A deep survey of the Coma cluster: Is there a large population of star- forming dwarfs?

Details A deep survey of the Coma cluster: Is there a large population of star- forming dwarfs? A deep survey of the Coma cluster: Is there a large population of star- forming dwarfs?

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..319o&link_type=abstract

NOAO Proposal ID #2001A-0319

Mathematics

Probability

Scientific paper

We request 2 nights with the 8K Mosaic Camera on the KPNO 4-meter to obtain medium-band imaging of a 2.88sq° strip in the Coma cluster. These filters, for the cluster redshift of z=0.0231, are appropriately tuned to isolate the rest-frame wavelength of key spectral features in star-forming and dwarf spheroidal Coma galaxies. These observations will allow us to efficiently isolate thousands of cluster members relative to the background field galaxy population, a job that would be very expensive using spectroscopic followup. Recent ground- and HST-based studies indicate that star-forming dwarf populations may be a fundamental component in clusters. Such a population is believed to produce a steep upturn in some cluster luminosity functions, however a lack of deep cluster redshift surveys prevents firm confirmation of this dwarf component. We seek to isolate candidate galaxies in Coma which represent the most likely source of the steep faint-end LF reputed to exist by others: star- forming dwarfs with strong emission lines and early-type dwarf spheroidals with 4000 an breaks. There is mounting evidence that such star-bursting components may form structural sub-units in clusters and may be manifestations of the Butcher-Oemler effect seen at high redshift. The large number of high-probability cluster members expected from this medium-band survey will enable us to address these important recent findings concerning cluster populations.

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