期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 354, 期 4, 页码 L66-L72出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08434.x
关键词
stellar dynamics; galaxies : individual : Sextans dSph; galaxies : kinematics and dynamics; Local Group; dark matter
We present the line-of-sight radial velocity dispersion profile of the Sextans dwarf spheroidal galaxy (dSph), based on a sample of 88 stars extending to about 1degrees (similar to1.5 kpc). Like the Draco and Ursa Minor dSphs, Sextans shows some evidence of a fall-off in the velocity dispersion at large projected radii, with significance p = 0.96. Surprisingly, the dispersion at the very centre of Sextans is close to zero (with significance p = 0.96). We present evidence which suggests that this latter change in the stellar kinematics coincides with changes in the stellar populations within the dSph. We discuss possible scenarios which could lead to a kinematically and photometrically distinct population at the centre of Sextans.
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