Constraints on the Persistent Radio Source Associated with FRB 20190520B Using the European VLBI Network
Journal article, 2023

We present very long baseline interferometry (VLBI) observations of a continuum radio source potentially associated with the fast radio burst source FRB 20190520B. Using the European VLBI network, we find the source to be compact on VLBI scales with an angular size of <2.3 mas (3 sigma). This corresponds to a transverse physical size of <9 pc (at the z = 0.241 redshift of the host galaxy), confirming it to be as fast radio burst (FRB) persistent radio source (PRS) like that associated with the first-known repeater FRB 20121102A. The PRS has a flux density of 201 +/- 34 mu Jy at 1.7 GHz and a spectral radio luminosity of L-1.7 GHz = (3.0 +/- 0.5) x 10(29) erg s(-1) Hz(-1) (also similar to the FRB 20121102A PRS). Compared to previous lower-resolution observations, we find that no flux is resolved out on milliarcsecond scales. We have refined the PRS position, improving its precision by an order of magnitude compared to previous results. We also report the detection of the FRB 20190520B burst at 1.4 GHz and find the burst position to be consistent with the PRS position, at less than or similar to 20 mas. This strongly supports their direct physical association and the hypothesis that a single central engine powers both the bursts and the PRS. We discuss the model of a magnetar in a wind nebula and present an allowed parameter space for its age and the radius of the putative nebula powering the observed PRS emission. Alternatively, we find that an accretion-powered hypernebula model also fits our observational constraints.

Author

Shivani Bhandari

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

University of Amsterdam

Joint Institute for VLBI in Europe (JIVE)

Netherlands Institute for Radio Astronomy (ASTRON)

Benito Marcote

Joint Institute for VLBI in Europe (JIVE)

Navin Sridhar

Columbia University

California Institute of Technology (Caltech)

Columbia Univ, Theoret High Energy Astrophys THEA Grp

Tarraneh Eftekhari

Northwestern University

Jason W. T. Hessels

Netherlands Institute for Radio Astronomy (ASTRON)

University of Amsterdam

Dante M. Hewitt

University of Amsterdam

Franz Kirsten

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Omar S. Ould-Boukattine

University of Amsterdam

Netherlands Institute for Radio Astronomy (ASTRON)

Zsolt Paragi

Joint Institute for VLBI in Europe (JIVE)

Mark P. Snelders

University of Amsterdam

Netherlands Institute for Radio Astronomy (ASTRON)

Astrophysical Journal Letters

2041-8205 (ISSN) 2041-8213 (eISSN)

Vol. 958 2 L19

Onsala space observatory infrastructure

Swedish Research Council (VR) (2017-00648), 2018-01-01 -- 2021-12-31.

Opticon RadioNet Pilot

European Commission (EC) (EC/H2020/101004719), 2021-03-01 -- 2025-02-28.

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.3847/2041-8213/ad083f

More information

Latest update

9/16/2024