期刊
ASTROPHYSICAL JOURNAL
卷 923, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac33ac
关键词
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资金
- Canada Foundation for Innovation (CFI) 2012 Leading Edge Fund [31170]
- CFI 2015 Innovation Fund [33213]
- Dunlap Institute for Astronomy and Astrophysics at the University of Toronto
- Canadian Institute for Advanced Research (CIFAR)
- McGill University
- McGill Space Institute via the Trottier Family Foundation
- University of British Columbia
- University of Toronto
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research Innovation
- NSERC
- Canadian Institute for Advanced Research
- CFI John R. Evans Leaders Fund
- John I. Watters research fellowship
- Lorne Trottier Chair in Astrophysics & Cosmology, a Distinguished James McGill Professorship
- NSERC [RGPIN 228738-13]
- Gerhard Herzberg award
- CIFAR
- FRQNT CRAQ
- NSF [2008031, 2006548]
- FRQNT Doctoral Research awards
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2015-05948]
- Canada Research Chairs program
- U.S. Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- NSF Graduate Research Fellowship Program
- David Dunlap family
- province of British Columbia
- province of Quebec
- province of Ontario
- Direct For Mathematical & Physical Scien [2006548] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [2006548] Funding Source: National Science Foundation
This study presents a synthesis of fast radio burst (FRB) morphology detected in the 400-800 MHz frequency range by the CHIME/FRB project, identifying four observed archetypes of burst morphology and discussing the implications of these differences for using FRBs as astrophysical tools. The researchers confirm that bursts from repeating sources have larger widths on average and are narrower in bandwidth, potentially due to beaming or propagation effects.
We present a synthesis of fast radio burst (FRB) morphology (the change in flux as a function of time and frequency) as detected in the 400-800 MHz octave by the FRB project on the Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB), using events from the first CHIME/FRB catalog. The catalog consists of 62 bursts from 18 repeating sources, plus 474 one-off FRBs, detected between 2018 July 25 and 2019 July 2. We identify four observed archetypes of burst morphology (simple broadband, simple narrowband, temporally complex, and downward drifting) and describe relevant instrumental biases that are essential for interpreting the observed morphologies. Using the catalog properties of the FRBs, we confirm that bursts from repeating sources, on average, have larger widths, and we show, for the first time, that bursts from repeating sources, on average, are narrower in bandwidth. This difference could be due to beaming or propagation effects, or it could be intrinsic to the populations. We discuss potential implications of these morphological differences for using FRBs as astrophysical tools.
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