具有GMOS的早期型星系中的球状星团

T. Bridges, M. Beasley, F. Faifer, D. Forbes, J. Forte, K. Gebhardt, D. Hanes, R. Sharples, S. Zepf
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引用次数: 0

摘要

我们展示了我们对早期星系中球状星团(GCs)的长期双子座/GMOS研究的最新结果。到目前为止,我们已经获得了NGCs 3379, 4649, 524, 7332和IC 1459中gc的光度和光谱。我们发现ngc4649的GC颜色分布呈现明显的双峰分布,蓝/红星团的比例随着星系中心半径的增加而增加。我们得到了ngc3379中22个gc的年龄和金属丰度,发现大多数星团看起来很老(10-15 Gyr);然而,有一组4个富含金属的年轻星团,年龄在2-6 Gyr之间。NGC 3379的GC速度色散随着半径的减小而减小,推断出的(本地)质量光比也是如此:根据我们的GC数据,没有证据表明NGC 3379中存在暗物质晕。
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Globular Clusters in Early-Type Galaxies with GMOS
We present recent results from our long-term Gemini/GMOS study of globular clusters (GCs) in early-type galaxies. To date, we have obtained photometry and spectroscopy for GCs in NGCs 3379, 4649, 524, 7332, and IC 1459. We find a clear bimodality in the NGC 4649 GC color distribution, with the fraction of blue/red clusters increasing with galacto-centric radius. We derive ages and metallicities for 22 GCs in NGC 3379, finding that most of the clusters appear old (10–15 Gyr); however, there is a group of 4 metal-rich, younger clusters with ages of 2–6 Gyr. The NGC 3379 GC velocity dispersion decreases with radius, as does the inferred (local) mass-to-light ratio: there is no evidence for a dark matter halo in NGC 3379 based on our GC data.
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