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
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DOI：
10.1103/physrevd.103.123028
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发表时间：
2019-03
影响因子：
5
通讯作者：
D. Wadekar;G. Farrar
中科院分区：
文献类型：
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作者：
D. Wadekar;G. Farrar
我们利用观测到的富含气体的矮星系来推导出暗物质与普通物质散射的约束条件。我们要求DM与Leo T矮星系中的气体相互作用引起的加热/冷却不超过气体的超低辐射冷却速率。这使我们能够为几乎所有质量范围10 ^{-23}\lesssim m_\mathrm{DM} \lesssim 10^{-10}$ eV的超轻隐藏光子DM设置比所有先前文献更强的边界，对亚GeV毫荷电DM的限制增加了对最近EDGES 21 cm吸收异常的限制，和（iii）直接在低相对速度v\mathrm{rel}\sim 17$ km/s下对DM-重子相互作用的约束。我们的研究开辟了一个新的方向，即利用以前，当前和即将到来的光学和21厘米调查中对富含气体的矮星系的观测来探测标准模型之外的物理学。
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.