Beaming as an explanation of the repetition/width relation in FRBs
| Autor: | M. C. Miller, D. W. Gardenier, Liam Connor |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Repetition (rhetorical device) Astrophysics::High Energy Astrophysical Phenomena Solid angle FOS: Physical sciences Astronomy and Astrophysics Observer (special relativity) Astrophysics 01 natural sciences Cosmology Lorentz factor symbols.namesake Pulsar Space and Planetary Science 0103 physical sciences symbols Astrophysics - High Energy Astrophysical Phenomena 010306 general physics Relativistic quantum chemistry 010303 astronomy & astrophysics Event (particle physics) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 497:3076-3082 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | It is currently not known if repeating fast radio bursts (FRBs) are fundamentally different from those that have not been seen to repeat. One striking difference between repeaters and apparent non-repeaters in the Canadian Hydrogen Intensity Mapping Experiment sample is that the once-off events are typically shorter in duration than sources that have been detected two or more times. We offer a simple explanation for this discrepancy based on a selection effect due to beamed emission, in which highly beamed FRBs are less easily observed to repeat, but are abundant enough to detect often as once-off events. The explanation predicts that there is a continuous distribution of burst duration – not a static bimodal one – with a correlation between repetition rate and width. Pulse width and opening angle may be related by relativistic effects in shocks, where short-duration bursts have small solid angles due to a large common Lorentz factor. Alternatively, the relationship could be a geometric effect where narrow beams sweep past the observer more quickly, as with pulsars. Our model has implications for the FRB emission mechanism and energy scale, volumetric event rates, and the application of FRBs to cosmology. |
| Databáze: | OpenAIRE |
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