Fadely, Ross; Willman, Beth; Geha, Marla; Walsh, Shance; Munoz, Ricardo; Jerjen, Helmut; Vargas, Luis; Da Costa, Gary
We investigate the kinematic and photometric properties of the Segue 3 Milky Way companion using Keck/DEIMOS spectroscopy and Magellan/IMACS g- and r-band imaging. Using maximum likelihood methods to analyze the photometry, we study the structure and stellar population of Segue 3. We find that the half-light radius of Segue 3 is 26″ ±5″ (2.1 ±0.4pc, for a distance of 17kpc) and the absolute magnitude is a mere MV = 0.0 ± 0.8 mag, making Segue 3 the least luminous old stellar system known. We...[Show more]
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