Old stars in dwarf irregular galaxies: WLM and NGC3109

被引：0

作者：

Minniti, D ^{[1
]}

Rejkuba, M ^{[1
]}

Zijlstra, AA ^{[1
]}

Alonso, MV ^{[1
]}

Gregg, M ^{[1
]}

机构：

[1] Pontificia Univ Catolica Chile, Dept Astron, Santiago, Chile

来源：

FROM EXTRASOLAR PLANETS TO COSMOLOGY: THE VLT OPENING SYMPOSIUM | 2000年

关键词：

D O I：

10.1007/10720961_43

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present evidence for the existence of old stellar halos in the dwarf irregular galaxies WLM and NGC3109, located in the outskirts of the Local Group. These halos consist of metal-poor ([Fc/H] < -1) and old (t > 10(10) yr) stars, as inferred from deep optical color-magnitude diagrams obtained with the ESO NTT and with STIS on-board the HST. Future VLT spectroscopy will allow us to measure the kinematics of stars in these halos and also to estimate the dark matter content of these galaxies.

引用

页码：298 / 302

页数：5

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