NOAO >   Observing Info >   Approved Programs >   2010B-0532

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Proposal Information for 2010B-0532


PI: Johannes Ludwig, University of Heidelberg, ludwig@ari.uni-heidelberg.de
Address: Astronomisches Rechen Institut, Moenchhofstr 12-14, Heidelberg 69120, Germany

CoI: John (Jay) Gallagher, University of Wisconsin-Madison
CoI: Eva Grebel, University of Heidelberg

Title: The Galaxy Group Environment: A Survey for Dwarfs & Tidal debris

Abstract: Most galaxies are members of groups in which spheres of gravitational influence divide between the group as a whole and individual galaxies. Within the outer boundaries of galaxies long lived satellites of relatively high mass can survive, retaining a record of the types of dwarf objects likely to have been accreted to build galaxies. Further inwards, streams and plumes of stars reveal other past merger events, giving us insight into the rates of growth of galaxies. Using the refurbished Mosaic camera on the 4-m telescope, we will study stellar features within the halos and along the outer boundaries of galaxies to build an empirical understanding of the characteristics of dwarf companions and tidal features associated with normal galaxies in a range of group environments. We will accomplish this through an extension of a program begun with the WIYN 0.9-m telescope to obtain imaging reaching a surface brightness of (mu)_g ~27 mag arcsec^-2 over a few arcsec^2. This will be the most sensitive survey to combine a study of tidal features and dwarf satellites as a window into the hierarchical growth of galaxies.


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



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