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arXiv 1908.00774astro-ph.GA
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利用MUSE-AO观测约束FCC47中大核星团的形成

Using MUSE-AO observations to constrain the formation of the large nuclear star cluster in FCC47

Katja Fahrion, Mariya Lyubenova, Glenn van de Ven, Michael Hilker

摘要:

至少70%的星系中都有核星团(NSC),但它们的形成路径仍然不清楚。在最常见的情况下,NSC从星系中央的天然气库原位形成,通过合并球状星团(GC),或通过两者的组合。由于这两种情况对NSC的角动量和恒星星族性质提出了不同的期望,因此有必要同时计算恒星光、NSC和GC。使用现代积分场单元(如多单元光谱探测器(MUSE))进行宽场观测可以进行此类研究。然而,在大的距离,神经干细胞通常没有解决的MUSE观测。早型星系FCC 47的距离为$\sim$ 20 Mpc的特别大的NSC(R_eff $\sim$ 66 pc)是一个例外,因此是限制外部星系NSC形成的理想实验室。

英文摘要:

Nuclear star clusters (NSCs) are found in at least 70% of all galaxies, but their formation path is still unclear. In the most common scenarios, NSCs form in-situ from the galaxy's central gas reservoir, through merging of globular clusters (GCs), or through a combination of the two. As the scenarios pose different expectations for angular momentum and stellar population properties of the NSC in comparison to the host galaxy and the GC system, it is necessary to characterise the stellar light, NSC, and GCs simultaneously. Wide-field observations with modern integral field units such as the Multi Unit Spectroscopic Explorer (MUSE) allow to perform such studies. However, at large distances, NSCs usually are not resolved in MUSE observations. The particularly large NSC (R_eff $\sim$ 66 pc) of the early-type galaxy FCC47 at distance of $\sim$ 20 Mpc is an exception and is therefore an ideal laboratory to constrain NSC formation of external galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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