NOAO >   Observing Info >   Approved Programs >   2010B-0366

Small NOAO Logo

Proposal Information for 2010B-0366


PI: Geraint Lewis, University of Sydney (Astrophysics), geraint.lewis@sydney.edu.au
Address: Astrophysics Department, School of Physics, A28, Sydney, NSW 2006, Australia

CoI: Alan McConnachie, Herzberg Institute of Astrophysics
CoI: Michael Irwin, University of Cambridge
CoI: R. Michael Rich, UC Los Angeles
CoI: Rodrigo Ibata, Observatoire de Strasborg

Title: Cubs in the Litter: Spectroscopy of New Andromodean Dwarfs from PAndAS

Abstract: We will use Gemini/GMOS to obtain spectroscopy of Red Giant Branch (RGB) stars in four new dwarf galaxies identified within the Pan-Andromeda Archaeological Survey (PAndAS). With these data, we will measure the key physical properties of the dwarfs, namely their radial velocities, internal kinematics and spectroscopic metallicities. Such measurements are essential in determining the dwarfs' fundamental characteristics; namely their internal dynamics, dark matter content, and clues to star formation and evolutionary histories. PAndAS is revolutionizing our view of our nearest cosmic neighbour, the Andromeda Galaxy, revealing a wealth of previously undetected substructure and dwarf galaxies, and these new observations are indispensable in unraveling global properties of M31's population of satellites and their relation to the M31 galaxy and its extended stellar halo. Andromeda is one of the few targets available which can provide direct tests of predictions of the distribution of mass and light in galaxy haloes and satellite galaxies, but a detailed knowledge of the physical properties of such substructure is essential; the excellent capabilities of Gemini/GMOS makes it one of the few facilities which can obtain the required spectroscopic data.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010B-0366

noaoprop-help@noao.edu

Small NOAO Logo