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Keck/KCWI spectroscopy of globular clusters in local volume dwarf galaxies
被引:1
|作者:
Forbes, Duncan A.
[1
]
Lyon, Daniel
[2
]
Gannon, Jonah
[1
]
Romanowsky, Aaron J.
[3
,4
]
Brodie, Jean P.
[1
,4
]
机构:
[1] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
[2] Queensland Univ Technol, Sci & Engn Fac, Sch Chem & Phys, Gardens Point Campus, Brisbane, Qld 4001, Australia
[3] San Jose State Univ, Dept Phys & Astron, One Washington Sq, San Jose, CA 95192 USA
[4] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
来源:
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
|
2024年
/
41卷
基金:
美国国家航空航天局;
关键词:
galaxies: dwarf;
galaxies: star clusters: general;
galaxies: halos;
galaxies: formation;
OUTER HALO;
SYSTEMS;
D O I:
10.1017/pasa.2024.41
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
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 six 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 three M31 halo GCs all have radial velocities consistent with M31 and 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 five confirmed GCs but still a remarkable specific frequency of 124.
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