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Proposed host galaxies of repeating fast radio burst sources detected by CHIME/FRB

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arxiv 2304.02638 v2 pith:HGX77OAW submitted 2023-04-05 astro-ph.HE

Proposed host galaxies of repeating fast radio burst sources detected by CHIME/FRB

Adaeze L. Ibik , Maria R. Drout , B. M. Gaensler , Paul Scholz , Daniele Michilli , Mohit Bhardwaj , Victoria M. Kaspi , Ziggy Pleunis
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Tomas Cassanelli Amanda M. Cook Fengqiu A. Dong Calvin Leung Kiyoshi W. Masui Jane F. Kaczmarek Katherine J. Lu Aaron B. Pearlman Masoud Rafiei-Ravandi Ketan R. Sand Kaitlyn Shin Kendrick M. Smith Ingrid H. Stairs
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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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Cited by 7 Pith papers

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