Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Masoud Rafiei-Ravandi, Kendrick M. Smith, D. Michilli, Ziggy Pleunis, Mohit Bhardwaj
| Summary:
We present results from angular cross-correlations between select samples of
CHIME/FRB repeaters and galaxies in three photometric galaxy surveys, which
have shown correlations with the first CHIME/FRB catalog containing repeating
and nonrepeating sources: WISE$times$SCOS, DESI-BGS, and DESI-LRG. We find a
statistically significant correlation ($p$-value $<0.001$, after accounting for
look-elsewhere factors) between a sample of repeaters with extragalactic DM
$>395$ pc cm$^{-3}$ and WISE$times$SCOS galaxies with redshift $z>0.275$. We
demonstrate that the correlation arises surprisingly because of a statistical
association between FRB 20200320A (extragalactic DM $approx550$ pc cm$^{-3}$)
and a galaxy group in the same dark matter halo at redshift $zapprox0.32$.
Based on our results, we suggest incorporating galaxy group and cluster
catalogs into direct host association pipelines for FRBs with $lesssim1’$
localization precision, effectively utilizing the two-point information to
constrain FRB properties such as their redshift. In addition, we find marginal
evidence for a negative correlation at 99.4% CL between a sample of repeating
FRBs with baseband data (median extragalactic DM $=354$ pc cm$^{-3}$) and
DESI-LRG galaxies with redshift $0.3le z<0.45$, suggesting that the repeaters
might be more prone than apparent nonrepeaters to propagation effects due to
intervening free electrons over angular scales $sim0mbox{$.!!^circ$}5$.
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