Continued radio observations of the persistent radio source associated with FRB20190520B provides insights into its origin

Abstract

Follow-up studies of persistent emission from fast radio burst (FRB) sources are critical for understanding their elusive emission mechanisms and the nature of their progenitors. This work presents new observations of the persistent radio source (PRS) associated with FRB 20190520B. We observe a gradual decay in the PRS brightness, which is punctuated by periods of brightening and dimming at both 1.5 and 3 GHz. Furthermore, our low-frequency ($<1$ GHz) observations--the first for this source--reveal evidence of a spectral break, which can be attributed to absorption processes. Interpreted within the framework of the magnetar wind nebula model, our data constrain the age of the magnetar progenitor to $52_{-10}^{+16}$ yr, broadly consistent with previous work. Assuming the observed 1.5 GHz variability is driven by scintillation, we discuss the constraints on the size of the persistent source. The observations presented here challenge the predictions of the previously published best-fit hypernebula model for this source.

11 pages, 5 figures, 3 tables; accepted for publication in ApJ

References in corpus (14)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• A bright millisecond radio burst of extragalactic origin
• CASA, the Common Astronomy Software Applications for Radio Astronomy
• The direct localization of a fast radio burst and its host
• The First CHIME/FRB Fast Radio Burst Catalog
• A repeating fast radio burst source localised to a nearby spiral galaxy
• A repeating fast radio burst associated with a persistent radio source
• Magnetic field reversal in the turbulent environment around a repeating fast radio burst
• The 60 pc Environment of FRB 20180916B
• Blinkverse: A Database of Fast Radio Bursts
• The FRB20190520B Sightline Intersects Foreground Galaxy Clusters
• A Radio Study of Persistent Radio Sources in Nearby Dwarf Galaxies: Implications for Fast Radio Bursts
• A Hyperactive FRB Pinpointed in an SMC-Like Satellite Host Galaxy

Cited by in corpus (3)

• VLBI Observations of SN 2012au Reveal a Compact Radio Source a Decade Post Explosion
• Flux Variations of Fast Radio Bursts and Their Persistent Radio Sources: Evidence for a Shared Progenitor
• Low-frequency-selected Fast Radio Burst Host Galaxy Candidates