Low-frequency Probes of the Persistent Radio Sources Associated with Repeating Fast Radio Bursts
Year: 2025
Type: article
Abstract: The discovery of persistent radio sources (PRSs) associated with three repeating fast radio bursts (FRBs) has provided insight into the local environments of these FRBs. Here, we present deep radio observations of the fields surrounding three highly active repeating FRBs, namely, FRB 20220912A, FRB 20240114A, and FRB 20240619D, using the upgraded Giant Metrewave Radio Telescope at low radio frequencies. Toward FRB 20240114A, we report the detection of compact source at 650 MHz with a flux density of 65.6 ± 8.1 μ Jy beam −1 . Our measurements of the spectral index, star formation rate of the host galaxy, and recently reported constraints on the physical size strongly argue for our detected source to be a PRS associated with the FRB 20240114A. We investigate possible origins of the PRS associated with FRB 20240114A. Based on its brightness and age, we rule out central engines formed via accretion-induced collapse of a white dwarf, while superluminous supernovae, long gamma-ray bursts, and neutron star merger channels remain viable. An off-axis GRB afterglow could also explain the observed emission. For FRB 20220912A, we detect radio emission that is most likely due to star formation in the host galaxy. For FRB 20240619D, we provide upper limits on the radio emission from an associated PRS or the host galaxy. The detection of the PRS associated with FRB 20240114A is a useful addition to the PRSs known to be associated with only three other FRBs so far, and further supports the origin of the PRS in the form of magnetoionic medium surrounding the FRB sources.
Source: The Astrophysical Journal
Authors: Yash Bhusare, Yogesh Maan, Ajay Kumar
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, Yale University, Carnegie Institution of Washington, Ohio State University, California Institute of Technology, Harvard University, Johns Hopkins University, New Mexico State University, Space Telescope Science Institute, Flatiron Health, Tata Institute of Fundamental Research, École Polytechnique Fédérale de Lausanne, University of Toronto, Universidad Nacional Autónoma de México, Yunnan University, Nanjing University, China National Textile and Apparel Council, Leibniz-Institut für Astrophysik Potsdam, Max-Planck-Institut für Astronomie, University of Illinois at Urbana-Champaign, Jet Propulsion Laboratory, University of California, Los Angeles, University of Colorado Boulder, Smithsonian Astrophysical Observatory, Leibniz-Gemeinschaft, Science and Engineering Research Board, National Astronomical Observatories, Chinese Academy of Sciences
Award: G2202386277
OpenAlex ID: W4415946875