A Nearby Repeating Fast Radio Burst in the Direction of M81,The Astrophysical Journal Letters

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A Nearby Repeating Fast Radio Burst in the Direction of M81
The Astrophysical Journal Letters ( IF 7.9 ) Pub Date : 2021-04-01 , DOI: 10.3847/2041-8213/abeaa6
M. Bhardwaj _{1,

2} , B. M. Gaensler _{3,

4} , V. M. Kaspi _{1,

2} , T. L. Landecker ₅ , R. Mckinven _{3,

4} , D. Michilli _{1,

2} , Z. Pleunis _{1,

2} , S. P. Tendulkar _{6,

7} , B. C. Andersen _{1,

2} , P. J. Boyle _{1,

2} , T. Cassanelli _{3,

4} , P. Chawla _{1,

2} , A. Cook _{3,

4} , M. Dobbs _{1,

2} , E. Fonseca _{1,

2,

8,

9} , J. Kaczmarek ₅ , C. Leung _{10,

11} , K. Masui _{10,

11} , M. Mnchmeyer ₁₂ , C. Ng ₃ , M. Rafiei-Ravandi _{12,

13} , P. Scholz ₃ , K. Shin _{10,

11} , K. M. Smith ₁₂ , I. H. Stairs ₁₄ , A. V. Zwaniga _{1,

2}

Affiliation

Department of Physics, McGill University, 3600 rue University, Montral, QC H3A 2T8, Canada
McGill Space Institute, McGill University, 3550 rue University, Montral, QC H3A 2A7, Canada
Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
David A. Dunlap Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
Dominion Radio Astrophysical Observatory, Herzberg Astronomy & Astrophysics Research Centre, National Research Council Canada, P.O. Box 248, Penticton, BC V2A 6J9, Canada
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai, 400005, India
National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune, 411007, India
Department of Physics and Astronomy, West Virginia University, P.O. Box 6315, Morgantown, WV 26506, USA
Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, USA
MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Perimeter Institute for Theoretical Physics, 31 Caroline Street N, Waterloo, ON N2L 2Y5, Canada
Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Department of Physics and Astronomy, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 Canada

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 arcmin² (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.

中文翻译：

一个在 M81 方向附近重复的快速射电暴

我们报告了 FRB 20200120E 的发现，这是加拿大氢强度测绘实验 FRB 项目检测到的具有低色散测量 (DM) 的重复快速射电暴 (FRB)。87.82 pc cm ^-3的源 DM是迄今为止从 FRB 记录的最低值，但它明显高于银河系星际介质在这个方向上的预期最大值（~50 pc cm ^-3）。在 2020 年 1 月至 11 月期间，我们从源中检测到了三个爆发和一个候选爆发。2020 年 1 月 20 日事件的基带电压数据使源的天空定位在≃14 arcmin ²以内（90% 的置信度）。FRB 定位接近 M81，一个距离 3.6 Mpc 的旋涡星系。上M81郊区的FRB出现（投影偏移约20 KPC）但以及其延伸ħ内部我和厚的圆盘。我们凭经验估计与 M81 巧合的概率 <10 ^-2. 然而，我们不能拒绝 FRB 的银河系晕起源。在 FRB 定位区域内，我们发现了几个有趣的编目 M81 源和一个在甚大阵列巡天中检测到的射电点源。我们在 Swift Burst Alert Telescope 和 Fermi/GBM 数据中寻找及时的 X 射线对应物，并且对于两个 FRB 20200120E 爆发，我们排除了重合的 SGR 1806−20 类 X 射线爆发。由于 FRB 20200120E 的临近，未来对快速多波长对应物和亚弧秒定位的后续跟踪可能会限制拟议的 FRB 模型。

更新日期：2021-04-01

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