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arXiv 0804.2896astro-ph
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探测银河系的暗盘

Detecting the Milky Way's Dark Disk

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

摘要:

在LambdaCDM中,大质量的卫星被动力摩擦拖入盘平面,在那里它们溶解成恒星厚盘和更大质量的暗物质盘。暗盘独特的运动学与也进入卫星的恒星相匹配。暗盘相对于地球的较低速度增强了在低反冲能量下的探测率。当WIMP质量大于50 GeV/c^2时,在5 - 20 keV的反冲能量范围内,探测率增加到原来的3倍。将其与更高能量下的速率进行比较,将改善对WIMP质量的约束,特别是对于大于100 GeV/c^2的质量。暗盘的年调制信号显著增强,其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也可以用来确定WIMP的质量。从目前的实验中的WIMP相互作用的截面的限制,提高了1.4至3.5的因素时,一个典型的贡献,从暗盘。

英文摘要:

In LambdaCDM, massive satellites are dragged into the disk-plane by dynamical friction where they dissolve into a stellar thick disk and a more massive dark matter disk. The distinctive kinematics of the dark disk matches the stars that also entered in the satellites. The lower velocities of the dark disk with respect to the Earth enhances detection rates at low recoil energy. For WIMP masses > 50 GeV/c^2, 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 will improve constraints on the WIMP mass, particularly for masses > 100 GeV/c^2. The annual modulation signal of the dark disk is significantly boosted and its modulation phase is shifted by ~3 weeks relative to the dark halo. The variation of the observed phase with recoil energy can also be used to determine the WIMP mass once the dark disk properties are fixed by future astronomical surveys. The constraints on the WIMP interaction cross section from current experiments improve by factors of 1.4 to 3.5 when a typical contribution from the dark disk is included.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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