Searching for Sterile Neutrino with X-ray Intensity Mapping
  The cosmological X-ray emission associated to the possible radiative decay of
sterile neutrinos is composed by a collection of lines at different energies.
For a given mass, each line corresponds to a given redshift. In this work, we
cross correlate such line emission with catalogs of galaxies tracing the dark
matter distribution at different redshifts. We derive observational prospects
by correlating the X-ray sky that will be probed by the eROSITA and Athena
missions with current and near future photometric and spectroscopic galaxy
surveys. A relevant and unexplored fraction of the parameter space of sterile
neutrinos can be probed by this technique.
