Calorimetric Dark Matter Detection with Galactic Center Gas Clouds

Amit Bhoonah (The McDonald Institute and Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, K7L 2S8, Canada; ETH Zurich, Ramistrasse 101, 8092 Zurich, Switzerland) ; Joseph Bramante (The McDonald Institute and Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, K7L 2S8, Canada; Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5, Canada) ; Fatemeh Elahi (School of Particles and Accelerators, Institute for Research in Fundamental Sciences IPM, Tehran, Iran) ; Sarah Schon (The McDonald Institute and Department of Physics, Engineering Physics, and Astronomy, Queen’s University, Kingston, Ontario, K7L 2S8, Canada; Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5, Canada)

We demonstrate that dark matter heating of gas clouds, hundreds of parsecs from the Milky Way Galactic Center, provides a powerful new test of dark matter interactions. To illustrate, we set a new bound on nucleon scattering for 10–100 MeV mass dark matter. We also constrain millicharged dark matter models, including those proposed to match the recent EDGES 21 cm absorption anomaly. For Galactic Center gas clouds, the Galactic fields’ magnetic deflection of electromagnetically charged dark matter is mitigated, because the magnetic fields around the Galactic Center are poloidal, as opposed to being aligned parallel to the Milky Way disk. We discuss prospects for detecting dark matter using a population of Galactic Center gas clouds warmed by dark matter.

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Published on:
24 September 2018
Publisher:
APS
Published in:
Physical Review Letters , Volume 121 (2018)
Issue 13
DOI:
https://doi.org/10.1103/PhysRevLett.121.131101
arXiv:
1806.06857
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: