AN OFF-CENTER DENSITY PEAK IN THE MILKY WAY'S DARK MATTER HALO?

被引：41
作者：
Kuhlen, Michael [1 ]
Guedes, Javiera [2 ]
Pillepich, Annalisa [3 ]
Madau, Piero [3 ]
Mayer, Lucio [4 ]
机构：
[1] Univ Calif Berkeley, Theoret Astrophys Ctr, Berkeley, CA 94720 USA
[2] ETH, Inst Astron, CH-8049 Zurich, Switzerland
[3] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[4] Univ Zurich, Inst Theoret Phys, CH-8057 Zurich, Switzerland
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 765卷 / 01期
基金：
美国国家科学基金会;
关键词：
dark matter; Galaxy: center; Galaxy: halo; gamma rays: galaxies; methods: numerical; MASSIVE BLACK-HOLE; GALACTIC-CENTER; BAR FORMATION; X-RAY; SPIRAL GALAXIES; STELLAR ORBITS; CORES; EVOLUTION; SIMULATIONS; CONDENSATION;
D O I：
10.1088/0004-637X/765/1/10
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We show that the position of the central dark matter (DM) density peak may be expected to differ from the dynamical center of the Galaxy by several hundred parsecs. In Eris, a high-resolution cosmological hydrodynamics simulation of a realistic Milky-Way-analog disk galaxy, this offset is 300-400 pc (similar to 3 gravitational softening lengths) after z = 1. In its dissipationless DM-only twin simulation ErisDark, as well as in the Via Lactea II and GHalo simulations, the offset remains below one softening length for most of its evolution. The growth of the DM offset coincides with a flattening of the central DM density profile in Eris inward of similar to 1 kpc, and the direction from the dynamical center to the point of maximum DM density is correlated with the orientation of the stellar bar, suggesting a bar-halo interaction as a possible explanation. A DM density offset of several hundred parsecs greatly affects expectations of the DM annihilation signals from the Galactic center. It may also support a DM annihilation interpretation of recent reports by Weniger and Su & Finkbeiner of highly significant 130 GeV gamma-ray line emission from a region 1 degrees.5 (similar to 200 pc projected) away from Sgr A* in the Galactic plane.
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