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

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arxiv 2405.11749 v1 pith:4TLD4Y5O submitted 2024-05-20 astro-ph.GA

classification astro-ph.GA
keywords dwarfcandidatesclustersgalaxiesgalaxyaccretionassociatedconfirm
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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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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Why do some Ultra Diffuse Galaxies have Rich Globular Cluster Systems?

    astro-ph.GA 2024-12 conditional novelty 5.0 of 10

    A two-parameter model shows that ultra diffuse galaxies with globular cluster mass fractions near 10% likely formed clusters very efficiently while destroying only a modest fraction of them.

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