Papers › Gas-rich dwarf galaxies as a new probe of dark matter interactions with ordinary matter
Gas-rich dwarf galaxies as a new probe of dark matter interactions with ordinary matter
Digvijay Wadekar, Glennys R. Farrar
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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≲m_(DM) ≲10⁻¹⁰ eV, (ii) limits on sub-GeV millicharged DM which add to the constraints on the recent EDGES 21cm absorption anomaly, and (iii) constraints on DM-baryon interactions directly at low relative velocities vᵣₑₗ∼17 km/s. Our study opens a new direction at using observations of gas-rich dwarf galaxies from previous, current and upcoming optical and 21cm surveys to probe physics beyond the standard model.
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