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arXiv · 1903.12190

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

Digvijay Wadekar·Glennys R. Farrar
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Abstract

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 $10^{-23}\lesssim m_\mathrm{DM} \lesssim 10^{-10}$ 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 $v_\mathrm{rel}\sim 17$ 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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Digvijay Wadekar, Glennys R. Farrar. 2019-03-28. Gas-rich dwarf galaxies as a new probe of dark matter interactions with ordinary matter. https://doi.org/10.1103/physrevd.103.123028

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