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The Least Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1
Marla Geha, Beth Willman, Josh D. Simon +4
We present Keck/DEIMOS spectroscopy of Segue 1, an ultra-low luminosity (M_V = -1.5) Milky Way satellite companion. While the combined size and luminosity of Segue 1 are consistent…
Mapping the Dark Side with DEIMOS: Globular Clusters, X-ray Gas, and Dark Matter in the NGC 1407 Group
Aaron J. Romanowsky, Jay Strader, Lee R. Spitler +4
NGC 1407 is the central elliptical in a nearby evolved galaxy group apparently destined to become a cluster core. We use the kinematics of globular clusters to probe the dynamics a…
On The Origin of the Blue Tilt in Extragalactic Globular Cluster Systems
Jay Strader, Graeme Smith
Some early-type galaxies show a correlation between color and integrated magnitude among the brighter metal-poor globular clusters (GCs). This phenomenon, known as the blue tilt, i…
A Probable New Globular Cluster in the Galactic Disk
Jay Strader, Henry A. Kobulnicky
We report the discovery of a probable new globular cluster in the disk of the Milky Way. Visible in 2MASS and the GLIMPSE survey, it has an estimated foreground extinction of A_V ~…
A Glimpse into the Past: The Recent Evolution of Globular Clusters
Jasonjot S. Kalirai, Jay Strader, Harvey B. Richer +1
We present the serendipitous discovery of 195 extragalactic globular clusters (GCs) in one of the deepest optical images ever obtained, a 126 orbit HST/ACS imaging study of the nea…
The Peculiar Globular Cluster System of the S0 Galaxy NGC 7457
Laura Chomiuk, Jay Strader, Jean Brodie
We present HST photometry and Keck spectroscopy of globular clusters (GCs) in the nearby S0 galaxy NGC 7457. The V-I color-magnitude diagram of GCs lacks the clear bimodality prese…