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21 papers · 2 filters
The Extragalactic Origin of the Arcturus Group
Julio F. Navarro, Amina Helmi, Kenneth C. Freeman +1
We reanalyze the group of stars associated kinematically with Arcturus (Eggen 1971), and confirm that they constitute a peculiar grouping of metal-poor stars with similar apocentri…
Intergalactic HII Regions Discovered in SINGG
E. V. Ryan-Weber, G. R. Meurer, K. C. Freeman +3
A number of very small isolated HII regions have been discovered at projected distances up to 30 kpc from their nearest galaxy. These HII regions appear as tiny emission line objec…
The Globular Cluster System of NGC 5128 II. Ages, Metallicities, Kinematics, and Formation
Eric W. Peng, Holland C. Ford, Kenneth C. Freeman
We present a study of the nearby post-merger giant elliptical galaxy, NGC 5128 (Centaurus A), in which we use the properties of its globular cluster (GC) and planetary nebula (PN)…
The Globular Cluster System of NGC 5128 I. Survey and Catalogs
Eric W. Peng, Holland C. Ford, Kenneth C. Freeman
We present the results of a photometric and spectroscopic survey of the globular cluster system of NGC 5128 (Centaurus A), a galaxy whose proximity makes it an important target for…
Shell Structure in the Fornax Dwarf Spheroidal Galaxy
Matthew Coleman, G. S. Da Costa, Joss Bland-Hawthorn +3
We present initial results from a wide field photometric survey of the Fornax dwarf spheroidal (dSph) galaxy. The focus here is on a small overdensity of stars located approximatel…
The Planetary Nebula System and Dynamics in the Outer Halo of NGC 5128
Eric W. Peng, Holland C. Ford, Kenneth C. Freeman
The halos of elliptical galaxies are faint and difficult to explore, but they contain vital clues to both structure and formation. We present the results of an imaging and spectros…