Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Masoud Rafiei-Ravandi, Kendrick M. Smith, Dongzi Li, Kiyoshi W. Masui, Alexander Josephy
| Summary:
The CHIME/FRB Project has recently released its first catalog of fast radio
bursts (FRBs), containing 492 unique sources. We present results from angular
cross-correlations of CHIME/FRB sources with galaxy catalogs. We find a
statistically significant ($p$-value $sim 10^{-4}$, accounting for
look-elsewhere factors) cross-correlation between CHIME FRBs and galaxies in
the redshift range $0.3 lesssim z lesssim 0.5$, in three photometric galaxy
surveys: WISE$times$SCOS, DESI-BGS, and DESI-LRG. The level of
cross-correlation is consistent with an order-one fraction of the CHIME FRBs
being in the same dark matter halos as survey galaxies in this redshift range.
We find statistical evidence for a population of FRBs with large host
dispersion measure ($sim 400$ pc cm$^{-3}$), and show that this can plausibly
arise from gas in large halos ($M sim 10^{14} M_odot$), for FRBs near the
halo center ($r lesssim 100$ kpc). These results will improve in future
CHIME/FRB catalogs, with more FRBs and better angular resolution.
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