Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Adaeze L. Ibik, Maria R. Drout, B. M. Gaensler, Paul Scholz, Daniele Michilli
| Summary:
We present a search for host galaxy associations for the third set of
repeating fast radio burst (FRB) sources discovered by the CHIME/FRB
Collaboration. Using the $sim$ 1 arcmin CHIME/FRB baseband localizations and
probabilistic methods, we identify potential host galaxies of two FRBs,
20200223B and 20190110C at redshifts of 0.06024(2) and 0.12244(6),
respectively. We also discuss the properties of a third marginal candidate host
galaxy association for FRB 20191106C with a host redshift of 0.10775(1). The
three putative host galaxies are all relatively massive, fall on the standard
mass-metallicity relationship for nearby galaxies, and show evidence of ongoing
star formation. They also all show signatures of being in a transitional
regime, falling in the “green valley” which is between the bulk of
star-forming and quiescent galaxies. The plausible host galaxies identified by
our analysis are consistent with the overall population of repeating and
non-repeating FRB hosts while increasing the fraction of massive and bright
galaxies. Coupled with these previous host associations, we identify a possible
excess of FRB repeaters whose host galaxies have
$M_{mathrm{u}}-M_{mathrm{r}}$ colors redder than the bulk of star-forming
galaxies. Additional precise localizations are required to confirm this trend.
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