NOAO > Observing Info > Approved Programs > 2009A-0432
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NOAO > Observing Info > Approved Programs > 2009A-0432 |
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PI: Ronald Marzke, San Francisco State University, marzke@sfsu.edu
Address: Physics Department, 1600 Holloway Ave., San Francisco, CA 94132, USA
CoI: Ann Hornschemeier, NASA/GSFC
CoI: Russell Smith, University of Durham
CoI: Neal Miller, Johns Hopkins University
CoI: Michael Hudson, University of Waterloo
CoI: Harry Ferguson, STScI
CoI: Terry Bridges, Anglo-Australian Observatory
CoI: John Lucey, University of Durham
CoI: Brent Tully, University of Hawaii
CoI: David Carter, Liverpool John Moores University
CoI: Mustapha Mouhcine, Liverpool John Moores University
CoI: Neil Trentham, Cambridge University
CoI: Nelson Caldwell, Harvard-Smithsonian Center for Astrophysics
Title: The Faint End of the Red Sequence in the Coma Cluster: A Comprehensive Spectroscopic Survey from the Core to the Virial Radius
Abstract:
We request two nights to complete our deep, wide-field spectroscopic
survey of the Coma cluster using the MMT with Hectospec. In 2007A, we
obtained 4788 spectra to measure the luminosity function and the stellar
populations of Coma cluster galaxies. The 2007A observations were
limited to two fields, one in the core and the other roughly a degree to
the southwest in a region dominated by the single group associated with
NGC 4839. Spectral indices of a high-S/N subsample drawn from these two
fields show that the mean age of the low-luminosity galaxies is lower in
the outskirts of the cluster than in the cluster center. We requested
and were awarded four nights in 2008A to determine whether this radial
decline in galaxy ages is a global feature of the Coma infall region and
to place the luminosity function measured in the infall region on the
same statistical footing as the luminosity function measured in the
core. Because of unfavorable scheduling and poor weather, we obtained
less than half of the observations awarded in 2008A. Here we request
time to complete the survey.
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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NOAO > Observing Info > Approved Programs > 2009A-0432 |
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