. W. Shannon, R. M. Bannister, K. W. Ekers, R. D. Paterson, J. Sammons, M. Sutinjo, A. T. Uttarkar, P. A. |
| author_facet | Scott, D. R. Dial, T. Bera, A. Deller, A. T. Glowacki, M. Gourdji, K. James, C. W. Shannon, R. M. Bannister, K. W. Ekers, R. D. Paterson, J. Sammons, M. Sutinjo, A. T. Uttarkar, P. A. |
| contents | We present microsecond-resolution, coherently-dedispersed, polarimetric measurements of 35 fast radio bursts (FRBs) detected during the Commensal Real-time ASKAP Fast Transients (CRAFT) incoherent sum (ICS) survey with the Australian Square Kilometre Array Pathfinder (ASKAP). We find a wide diversity of time-frequency morphology and polarisation properties broadly consistent with those of currently known non-repeating FRBs. The high S/N and fine time-resolution of our data however reveals a wealth of new information. Key results include (i) the distribution of scattering timescales, $τ_{obs}$, is limited purely by instrumental effects, with no downturn at high $τ_{obs}$ as expected from a log-normal distribution; (ii) for the 29 FRBs with known redshift, there is no detectable correlation between $τ_{obs}$ and dispersion measure (DM) fluctuations about the Macquart relation, in contrast to expectations from pulsar scattering-DM relations; (iii) all FRBs probably have multiple components, and at least a large fraction have variable PA, the identification of which is limited by scattering; (iv) at least half of all FRBs exhibit PA microstructure at 200 $μs$-200 ns timescales, with behaviour most closely resembling a sub-category of Crab main pulses; (v) that there is a break in the FRB circular polarisation distribution at Stokes V $\gtrsim$ 20%, which is suggestive of a discrete sub-population. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_17497 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients Survey Scott, D. R. Dial, T. Bera, A. Deller, A. T. Glowacki, M. Gourdji, K. James, C. W. Shannon, R. M. Bannister, K. W. Ekers, R. D. Paterson, J. Sammons, M. Sutinjo, A. T. Uttarkar, P. A. High Energy Astrophysical Phenomena We present microsecond-resolution, coherently-dedispersed, polarimetric measurements of 35 fast radio bursts (FRBs) detected during the Commensal Real-time ASKAP Fast Transients (CRAFT) incoherent sum (ICS) survey with the Australian Square Kilometre Array Pathfinder (ASKAP). We find a wide diversity of time-frequency morphology and polarisation properties broadly consistent with those of currently known non-repeating FRBs. The high S/N and fine time-resolution of our data however reveals a wealth of new information. Key results include (i) the distribution of scattering timescales, $τ_{obs}$, is limited purely by instrumental effects, with no downturn at high $τ_{obs}$ as expected from a log-normal distribution; (ii) for the 29 FRBs with known redshift, there is no detectable correlation between $τ_{obs}$ and dispersion measure (DM) fluctuations about the Macquart relation, in contrast to expectations from pulsar scattering-DM relations; (iii) all FRBs probably have multiple components, and at least a large fraction have variable PA, the identification of which is limited by scattering; (iv) at least half of all FRBs exhibit PA microstructure at 200 $μs$-200 ns timescales, with behaviour most closely resembling a sub-category of Crab main pulses; (v) that there is a break in the FRB circular polarisation distribution at Stokes V $\gtrsim$ 20%, which is suggestive of a discrete sub-population. |
| title | High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients Survey |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2505.17497 |