Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Adaeze L. Ibik, Maria R. Drout, Bryan M. Gaensler, Paul Scholz, Navin Sridhar
| Summary:
The identification of persistent radio sources (PRSs) coincident with two
repeating fast radio bursts (FRBs) supports FRB theories requiring a compact
central engine. However, deep non-detections in other cases highlight the
diversity of repeating FRBs and their local environments. Here, we perform a
systematic search for radio sources towards 37 CHIME/FRB repeaters using their
arcminute localizations and a combination of archival surveys and targeted
observations. Through multi-wavelength analysis of individual radio sources, we
identify two (20181030A-S1 and 20190417A-S1) for which we disfavor an origin of
either star formation or an active galactic nucleus in their host galaxies and
thus consider them candidate PRSs. We do not find any associated PRSs for the
majority of the repeating FRBs in our sample. For 8 FRB fields with Very Large
Array imaging, we provide deep limits on the presence of PRSs that are 2–4
orders of magnitude fainter than the PRS associated with FRB,20121102A. Using
Very Large Array Sky Survey imaging of all 37 fields, we constrain the rate of
luminous ($gtrsim$10$^{40}$ erg s$^{-1}$) PRSs associated with repeating FRBs
to be low. Within the context of FRB-PRS models, we find that 20181030A-S1 and
20190417A-S1 can be reasonably explained within the context of magnetar,
hypernebulae, gamma-ray burst afterglow, or supernova ejecta models — although
we note that both sources follow the radio luminosity versus rotation measure
relationship predicted in the nebula model framework. Future observations will
be required to both further characterize and confirm the association of these
PRS candidates with the FRBs.
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