NOAO >   Observing Info >   Approved Programs >   2009B-0112

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Proposal Information for 2009B-0112


PI: Alan McConnachie, Herzberg Institute of Astrophysics, alan.mcconnachie@nrc-cnrc.gc.ca
Address: National Research Council of Canada, 5071 West Saanich Road, RR. 5, Victoria, British Columbia, V9E 2E7, Canada

CoI: Scott Chapman, University of Cambridge
CoI: Rodrigo Ibata, Observatoire de Strasbourg
CoI: Mike Irwin, University of Cambridge
CoI: Timothy Davidge, Herzberg Institute of Astrophysics
CoI: Geraint Lewis, University of Sydney (Astronomy)
CoI: Nicolas Martin, Max Planck Institute for Astronomy
CoI: Patrick Cote, Herzberg Institute of Astrophysics
CoI: Thomas Puzia, Herzberg Institute of Astrophysics
CoI: R. Michael Rich, UC Los Angeles
CoI: Annette Ferguson, University of Edinburgh

Title: The dynamics of the Andromeda sub-group: spectroscopy of two new dwarf galaxies around M31

Abstract: We propose to obtain Gemini/GMOS spectroscopy of bright stars in two newly discovered dwarf galaxies around M31, And XX and XXI, discovered by our group within the past year. Together with our other recent discoveries (11 dwarf galaxies in the past 3 years), these represent a significant increase in the satellite population of this galaxy. The radial velocities, internal kinematics and spectroscopic metallicities of these dwarfs are basic and fundamental quantities which are required for future detailed studies of the dynamics, dark matter content, star formation and evolutionary histories of individual dwarfs, the population of M31 satellites, the M31 galaxy and its extended halo. M31 is one of the few targets available which can provide direct tests of, and constraints on, predictions of the distribution of mass and light in galaxy haloes and satellite galaxies; Gemini/GMOS is one of the few facilities capable of obtaining the required spectroscopic data.


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