NOAO >   Observing Info >   Approved Programs >   2009A-0297

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Proposal Information for 2009A-0297


PI: Mark A. Norris, UNC - Chapel Hill, manorris@physics.unc.edu
Address: Department of Physics and Astronomy, CB 3255, Phillips Hall, Chapel Hill, North Carolina 27599-3255, USA

CoI: Sheila Kannappan, UNC - Chapel Hill

Title: Unified Analysis of Spheroid and Disk Dynamics in S0s

Abstract: Spiral and elliptical galaxies obey fundamental scaling relations between their kinematic and structural properties, which are used to place strong constraints on the formation histories of these galaxy types. S0 galaxies however do not fit cleanly in any of the scaling relations and even their masses are not well defined. This is due to the fact that S0s combine both rotation V and dispersion \sigma supported components, which are difficult to unify into a single dynamical mass estimator sensitive to variations in V/\sigma and bulge- to-disk ratio. We therefore propose deep spectroscopy of a diverse sample of 24 S0s, allowing the simultaneous measurement of dynamically cold rotation from gas emission lines (found in >80% of S0 galaxies) and dispersion and rotation from the absorption lines of spheroids and thick stellar disks. The ability to simultaneously study the dynamics of stellar disks, bulges and gas disks for a broad sample of S0s will enable both the accurate determination of S0 masses and the correct placement of S0s in a range of galaxy scaling relations for the first time.


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



NOAO >   Observing Info >   Approved Programs >   2009A-0297

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