Keck/KCWI 对本地体积矮星系球状星团的光谱分析

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-05-20 DOI:10.1017/pasa.2024.41

D. Forbes, Daniel Lyon, J. Gannon, A. Romanowsky, J. Brodie

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引用次数: 0

摘要

许多附近的矮星系都有球状星团（GC）候选体，需要通过光谱来确认。在这里，我们展示了 15 个已知球状星团和可能与主矮星系有关的候选球状星团的凯克望远镜光谱，以及另外 3 个位于 M31 光环中的候选球状星团的光谱，这些候选球状星团可能是由一个现已解体的矮星系吸积而来的。我们确认了与NGC 247相关的6个星团（年龄介于中老年之间）。它的大部分星团系统还有待光谱学研究。我们还确认了 F8D1 和 DDO190 中的候选 GC，发现它们都是年轻的星团。3 个 M31 光环 GC 的径向速度都与 M31 一致，都很老，而且金属含量很低。它们的年龄和金属性都与低质量卫星星系的吸积相一致。最后，有三个天体被发现是背景星系--两个投影在NGC 247附近，一个（候选GCC7）在IKN矮星系附近。因此，IKN矮星系只有5个被证实的GC，但其特定频率仍然高达124。

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Keck/KCWI Spectroscopy of Globular Clusters in Local Volume Dwarf Galaxies

A number of nearby dwarf galaxies have globular cluster (GC) candidates that require spectroscopic confirmation. Here we present Keck telescope spectra for 15 known GCs and GC candidates that may be associated with a host dwarf galaxy, and an additional 3 GCs in the halo of M31 that are candidates for accretion from a now disrupted dwarf galaxy. We confirm 6 star clusters (of intermediate-to-old age) to be associated with NGC 247. The vast bulk of its GC system remains to be studied spectroscopically. We also confirm the GC candidates in F8D1 and DDO190, finding both to be young star clusters. The 3 M31 halo GCs all have radial velocities consistent with M31, are old and very metal-poor. Their ages and metallicities are consistent with accretion from a low mass satellite galaxy. Finally, three objects are found to be background galaxies – two are projected near NGC 247 and one (candidate GCC7) is near the IKN dwarf. The IKN dwarf thus has only 5 confirmed GCs but still a remarkable specific frequency of 124.

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.