The Faint End of the Red Sequence in the Coma Cluster: A Comprehensive Spectroscopic Survey from the Core to the Virial Radius

Details The Faint End of the Red Sequence in the Coma Cluster: A Comprehensive Spectroscopic Survey from the Core to the Virial Radius The Faint End of the Red Sequence in the Coma Cluster: A Comprehensive Spectroscopic Survey from the Core to the Virial Radius

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..539m&link_type=abstract

NOAO Proposal ID #2008A-0539

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Scientific paper

We propose to continue our deep, wide-field spectroscopic survey of the Coma cluster using the MMT with Hectospec. In 2007A, we obtained redshifts for ~4700 faint galaxies in two one-degree fields, one centered on the Coma core and the other in the infall region around NGC 4839. At the same time, we obtained high S/N spectra for 101 brighter dwarfs to measure ages and chemical compositions. Using the high S/N sample, we detect a significant decrease in both the mean population age and the mean galaxy metallicity with cluster-centric distance. In 2008A, we request time to push deeper in the luminosity function in the core and to observe a much larger area of the infall region. Our goals are 1) to measure the luminosity function in the core field to M_r=-14 and, using our HST/ACS imaging, its dependence on galaxy structure, 2) to sample a broader range of structures out to 2.4 Mpc from the cluster center using high-S/N spectral index measurements to understand whether the radial age and abundance gradients represent a cluster-wide trend, 3) to measure the luminosity function to M_r=-15 in the cluster infall region to constrain the effect of environment on the dwarf galaxy population and 4) to map the distribution of dwarf post-starburst galaxies to learn what begins their migration to the red sequence.

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