Dynamical Properties of Distant Field Galaxies

Physics

Scientific paper

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Hst Proposal Id #6838 Cosmology

Scientific paper

A sample of several hundred field galaxies to I = 24 {c.f. to I=22 z 0.5 from Lilly et al. 1995} is being observed with the Keck telescope in a major new survey. The distribution of high redshift galaxies bears directly on models for cosmology {via the number-redshift relation} and galaxy evolution. The unique aspect of the new survey is the inclusion of useful line widths from the spectra, providing, for the first time, a sample of high-redshift galaxies with kinematical information. With the addition of an image size scale provided by WFPC2, dynamical parameters can be determined. WFPC2 imaging, the existing faint photometric and spectroscopic database in the Koo-Kron redshift survey fields {Munn et al. 1995}, and new Keck spectroscopy combine to form a powerful new database that will advance our studies of cosmology and galaxy evolution at high redshift. We propose to obtain WFPC2 images {F606W and F814W} in one region of the sky, adjacent to existing deep WFPC2 images. This combined region is designed to match the field-of-view of the Keck multiple-object spectrograph. This strategy enables a factor-of-three higher rate of acquisition of spectra for galaxies with measured HST image parameters. Keck spectroscopy in this field has already been successfully initiated, and further Keck observations will proceed in parallel with the new WFPC2 exposures.

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