期刊
ASTROPHYSICAL JOURNAL
卷 927, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac4bc7
关键词
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资金
- National Research Council of Canada - Canada Foundation for Innovation (CFI) 2012 Leading Edge Fund [31170]
- CFI [33213]
- Dunlap Institute for Astronomy and Astrophysics at the University of Toronto
- Canadian Institute for Advanced Research (CIFAR)
- McGill University
- Trottier Family Foundation
- University of British Columbia
- NSF [2006548, 2018490]
- NSERC Discovery Grant
- Canadian Institute for Advanced Research
- FRB research at WVU
- Trottier Family Foundation - CFI [33213]
- University of Toronto
- Fonds de Recherche du Quebec-Nature et Technologies (FRQNT)
- Canada Research Chairs (CRC) program
- U.S. Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- NWO Veni Fellowship
- NSF Graduate Research Fellowship Program
- FRQNT Doctoral Research Award
- Lorne Trottier Chair in Astrophysics Cosmology
- Distinguished James McGill Professorship
- Herzberg Award, from an R. Howard Webster Foundation Fellowship from the Canadian Institute for Advanced Research (CIFAR)
- FRQNT Centre de Recherche en Astrophysique du Quebec
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [2006548] Funding Source: National Science Foundation
This paper reports on the bursts detected by CHIME/FRB from the repeating FRB 20201124A, including their morphologies, fluences, and arrival times. The observations show a significant change in the event rate before and after discovery. Through maximum-likelihood estimation, we find a best-fit index for a power-law luminosity function that is consistent with other repeating FRBs.
The repeating FRB 20201124A was first discovered by CHIME/FRB in November of 2020, after which it was seen to repeat a few times over several months. It entered a period of high activity in April of 2021, at which time several observatories recorded tens to hundreds more bursts from the source. These follow-up observations enabled precise localization and host-galaxy identification. In this paper, we report on the CHIME/FRB-detected bursts from FRB 20201124A, including their best-fit morphologies, fluences, and arrival times. The large exposure time of the CHIME/FRB telescope toward the location of this source allows us to constrain its rates of activity. We analyze the repetition rates over different spans of time, constraining the rate prior to discovery to <3.4 day(-1) (at 3 sigma), and demonstrate a significant change in the event rate following initial detection. Lastly, we perform a maximum-likelihood estimation of a power-law luminosity function, finding a best-fit index alpha = -4.6 +/- 1.3 +/- 0.6, with a break at a fluence threshold of F-min similar to 16.6 Jy ms, consistent with the fluence completeness limit of the observations. This index is consistent within uncertainties with those of other repeating FRBs for which it has been determined.
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