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
dispersion measure 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 $zapprox0.32$. We estimate that the host halo, along with an
intervening halo at redshift $zapprox0.12$, accounts for at least $sim$$30%$
of the extragalactic DM. Our results strongly motivate incorporating galaxy
group and cluster catalogs into direct host association pipelines for FRBs with
$lesssim$$1’$ localization precision, effectively utilizing the two-point
information to constrain FRB properties such as their redshift and DM
distributions. 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 in FRB-galaxy correlations
due to intervening free electrons over angular scales
$sim$$0mbox{$.!!^circ$}5$.
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