Kavli Affiliate: Kiyoshi Masui
| First 5 Authors: Haochen Wang, Kiyoshi Masui, Shion Andrew, Emmanuel Fonseca, B. M. Gaensler
| Summary:
The dispersion of extragalactic fast radio bursts (FRBs) can serve as a
powerful probe of the diffuse plasma between and surrounding galaxies, which
contains most of the Universe’s baryons. By cross-correlating the dispersion of
background FRBs with the locations of foreground galaxies, we can study the
relative spatial distributions of plasma and galaxies on scales of 0.1 to 50
Mpc, which are strongly affected by feedback processes in galaxy formation.
Here we present the measurement of the dispersion$unicode{x2013}$galaxy
angular cross-power spectrum between 2873 FRBs from the Second CHIME/FRB
Catalog and nearly 6 million galaxies from the Dark Energy Spectroscopic
Instrument (DESI) Legacy Imaging Survey. Over five photometric galaxy redshift
bins spanning $0.05 < z <0.5$ and at 5.1$sigma$ significance, we make the
first definitive detection of spatial correlations in FRB dispersion measure
due to cosmic structure. While parameter inferences should be interpreted with
caution because of incomplete modelling of both the signal and systematic
errors, our data indicate that the plasma$unicode{x2013}$galaxy cross-power
spectrum cuts off relative to the matter power spectrum at a scale
$k_textrm{cut}^{-1}=0.9^{+0.4}_{-0.4},textrm{Mpc}$. This scale is consistent
with those X-ray stacking analyses that suggest dark-matter halos with
group-scale masses are largely evacuated of their baryons by feedback
processes. Our study demonstrates that FRBs are promising tools to discern the
physics of baryonic structure formation and will only become more powerful as
FRB surveys expand.
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