NOAO >   Observing Info >   Approved Programs >   2014A-0531

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Proposal Information for 2014A-0531


PI: Nathalie Ouellette, Queen's University, nouellette@astro.queensu.ca
Address: Department of Physics, Astronomy Research Group, Kingston, Ontario, K7L 3N6, Canada

CoI: Stephane Courteau, Queen's University
CoI: Jon Holtzman, New Mexico State University
CoI: Thomas Puzia, Pontificia Universidad Catolica de Chile
CoI: Mia Bovill, Pontificia Universidad Catolica de Chile
CoI: Michele Cappellari, Oxford University
CoI: Patrick Cote, Herzberg Institute of Astrophysics
CoI: Julianne Dalcanton, University of Washington
CoI: Aaron Dutton, MPIA
CoI: Paul Eigenthaler, Pontificia Universidad Catolica de Chile
CoI: Eric Emsellem, ESO Garching
CoI: Laura Ferrarese, Herzberg Institute of Astrophysics
CoI: Michael McDonald, Massachusetts Institute of Technology (Astrophysics)
CoI: Roberto Munoz, Pontificia Universidad Catolica de Chile
CoI: Joel Roediger, Queen's University
CoI: Brent Tully, University of Hawaii (IfA)

Title: Populating the Virgo Velocity Function with Early-Type Galaxies at Gemini

Abstract: We propose to sample the circular velocity function (CVF) and stellar-to-halo mass relation (SHMR) of Virgo early-type galaxies (ETGs) in the stellar mass range M* = 10^(7-10) Msol. This proposal is part of a large effort to characterize the dynamical and stellar population properties of a representative sample of Virgo ETGs for which deep near-UV/optical/near-IR imaging exists. The proposed sample will significantly augment the crucial low-mass range below M* < 10^9 Msol, where the sharp LCDM predictions for the CVF and SHMR (abundance matching) are fully unconstrained due to significant incompleteness (0-20%) of current data bases. Numerous tantalizing trends, such as bifurcations and possible bimodalities of mass relations for ETGs and LTGs, may prove transformational for galaxy structure studies and must be confirmed with a study like ours. We seek GMOS absorption spectra of 35 faint ETGs for a total of 100 hours of Canadian, US, and Chilean Gemini time. Our program exploits synergies of the Gemini and VLT observatories and will deliver a benchmark dataset of lasting legacy value, building upon our large Virgo cluster team expertise.


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 >   2014A-0531

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