期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 424, 期 1, 页码 L44-L48出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1745-3933.2012.01283.x
关键词
stars; Galaxy: halo; Galaxy: kinematics and dynamics; dark matter
资金
- Science and Technology Facilities Council (STFC)
- Royal Society
- Science and Technology Facilities Council [ST/F00723X/1, ST/J001538/1, ST/H00243X/1] Funding Source: researchfish
- STFC [ST/F00723X/1, ST/J001538/1] Funding Source: UKRI
We use distant blue horizontal branch stars with Galactocentric distances 16 < r < 48 kpc as kinematic tracers of the Milky Way dark halo. We model the tracer density as an oblate, power law embedded within a spherical power-law potential. Using a distribution function method, we estimate the overall power-law potential and the velocity anisotropy of the halo tracers. We measure the slope of the potential to be gamma similar to 0.4, and the overall mass within 50 kpc is similar to 4 x 10(11)M(circle dot). The tracer velocity anisotropy is radially biased with beta similar to 0.5, which is in good agreement with local solar neighbourhood studies. Our results provide an accurate outer circular velocity profile for the Milky Way and suggest a relatively high-concentration dark matter halo (c(vir) similar to 20).
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