The Outskirts of Galaxies

Three ongoing studies of the outer regions of galaxies will be discussed in this talk.The first of these studies targets low-luminosity dwarf elliptical (dE) galaxies in the Virgo Cluster. Globular cluster satellites are used as dynamical tracers to measure the mass of the extended dark matter halos of dEs. New results on kinematic anomalies in the outer regions of dEs will also be presented. The second study is of the structure, kinematics, and chemical enrichment of the outer stellar halo of the Andromeda galaxy and its dwarf spheriodal / dwarf elliptical / compact elliptical satellites. The latest results from the SPLASH collaboration will be presented. The third study is of the outer regions of the Milky Way – one that started as a by-product of the above two studies. Topics will include kinematics of substructure in the outer halo, proper motion of stars from deep multi-epoch HST images, and HALO7D: a newly approved deep Keck/DEIMOS spectroscopic survey to measure radial velocities and metallicities of Milky Way halo main sequence turnoff stars.

Puragra Guhathakurta (UCO/Lick Observatory)
KIAA, 1s floor seminar room
Tue, 2014-08-19 12:00 to 13:00