出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We use the VIRUS-W Integral Field Spectrograph to simultaneously obtain radial velocities for 17 stars in the central 105′′ × 55′′of the Draco dwarf spheroidal (dSph) galaxy. We apply a colormagnitude diagram filter to these stars which leaves 12 probable Draco members. From these 12 member stars we reconstruct a Line-of-Sight Velocity Distribution (LOSVD) and calculate a velocity dispersion of s =16.1+0.8 −5.5 km s−1. This LOSVD will allow us to dynamically model the center of the galaxy on smaller spatial scales where we hope to determine the slope of the dark matter density profile as well as investigate the possibility of an intermediate-mass black hole.
