NOAO >   Observing Info >   Approved Programs >   2013A-0437

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Proposal Information for 2013A-0437


PI: Erik A. Hoversten, University of North Carolina- Chapel Hill, ehoverst@live.unc.edu
Address: Physics Department, Phillips Hall, CB #3255, Chapel Hill, NC 27599-3255, USA

CoI: Sheila Kannappan, University of North Carolina- Chapel Hill
CoI: David Stark, University of North Carolina- Chapel Hill
CoI: John Salzer, Indiana University
CoI: Kathleen Eckert, University of North Carolina- Chapel Hill
CoI: Amanda Moffett, University of North Carolina- Chapel Hill

Title: The Origin of Gas in Post-Starburst E/S0 Galaxies

Abstract: In recent years it has been discovered that there is a population of low mass galaxies with E/S0 morphologies, but with blue colors more typical of late type galaxies. It has been shown that these blue E/S0 galaxies are most likely post-merger systems rebuilding first gas and then stellar disks. Recent studies have measured metallicity gradients to determine the source of the gas accreting onto galaxies that experienced recent mergers. Two pictures emerge: one in which the gas consists of tidal debris from earlier in the merger falling back into the galaxy, and one in which the source of gas is cosmic accretion from a relatively pristine reservoir. We have prior SOAR spectroscopy of one blue E/S0 that shows evidence for the cosmic accretion model. Here we propose a small survey of 63 blue E/S0 galaxies (a subset of a larger volume-limited survey) to study the source of gas in this subpopulation and track the disk building potential as a function of environment.


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