NOAO >   Observing Info >   Approved Programs >   2003A-0050

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Proposal Information for 2003A-0050


PI: Bahram Mobasher, Space Telescope Science Institute, mobasher@stsci.edu
Address: 3700 San Martin Drive, Baltimore, MD 21218, U.S.A

CoI: Patricia Knezek, WIYN
CoI: Dave Carter, Liverpool John Moores University

Title: Fundamental Plane of Dwarf Galaxies in the Coma Cluster

Abstract: We propose to carry out high resolution (~ 1 \AA) spectroscopy of dwarf galaxies in the core and outskirts of the Coma cluster. The aim is to measure the velocity dispersions and hence internal dynamics, of a large and complete sample of dwarfs. The sample is selected from our wide-field photometric and spectroscopic survey of the Coma cluster, which used the Japanese Mosaic CCD (consisting of 5\times 8 CCDs) and WYFFOS/AUTOFIB-2 on the WHT. Redshifts and diagnostic spectral features have been measured for the complete sample with 172 dwarfs identified as cluster members. The galaxies are located at both the core and outskirts of the Coma cluster. The velocity dispersions determined from the proposed observations here, combined with the available photometric (V and R-band) and spectroscopic (H(gamma), H_(beta), H(delta), Mg_2, C4668, <Fe>) parameters, will be used to carry out a comprehensive study of the formation and evolution of dwarfs in different environments and their relation to the luminous, giant elliptical population. Using the available spectral line indices, diagnostic of star formation, age and metallicity, the effect of these parameters on the Fundamental Plane (the relation between velocity dispersion, effective radius and effective surface brightness) of dwarfs will be studied. The present sample provides one of the largest and most complete photometric and spectroscopic surveys of cluster dwarfs currently available.


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