NOAO >   Observing Info >   Approved Programs >   2011B-0396

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Proposal Information for 2011B-0396


PI: Alan McConnachie, NRC Herzberg Institute of Astrophysics, alan.mcconnachie@nrc-cnrc.gc.ca
Address: Dominion Astrophysical Observatory, 5071 West Saanich Rd, Victoria, BC V9E2E7, Canada

CoI: Patrick Cote, NRC Herzberg Institute of Astrophysics
CoI: Mike Irwin, University of Cambridge
CoI: Rodrigo Ibata, Observatoire de Strasbourg
CoI: Aaron Dotter, Space Telescope Science

Title: Deconvolving the stellar haloes of Andromeda and the Milky Way

Abstract: We propose DDO51 photometry of 30 fields in the environs of M31 and M33, targeting newly discovered dwarf galaxies, vast stellar substructures and the stellar halo. Using this photometry, we will conduct accurate dwarf-giant separation in these fields, to allow the structural properties of these features (surface brightness profiles, luminosity, radial extent) to be robustly calculated. This photometry will be used in conjunction with contiguous CFHT/Megaprime photometry over > 350 square degrees which reveal an unrivaled panorama of galaxy structure and interactions. Many of the observed structures are extremely faint, and correctly removing foreground contamination is vital to correctly estimate their properties. Our fields sample the full extent of the survey area, thereby enabling us to map the variation of the Milky Way foreground over our survey area. We will incorporate these data into Galactic models to robustly separate the contribution of stellar sources from the Andromeda halo and the Milky Way. Deviations from the model will yield a direct handle on Milky Way substructure over > 350 square degrees.


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NOAO >   Observing Info >   Approved Programs >   2011B-0396

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