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Accepted manuscript

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

Published online by Cambridge University Press:  23 May 2024

Duncan A. Forbes Open the ORCID record for Duncan A. Forbes [Opens in a new window] ,
Daniel Lyon ,
Jonah Gannon ,
Aaron J. Romanowsky  and
Jean P. Brodie
Duncan A. Forbes*
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
Daniel Lyon
Affiliation:
School of Chemistry and Physics, Science and Engineering Faculty, Queensland University of Technology, Gardens Point Campus, Brisbane, QLD 4001, Australia
Jonah Gannon
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
Aaron J. Romanowsky
Affiliation:
Department of Physics and Astronomy, San José State University, One Washington Square, San Jose, CA 95192, USA Department of Astronomy & Astrophysics, university of California, Santa Cruz, CA 95064, USA
Jean P. Brodie
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia School of Chemistry and Physics, Science and Engineering Faculty, Queensland University of Technology, Gardens Point Campus, Brisbane, QLD 4001, Australia
*
Author for correspondence: D. A. Forbes, Email: dforbes@swin.edu.au
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Abstract

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.

Keywords

galaxies: dwarfgalaxies: star clusters: generalgalaxies: halosgalaxies: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 9
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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