Constraining dark matter annihilation with HSC Low Surface Brightness
  Galaxies
  Searches for dark matter annihilation signals have been carried out in a
number of target regions such as the Galactic Center and Milky Way dwarf
spheroidal galaxies (dSphs), among a few others. Here we propose low surface
brightness galaxies (LSBGs) asnovel targets for the indirect detection of dark
matter emission. In particular, LSBGs are known to have very large dark matter
contents and be less contaminated by extragalactic gamma-ray sources (e.g.,
blazars) compared to star forming galaxies. We report on an analysis that uses
eight LSBGs (detected by Subaru Hyper Suprime-Cam survey data) with known
redshifts to conduct a search for gamma-ray emission at the positions of these
new objects in Fermi Large Area Telescope data. We found no excesses of
gamma-ray emission and set constraints on the dark matter annihilation
cross-section. We exclude (at the 95% C.L.) dark matter scenarios predicting a
cross-section higher than 10^-23[cm^3/s] for dark matter particles of mass 10
GeV self-annihilating in the b_b channel. Although this constraint is weaker
than the ones reported in recent studies using other targets, we note that in
the near future, the number of detections of new LSBGs will increase by a few
orders of magnitude. We forecast that with the use of the full catalog of
soon-to-be-detected LSBGs the constraint will reach cross-section sensitivities
of ~ 3*10^-25 [cm^3/s] for dark matter particles with masses less than 10 GeV.
