NOAO >   Observing Info >   Approved Programs >   2002A-0359

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Proposal Information for 2002A-0359


PI: Kathleen Flint, UCO/Lick Observatory, flint@ucolick.org
Address: UCSC, Santa Cruz, CA 95064, USA

CoI: Mike Bolte, UCO/Lick Observatory
CoI: Claudia Oliveira, Instituto Astronomico e Geofisico, USP

Title: The Galaxy Luminosity Function in Nearby Groups

Abstract: The z=0 galaxy luminosity function is not well determined for M_R > -11 outside the Local Group. We have a program underway to measure the luminosity function in nearby groups, where we can probe the faint-end of the distribution to dwarf spheroidal magnitudes and surface brightnesses. We have over seven square degrees of R-band imaging with KPNO 0.9m+MOSAIC in the Leo I group, which have provided group membership candidates down to (mu)_R(0) ~ 24, R_T ~ 20. From a preliminary sample of follow-up spectra of likely members in Leo I, we find a surprisingly high fraction (76%) of background contamination, making it critical that we obtain redshift and distance information for all candidates. We propose to confirm membership of the higher-surface- brightness Leo I candidates (~50/sq. degree with (mu)_R(0) \lesssim 22) with spectroscopic redshifts from WIYN+HYDRAB, where the multi-object capability and one-square-degree field is perfectly matched to our one-square-degree MOSAIC fields. For the remaining lower-surface- brightness objects, we have a parallel project underway to use surface brightness fluctuations to confirm membership.


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 >   2002A-0359

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