FRB 20210405I: a nearby Fast Radio Burst localized to sub-arcsecond precision with MeerKAT

Author:

Driessen L N123ORCID,Barr E D4,Buckley D A H567ORCID,Caleb M38ORCID,Chen H69ORCID,Chen W4,Gromadzki M10ORCID,Jankowski F211ORCID,Kraan-Korteweg R C6,Palmerio J12,Rajwade K M13ORCID,Tremou E14ORCID,Kramer M215,Stappers B W2ORCID,Vergani S D12,Woudt P A6ORCID,Bezuidenhout M C215ORCID,Malenta M2,Morello V216ORCID,Sanidas S2,Surnis M P17,Fender R P186

Affiliation:

1. CSIRO, Space and Astronomy , PO Box 1130, Bentley, WA 6102 , Australia

2. Department of Physics and Astronomy, Jodrell Bank Centre for Astrophysics, The University of Manchester , Manchester, M13 9PL , UK

3. Sydney Institute for Astronomy, School of Physics, The University of Sydney , NSW 2006 , Australia

4. Max-Planck-Institut für Radioastronomie , Auf dem Hügel 79, D-53121 Bonn , Germany

5. South African Astronomical Observatory , PO Box 9, Observatory Rd, Observatory 7935 , South Africa

6. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701 , South Africa

7. Department of Physics, University of the Free State , PO Box 339, Bloemfontein 9300 , South Africa

8. ASTRO3D: ARC Centre of Excellence for All-sky Astrophysics in 3D , ACT 2601 , Australia

9. Research Center for Intelligent Computing Platforms, Zhejiang Laboratory , Hangzhou 311100 , China

10. Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, PL-00-478 Warszawa , Poland

11. LPC2E, Université d’Orléans, CNRS , 3A Avenue de la Recherche Scientifique, F-45071 Orléans , France

12. GEPI, Observatoire de Paris, Université PSL, CNRS , 5 PlaceJules Janssen, F-92190 Meudon , France

13. ASTRON, the Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo , the Netherlands

14. National Radio Astronomy Observatory , Socorro, NM 87801 , USA

15. Centre for Space Research, North-West University , Potchefstroom 2531 , South Africa

16. SKA Observatory, Jodrell Bank , Lower Withington, Macclesfield, Cheshire, SK11 9FT , UK

17. Department of Physics, Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road, Bhauri Bhopal 462066, Madhya Pradesh , India

18. Department of Physics, Astrophysics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH , UK

Abstract

ABSTRACT We present the first sub-arcsecond localized Fast Radio Burst (FRB) detected using MeerKAT. FRB 20210405I was detected in the incoherent beam using the MeerTRAP pipeline on 2021 April 05 with a signal to noise ratio of 140.8 and a dispersion measure of 565.17 pc cm−3. It was detected while MeerTRAP was observing commensally with the ThunderKAT large survey project, and was sufficiently bright that we could use the ThunderKAT 8 s images to localize the FRB. Two different models of the dispersion measure in the Milky Way and halo suggest that the source is either right at the edge of the Galaxy, or outside. This highlights the uncertainty in the Milky Way dispersion measure models, particularly in the Galactic Plane, and the uncertainty of Milky Way halo models. Further investigation and modelling of these uncertainties will be facilitated by future detections and localizations of nearby FRBs. We use the combined localization, dispersion measure, scattering, specific luminosity, and chance coincidence probability information to find that the origin is most likely extra-galactic and identify the likely host galaxy of the FRB: 2MASS J1701249−4932475. Using SALT spectroscopy and archival observations of the field, we find that the host is a disc/spiral galaxy at a redshift of z = 0.066.

Funder

European Research Council

Australian Research Council

National Research Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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