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arXiv 0811.4172astro-ph
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当前和未来实验中银河系暗盘的特征

Signatures of the Milky Way's Dark Disk in Current and Future Experiments

T. Bruch, J. Read, L. Baudis, G. Lake

备注：
5 pages, 7 figures, To appear in the proceedings of Identification of Dark Matter 2008 (IDM2008), Stockholm, 18-22 August 2008; corrected one reference
发表信息：
PoS idm2008:049,2008
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摘要：

在盘状星系的分级结构形成模型中，一个暗物质盘的形成是由于大质量的卫星优先被拖到盘平面中溶解。在这里，我们量化的重要性，这个黑暗的磁盘直接和间接的暗物质检测。暗盘相对于地球的低速度增强了在低反冲能量的直接探测实验中的探测率。对于质量M_{WIMP} >~ 50 GeV的WIMP，在5 - 20 keV的反冲能范围内，探测率增加到3倍。将其与较高能量下的速率进行比较，对M_{WIMP}敏感，提供了更强的质量约束，特别是对于M_{WIMP} >~100 GeV。年调制信号被暗盘显著增强，并且调制相位相对于暗晕移动约3周。一旦暗盘的性质被未来的天文观测所确定，观测到的相位随反冲能量的变化就决定了M_{WIMP}。相对于太阳系而言，暗盘中粒子的低速显着提高了太阳中WIMP的捕获率，导致来自太阳的中微子通量增加，这可以在当前和未来的中微子望远镜中检测到。当rho_d/rho_h=0.5时，暗盘对地球中微子反转换产生的μ子通量的贡献比SHM增加了约5倍。

英文摘要：

In hierarchical structure formation models of disk galaxies, a dark matter disk forms as massive satellites are preferentially dragged into the disk-plane where they dissolve. Here, we quantify the importance of this dark disk for direct and indirect dark matter detection. The low velocity of the dark disk with respect to the Earth enhances detection rates in direct detection experiments at low recoil energy. For WIMP masses M_{WIMP} >~ 50 GeV, the detection rate increases by up to a factor of 3 in the 5 - 20 keV recoil energy range. Comparing this with rates at higher energy is sensitive to M_{WIMP}, providing stronger mass constraints particularly for M_{WIMP}>~100 GeV. The annual modulation signal is significantly boosted by the dark disk and the modulation phase is shifted by ~3 weeks relative to the dark halo. The variation of the observed phase with recoil energy determines M_{WIMP}, once the dark disk properties are fixed by future astronomical surveys. The low velocity of the particles in the dark disk with respect to the solar system significantly enhances the capture rate of WIMPs in the Sun, leading to an increased flux of neutrinos from the Sun which could be detected in current and future neutrino telescopes. The dark disk contribution to the muon flux from neutrino back conversion at the Earth is increased by a factor of ~5 compared to the SHM, for rho_d/rho_h=0.5.

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