DETECTING THE MILKY WAY'S DARK DISK

被引：69

作者：

Bruch, Tobias ^{[1
]}

Read, Justin ^{[2
]}

Baudis, Laura ^{[1
]}

Lake, George ^{[2
]}

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 696卷 / 01期

关键词：

dark matter; Galaxy: formation; MATTER CANDIDATES; THICK DISKS; GALAXIES; DENSITY; DETECTABILITY; KINEMATICS; HIPPARCOS; UNIVERSE; RAVE;

D O I：

10.1088/0004-637X/696/1/920

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In the standard model of disk galaxy formation, a dark matter disk forms as massive satellites are preferentially dragged into the disk plane and dissolve. Here, we show the importance of the dark disk for direct dark matter detection. The low velocity of the dark disk with respect to the Earth enhances detection rates at low recoil energy. For weakly interacting massive particle (WIMP) masses M-WIMP greater than or similar to 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 is sensitive to M-WIMP, providing stronger mass constraints particularly for MWIMP greater than or similar to 100 GeV/c(2). The annual modulation signal is significantly boosted and the modulation phase is shifted by similar to 3 weeks relative to the dark halo. The variation of the observed phase with recoil energy determines MWIMP, 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 1.4-3.5 when a typical contribution from the dark disk is included.

引用

页码：920 / 923

页数：4

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