A nearby repeating fast radio burst in the direction of M81

M Bhardwaj, BM Gaensler, VM Kaspi… - The Astrophysical …, 2021 - iopscience.iop.org
M Bhardwaj, BM Gaensler, VM Kaspi, TL Landecker, R Mckinven, D Michilli, Z Pleunis…
The Astrophysical Journal Letters, 2021iopscience.iop.org
We report on the discovery of FRB 20200120E, a repeating fast radio burst (FRB) with a low
dispersion measure (DM) detected by the Canadian Hydrogen Intensity Mapping
Experiment FRB project. The source DM of 87.82 pc cm− 3 is the lowest recorded from an
FRB to date, yet it is significantly higher than the maximum expected from the Milky Way
interstellar medium in this direction (∼ 50 pc cm− 3). We have detected three bursts and one
candidate burst from the source over the period 2020 January–November. The baseband …
Abstract
We report on the discovery of FRB 20200120E, a repeating fast radio burst (FRB) with a low dispersion measure (DM) detected by the Canadian Hydrogen Intensity Mapping Experiment FRB project. The source DM of 87.82 pc cm− 3 is the lowest recorded from an FRB to date, yet it is significantly higher than the maximum expected from the Milky Way interstellar medium in this direction (∼ 50 pc cm− 3). We have detected three bursts and one candidate burst from the source over the period 2020 January–November. The baseband voltage data for the event on 2020 January 20 enabled a sky localization of the source to within≃ 14 arcmin 2 (90% confidence). The FRB localization is close to M81, a spiral galaxy at a distance of 3.6 Mpc. The FRB appears on the outskirts of M81 (projected offset∼ 20 kpc) but well inside its extended H i and thick disks. We empirically estimate the probability of a chance coincidence with M81 to be< 10− 2. However, we cannot reject a Milky Way halo origin for the FRB. Within the FRB localization region, we find several interesting cataloged M81 sources and a radio point source detected in the Very Large Array Sky Survey. We search for prompt X-ray counterparts in Swift Burst Alert Telescope and Fermi/GBM data, and, for two of the FRB 20200120E bursts, we rule out coincident SGR 1806− 20-like X-ray bursts. Due to the proximity of FRB 20200120E, future follow-up for prompt multiwavelength counterparts and subarcsecond localization could be constraining of proposed FRB models.
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