NOAO >   Observing Info >   Approved Programs >   2011A-0164

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Proposal Information for 2011A-0164


PI: Amanda Moffett, University of North Carolina at Chapel Hill, amoffett@physics.unc.edu
Address: Department of Physics and Astronomy, CB 3255, Phillips Hall, Chapel Hill, NC 27599-3255, USA

CoI: Sheila Kannappan, University of North Carolina at Chapel Hill
CoI: Mark Norris, University of North Carolina at Chapel Hill
CoI: Sadegh Khochfar, MPE
CoI: Andreas Berlind, Vanderbilt University

Title: Secondary Disks and Disk Regrowth in S0 Galaxies

Abstract: Early-type galaxies are predicted to regrow late-type disks in hierarchical models of galaxy formation, but the observational confirmation of this process remains largely indirect. We seek to approach this problem kinematically by searching for evidence of disk regrowth in the form of extended secondary disks in S0s (distinct from the small-scale KDCs identified in SAURON). In order to address the possible contribution of secondary disks not indicative of true disk regrowth and the expected variations of secondary disk frequency with mass, color, and environment, we propose deep spectroscopy of a broad sample of 52 S0 galaxies located in the RESOLVE Survey volume. With these data and similar data for ~20 additional S0s, we aim both to resolve conflicting measurements of the frequency of secondary disks in early-type galaxies and to determine the incidence of disk regrowth. Due to weather losses with our previously approved program observations (2010B-0594) and the intrinsically fall and spring nature of our desired sample, we request additional time in 2011A to complete our planned program.


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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