Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5919b&link_type=abstract
HST Proposal ID #5919
Physics
Hst Proposal Id #5919 Galaxies &Amp, Clusters
Scientific paper
It is proposed to image in two properly spaced UV passbands (rest frame wavelength 1500 Angstrom and 2000 Angstrom) the very rich galaxy cluster CL0939+4713 = Abell 851 at a redshift of z=0.41. Such a cluster, which represents a lookback time of 4--5 billion yr in conventional cosmologies, contains a large population of galaxies with strong ongoing star formation. Moreover, already existing HST images corresponding to a rest frame color between Johnson B and V, reveal an abundance of late--type galaxies as well as many merging or interacting systems. The new UV observations proposed here are primarily intended to test the current ideas on the age and metal abundance of distant systems. In particular we plan to measure at z=0.4 the level of the well--known UV turn--up observed in present--day ellipticals and spiral bulges. The level of this turn--up is expected to decrease with lookback time. Its precise determination at a given z will allow us to put strict constraints on the evolutionary history of these galaxies. As a by--product it is expected to derive essential clues on the nature of a cluster of faint objects surrounding a quasar at z=2.055 contained in the field. Since the proposed observations will sample a wavelength below the Lyman limit for z=2 and z=1.2 respectively, it is expected to see a strong drop in flux for these objects depending on their redshift, thus possibly confirming their association with the quasar itself.
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