Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7280p&link_type=abstract
HST Proposal ID #7280
Physics
Hst Proposal Id #7280 Galaxies
Scientific paper
This proposal is to measure the detailed image structure of the two oldest galaxies presently known at high redshift. The 1-mJy radio galaxies 53W091 and 53W069 have ages of 3.5 Gyr at z=1.55 and 4.5 Gyr at z=1.43, based on rest-frame UV stellar absorption features from Keck LRIS spectra. These are the first high-redshift galaxies for which detailed studies of stellar populations have proved possible. The robust conclusion is that these objects must have formed at z>5, and it is important to understand what kind of galaxies they are. We therefore proposed to image 53W091 and 53W069 in three wavebands, allowing us to map their overall morphology in the rest-frame UV and on either side of the 4000-Angstrom break. If these are passively-evolving precursors of present-day ellipticals, then they should have de Vaucouleurs' profiles and characteristic radial colour gradients. Measuring these parameters would place the galaxies on the fundamental plane and thus measure their masses and metallicities, tying down more precisely their stellar ages. Given an allocation reduced to 9 orbits, we propose now to concentrate on the longer-wavelength imaging.
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