机构:
San Jose State Univ, Dept Phys & Astron, One Washington Sq, San Jose, CA 95192 USA
Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USASwinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
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.
机构:
Herzberg Inst Astrophys, Natl Res Council Canada, Dominion Astrophys Observ, Victoria, BC V9E 2E7, CanadaHerzberg Inst Astrophys, Natl Res Council Canada, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada
机构:
Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9B 2E7, CanadaNatl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9B 2E7, Canada
机构:
Natl Res Council Canada, Herzberg Inst Astrophys, Domin Astrophys Observ, Victoria, BC V9E 2E7, CanadaNatl Res Council Canada, Herzberg Inst Astrophys, Domin Astrophys Observ, Victoria, BC V9E 2E7, Canada
机构:
Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USAUniv Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
Larsen, SS
Brodie, JP
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机构:Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
Brodie, JP
Beasley, MA
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机构:Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
Beasley, MA
Forbes, DA
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机构:Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
机构:
Natl Res Council Canada, Dominion Astrophys Observ, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, CanadaNatl Res Council Canada, Dominion Astrophys Observ, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada