A TROUBLESOME PAST: CHEMODYNAMICS OF THE FORNAX DWARF SPHEROIDAL

被引：51

作者：

Amorisco, N. C. ^{[1
]}

Evans, N. W. ^{[1
]}

机构：

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 756卷 / 01期

关键词：

galaxies: dwarf; galaxies: individual (Fornax); galaxies: interactions; galaxies: kinematics and dynamics; ELLIPTIC GALAXIES; PROPER MOTIONS; SATELLITES; VELOCITIES; CLUSTERS; SCULPTOR; CARINA; STARS; DSPH;

D O I：

10.1088/2041-8205/756/1/L2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present compelling evidence for the complexity of the Fornax dwarf spheroidal. By disentangling three different stellar subpopulations in its red giant branch, we are able to study in detail the dependence between kinematics and metallicity. A well-defined ordering in velocity dispersion, spatial concentration, and metallicity is evident in the subpopulations. We also present evidence for a significant misalignment between the angular momentum vectors of the old-and intermediate-age populations. According to the Hubble Space Telescope measurement of Fornax's proper motion, this corresponds to counter-rotation. These ingredients are used to construct a novel evolutionary history of the Fornax dwarf spheroidal, characterized as a late merger of a bound pair.

引用

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