Measuring the evolution of intergalactic gas from z=0 to 5 using the
  kinematic Sunyaev-Zel'dovich effect
  A complete census of baryons in the late universe is a long-standing
challenge due to the intermediate temperate and rarefied character of the
majority of cosmic gas. To gain insight into this problem, we extract
measurements of the kinematic Sunyaev-Zel'dovich (kSZ) effect from the
cross-correlation of angular redshift fluctuations maps, which contain precise
information about the cosmic density and velocity fields, and CMB maps
high-pass filtered using aperture photometry; we refer to this technique as
ARF-kSZ tomography. Remarkably, we detect significant cross-correlation for a
wide range of redshifts and filter apertures using 6dF galaxies, BOSS galaxies,
and SDSS quasars as tracers, yielding a 11 sigma detection of the kSZ effect.
We then leverage these measurements to set constraints on the location,
density, and abundance of gas inducing the kSZ effect, finding that this gas
resides outside dark matter haloes, presents densities ranging from 10 to 250
times the cosmic average, and comprises half of cosmic baryons. Taken together,
these findings indicate that ARF-kSZ tomography provides a nearly complete
census of intergalactic gas from z=0 to 5.
