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The ongoing assembly of a central cluster galaxy: Phase-space substructures in the halo of M87
Aaron J. Romanowsky, Jay Strader, Jean P. Brodie +5
The halos of galaxies preserve unique records of their formation histories. We carry out the first combined observational and theoretical study of phase-space halo substructure in…
Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems
Lee R. Spitler, Aaron J. Romanowsky, Jürg Diemand +4
Exploiting a fundamental characteristic of galaxy assembly in the ΛCDM paradigm, the observed spatial biasing and kinematics of metal-poor globular star clusters are used to constr…
Wide-field imaging of NGC 4365's globular cluster system: The third subpopulation revisited
Christina Blom, Lee R. Spitler, Duncan A. Forbes
Analysis of the globular cluster (GC) system of the giant elliptical (E3) galaxy NGC 4365, from eight Hubble Space Telescope/Advanced Camera for Surveys (ACS) pointings and a wide-…
The Relationships Among Compact Stellar Systems: A Fresh View of Ultra Compact Dwarfs
Jean P. Brodie, Aaron J. Romanowsky, Jay Strader +1
We use a combined imaging and spectroscopic survey of the nearby central cluster galaxy, M87, to assemble a sample of 34 confirmed ultra compact dwarfs (UCDs) with half-light radii…
Spectra of globular clusters in the Sombrero galaxy: evidence for spectroscopic metallicity bimodality
Alan Alves-Brito, George K. T. Hau, Duncan A. Forbes +4
We present a large sample of over 200 integrated-light spectra of confirmed globular clusters (GCs) associated with the Sombrero (M104) galaxy taken with the DEIMOS instrument on t…
The Fossil Record of Two-phase Galaxy Assembly: Kinematics and Metallicities in the Nearest S0 Galaxy
Jacob A. Arnold, Aaron J. Romanowsky, Jean P. Brodie +5
We present a global analysis of kinematics and metallicity in the nearest S0 galaxy, NGC 3115, along with implications for its assembly history. The data include high-quality wide-…