Gas-rich dwarf galaxies as a new probe of dark matter interactions with ordinary matter

  title={Gas-rich dwarf galaxies as a new probe of dark matter interactions with ordinary matter},
  author={Digvijay Shivaji Wadekar and Glennys R. Farrar},
We use observations of gas-rich dwarf galaxies to derive constraints on dark matter scattering with ordinary matter. We require that heating/cooling due to DM interacting with gas in the Leo T dwarf galaxy not exceed the ultra-low radiative cooling rate of the gas. This enables us to set (i) stronger bounds than all the previous literature on ultra-light hidden photon DM for nearly all of the mass range 10−23 . mDM . 10−10 eV, (ii) limits on sub-GeV millicharged DM which add to the constraints… 

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