No Evidence for Galactic Latitude Dependence of the Fast Radio Burst Sky Distribution

Author:

Josephy A.ORCID,Chawla P.ORCID,Curtin A. P.ORCID,Kaspi V. M.ORCID,Bhardwaj M.ORCID,Boyle P. J.ORCID,Brar C.ORCID,Cassanelli T.ORCID,Fonseca E.ORCID,Gaensler B. M.ORCID,Leung C.ORCID,Lin H.-H.ORCID,Masui K. W.ORCID,Mckinven R.ORCID,Mena-Parra J.ORCID,Michilli D.ORCID,Ng C.ORCID,Pleunis Z.ORCID,Rafiei-Ravandi M.ORCID,Rahman M.ORCID,Sanghavi P.ORCID,Scholz P.ORCID,Shin K.ORCID,Smith K. M.ORCID,Stairs I. H.ORCID,Tendulkar S. P.ORCID,Zwaniga A. V.ORCID

Abstract

Abstract We investigate whether the sky rate of fast radio bursts (FRBs) depends on Galactic latitude using the first catalog of FRBs detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project. We first select CHIME/FRB events above a specified sensitivity threshold in consideration of the radiometer equation, and then we compare these detections with the expected cumulative time-weighted exposure using Anderson–Darling and Kolmogorov–Smirnov tests. These tests are consistent with the null hypothesis that FRBs are distributed without Galactic latitude dependence (p-values distributed from 0.05 to 0.99, depending on completeness threshold). Additionally, we compare rates in intermediate latitudes (∣b∣ < 15°) with high latitudes using a Bayesian framework, treating the question as a biased coin-flipping experiment–again for a range of completeness thresholds. In these tests the isotropic model is significantly favored (Bayes factors ranging from 3.3 to 14.2). Our results are consistent with FRBs originating from an isotropic population of extragalactic sources.

Funder

Canada Foundation for Innovation

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 24 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Host Galaxies for Four Nearby CHIME/FRB Sources and the Local Universe FRB Host Galaxy Population;The Astrophysical Journal Letters;2024-08-01

2. Updating the First CHIME/FRB Catalog of Fast Radio Bursts with Baseband Data;The Astrophysical Journal;2024-07-01

3. A Comprehensive Analysis of Repeating Fast Radio Bursts;The Astrophysical Journal Supplement Series;2023-10-27

4. Flux density monitoring of 89 millisecond pulsars with MeerKAT;Monthly Notices of the Royal Astronomical Society;2023-09-18

5. The FAST Galactic Plane Pulsar Snapshot survey – IV. Discovery of five fast radio bursts;Monthly Notices of the Royal Astronomical Society;2023-09-12

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