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23 papers · 2 filters
Linking dwarf galaxies to halo building blocks with the most metal-poor star in Sculptor
Anna Frebel, Evan Kirby, Joshua D. Simon
Current cosmological models indicate that the Milky Way's stellar halo was assembled from many smaller systems. Based on the apparent absence of the most metal-poor stars in presen…
HST's hunt for intermediate-mass black holes in star clusters
Julio Chanamé, Justice Bruursema, Rupali Chandar +3
Establishing or ruling out, either through solid mass measurements or upper limits, the presence of intermediate-mass black holes (IMBHs) at the centers of star clusters would prof…
Chemical Abundances of Seven Irregular and Three Tidal Dwarf Galaxies in the M81 Group
Kevin V. Croxall, Liese van Zee, Henry Lee +5
We have derived nebular abundances for 10 dwarf galaxies belonging to the M81 Group, including several galaxies which do not have abundances previously reported in the literature.…
Does Stellar Feedback Create HI Holes? An HST/VLA Study of Holmberg II
Daniel R. Weisz, Evan D. Skillman, John M. Cannon +4
We use deep HST/ACS F555W and F814W photometry of resolved stars in the M81 Group dwarf irregular galaxy Ho II to study the hypothesis that the holes identified in the neutral ISM…
Magellan Spectroscopy of Low-Redshift Active Galactic Nuclei
Luis C. Ho, Minjin Kim
We present an atlas of moderate-resolution (R ~ 1200-1600) optical spectra of 94 low-redshift (z < 0.5) active galactic nuclei taken with the Magellan 6.5 m Clay Telescope. The spe…
M31 Globular Cluster Abundances from High-Resolution, Integrated-Light Spectroscopy
J. E. Colucci, R. A. Bernstein, S. Cameron +2
We report the first detailed chemical abundances for 5 globular clusters (GCs) in M31 from high-resolution (R ~ 25,000) spectroscopy of their integrated light. These GCs are the fi…