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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606484.0, MPI für Astronomie / Publikationen_mpia
Andromeda and the Seven Dwarfs
Authors:Brasseur, C.; Rix, H. W.; Martin, N.; Prugniel, P.; Vauglin, I.
Publisher:EDP Sciences
Date of Publication (YYYY-MM-DD):2011
Title of Proceedings:CRAL - 2010: A Universe of Dwarf Galaxies
Start Page:353
End Page:354
Volume (in Series):48
Name of Conference/Meeting:CRAL - 2010: A Universe of Dwarf Galaxies
Place of Conference/Meeting:Lyon, France
Audience:Not Specified
Abstract / Description:With the new generation of wide-field surveys, our understanding of the Andromeda satellite system has dramatically improved in recent years. Since 2004, 12 new dwarf galaxies have been discovered around Andromeda, doubling the number of previously known companions. What are the properties of these newly discovered dwarfs and what do they tell us about galaxy formation? Are these systems bound? Do they show evidence of multiple star formation epochs? To better understand the stellar populations of the faintest dwarfs around M 31, we have used the Large Binocular Camera (LBT) and Suprime-Cam (Subaru) to obtain photometric observations of And X, And XVII, And XVIII, And XIX, And XX, And XXI and And XXII. Reaching below the horizontal branch, these observations have allowed for accurate distance determinations to be made, together with metallicity estimates based on the red giant branch stars. Our analysis shows our 7 dwarfs to be metal poor and with large spreads in [Fe/H], it strongly suggests multiple generations of stars are present in And X, And XVII, And XVIII, and And XIX, And XXI.
Comment of the Author/Creator:Date: 2011, July 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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