NOAO >   Observing Info >   Approved Programs >   2011B-0031

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Proposal Information for 2011B-0031


PI: T.B. Williams, Rutgers University, williams@physics.rutgers.edu
Address: Department of Physics and Astronomy, 136 Frelinghuysen Rd., Piscataway, NJ 08854, USA

CoI: Rachel Kuzio de Naray, Royal Military College of Canada
CoI: Kristine Spekkens, Royal Military College of Canada
CoI: Elaine Briere, Queen's University, Royal Military College of Canada
CoI: J.A. Sellwood, Rutgers University

Title: Cold Dark Matter and the Structure of Spiral Galaxies

Abstract: We propose to obtain deep BVRI and H(alpha) imaging of the accessible targets in a large sample of nearby, normal spiral galaxies for which multi-wavelength velocity fields will also be derived. The requested broadband imaging is essential for characterizing the stellar morphology, baryonic mass-to-light ratio and disk geometry in each target, while spectroscopic observations obtained at other facilities probe the total mass distribution therein. Detailed mass models of the resulting photometry and kinematics will quantify the importance of asymmetries and projection effects on the dark matter halo profiles inferred for each system, and self-consistent realizations of the optimal fits will mitigate the degeneracy between the dark and luminous components. Our observational program will thus yield tight constraints on the halo profiles of nearby spirals in a key test of the canonical Cold Dark Matter paradigm on galaxy scales.


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 >   2011B-0031

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