Discovery of a PRS associated with FRB 20240114A

Abstract

We present the discovery of the fourth persistent radio source (PRS) associated with a fast radio burst (FRB). Following previous indications of a candidate PRS associated with FRB20240114A, we performed deep VLBA observations at 5 GHz to test the presence of a compact radio source within the uncertainty position of this FRB ($\pm$200 mas). We detect a component $\sim$50 mas northwards the nominal position provided by the PRECISE collaboration. The corresponding radio luminosity, together with the Faraday rotation measure provided by previous observations of the FRB, locate this PRS in the expected region of the $L$ vs |RM| relation for the nebular model, further supporting it. The comparison of the measured flux density with the values collected at lower frequency by previous studies indicates a possible steepening of the radio spectrum in the 1-5 GHz range. Optical observations performed with the LBT could reveal that the FRB and its PRS lie at $\sim$1 kpc from the centre of the host galaxy, which is a dwarf sub-solar metallicity starburst galaxy with SFR $\sim 1M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$ and stellar mass $M\sim 10^8{M}_{\odot }$.

Accepted for publication in A&A Letters

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• Repeating versus Nonrepeating Fast Radio Bursts: A Deep Learning Approach to Morphological Characterization
• FRB cosmology with the RM-PRS Luminosity Correlation
• A broadband study of FRB20240114A with the Effelsberg 100-m radio telescope
• Deep Synoptic Array Science: Searching for Long Duration Radio Transients with the DSA-110
• Estimation of neutron star mass and radius of FRB 20240114A by identification of crustal oscillations
• VLBI Observations of SN 2012au Reveal a Compact Radio Source a Decade Post Explosion
• Milliarcsecond-scale spectrum of the persistent radio source associated with FRB 20190417A and constraints for FRB 20181030A
• Indication for Decreasing Dispersion Measure in the Population of Repeating Fast Radio Bursts and Connection to Young Supernova Remnant Expansion
• Flux Variations of Fast Radio Bursts and Their Persistent Radio Sources: Evidence for a Shared Progenitor
• Unveiling the spectral morphological division of fast radio bursts with CHIME/FRB Catalog 2