Keck/KCWI Spectroscopy of Globular Clusters in Local Volume Dwarf Galaxies
Publications of the Astronomical Society of Australia(2024)
摘要
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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