On the paucity of fast radio bursts at low Galactic latitudes
We examine the effect of Galactic diffractive interstellar scintillation as a means of explaining the reported deficit of fast radio burst (FRB) detections at low Galactic latitude. We model the unknown underlying FRB flux density distribution as a power law with a rate scaling as S−5/2+δν and accou...
| Main Authors: | , |
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| Format: | Journal Article |
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Oxford University Press
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/32469 |
| _version_ | 1848753672128823296 |
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| author | Macquart, Jean-Pierre Johnston, S. |
| author_facet | Macquart, Jean-Pierre Johnston, S. |
| author_sort | Macquart, Jean-Pierre |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We examine the effect of Galactic diffractive interstellar scintillation as a means of explaining the reported deficit of fast radio burst (FRB) detections at low Galactic latitude. We model the unknown underlying FRB flux density distribution as a power law with a rate scaling as S−5/2+δν and account for the fact that the FRBs are detected at unknown positions within the telescope beam. We find that the event rate of FRBs located off the Galactic plane may be enhanced by a factor of ~30–300 per cent relative to objects near the Galactic plane without necessarily affecting the slope of the distribution. For FRBs whose flux densities are subject to relatively weak diffractive scintillation, as is typical for events detected at high Galactic latitudes, we demonstrate that an effect associated with Eddington bias is responsible for the enhancement. The magnitude of the enhancement increases with the steepness of the underlying flux density distribution, so that existing limits on the disparity in event rates between high and low Galactic latitudes suggest that the FRB population has a steep differential flux density distribution, scaling as S−3.5ν or steeper. Existing estimates of the event rate in the flux density range probed by the High Time Resolution Universe survey overestimate the true rate by a factor of ~3. |
| first_indexed | 2025-11-14T08:28:14Z |
| format | Journal Article |
| id | curtin-20.500.11937-32469 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:28:14Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-324692017-09-13T15:23:30Z On the paucity of fast radio bursts at low Galactic latitudes Macquart, Jean-Pierre Johnston, S. We examine the effect of Galactic diffractive interstellar scintillation as a means of explaining the reported deficit of fast radio burst (FRB) detections at low Galactic latitude. We model the unknown underlying FRB flux density distribution as a power law with a rate scaling as S−5/2+δν and account for the fact that the FRBs are detected at unknown positions within the telescope beam. We find that the event rate of FRBs located off the Galactic plane may be enhanced by a factor of ~30–300 per cent relative to objects near the Galactic plane without necessarily affecting the slope of the distribution. For FRBs whose flux densities are subject to relatively weak diffractive scintillation, as is typical for events detected at high Galactic latitudes, we demonstrate that an effect associated with Eddington bias is responsible for the enhancement. The magnitude of the enhancement increases with the steepness of the underlying flux density distribution, so that existing limits on the disparity in event rates between high and low Galactic latitudes suggest that the FRB population has a steep differential flux density distribution, scaling as S−3.5ν or steeper. Existing estimates of the event rate in the flux density range probed by the High Time Resolution Universe survey overestimate the true rate by a factor of ~3. 2015 Journal Article http://hdl.handle.net/20.500.11937/32469 10.1093/mnras/stv1184 Oxford University Press fulltext |
| spellingShingle | Macquart, Jean-Pierre Johnston, S. On the paucity of fast radio bursts at low Galactic latitudes |
| title | On the paucity of fast radio bursts at low Galactic latitudes |
| title_full | On the paucity of fast radio bursts at low Galactic latitudes |
| title_fullStr | On the paucity of fast radio bursts at low Galactic latitudes |
| title_full_unstemmed | On the paucity of fast radio bursts at low Galactic latitudes |
| title_short | On the paucity of fast radio bursts at low Galactic latitudes |
| title_sort | on the paucity of fast radio bursts at low galactic latitudes |
| url | http://hdl.handle.net/20.500.11937/32469 |