用ELT探测星系核星团
Probing the nuclear star cluster of galaxies with ELTs
摘要：
下一代地基极大望远镜（ELT）的空前灵敏度和空间分辨率将为分辨恒星星族的研究打开一扇全新的窗口。本文研究了用ELT分析核星团恒星星族的可行性。迄今为止，NSC对恒星星族的研究是基于它们的积分光的性质。事实上，即使使用HST，NSC也被视为未解决的源。我们探讨了从主序星的光度测量中直接估算NSC恒星星族年龄的可能性。我们模拟了不同距离和不同恒星星族的NSCs的ELT观测。对每个模拟图像的光度测量进行了详细分析，并报告了光度测量的准确性和完整性。我们发现，主序星的关闭是可以检测到的，因此恒星星族的年龄可以直接估算出来，年老恒星的年龄可达2 Mpc，中等年龄的可达3 Mpc，年轻恒星星族的年龄可达4-5 Mpc。我们发现，对于这一特定的科学案例，TMT和E-ELT的表现是相当的质量。
英文摘要：
The unprecedented sensitivity and spatial resolution of next generation ground-based extremely large telescopes (ELTs) will open a completely new window on the study of resolved stellar populations. In this paper we study the feasibility of the analysis of nuclear star cluster (NSC) stellar populations with ELTs. To date, NSC stellar population studies are based on the properties of their integrated light. NSC are in fact observed as unresolved sources even with the HST. We explore the possibility to obtain direct estimates of the age of NSC stellar populations from photometry of main-sequence turn-off stars. We simulated ELT observations of NSCs at different distances and with different stellar populations. Photometric measurements on each simulated image were analysed in detail and results about photometric accuracy and completeness are reported here. We found that the main-sequence turn-off is detectable -and therefore the age of stellar populations can be directly estimated- up to 2Mpc for old, up to 3 Mpc for intermediate-age and up to 4-5 Mpc for young stellar populations. We found that for this particular science case the performances of TMT and E-ELT are of comparable quality.
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