First evidence for an extended dark halo in the draco dwarf spheroidal

被引：1

作者：

Kleyna, J ^{[1
]}

Wilkinson, M ^{[1
]}

Evans, NW ^{[1
]}

Gilmore, G ^{[1
]}

机构：

[1] Inst Astron, Cambridge CB3 0HA, England

来源：

MASS OF GALAXIES AT LOW AND HIGH REDSHIFT | 2003年

关键词：

D O I：

10.1007/10899892_5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new velocity data set in the Draco dwarf spheroidal, containing the velocities of 159 giant stars extending to large radii. We fit this data set with a family of models parameterised by the orbital anisotropy and the dark matter halo scale. We are able to rule out a mass follows light model at the 2.5sigma, significance level; we also find that Draco possesses a dark halo with a density profile producing a near-flat rotation curve.

引用

页码：16 / 17

页数：2