Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..188o&link_type=abstract
NOAO Proposal ID #1999A-0188
Computer Science
Scientific paper
We propose to obtain Hydra spectroscopy of the fourth of four clusters (CL1446+26) in our small survey of the radio properties of rich clusters with z=0.4. We have deep radio observations of each of these clusters with the VLA at 20cm which allow us to identify radio galaxies at the cluster redshift at luminosities dominated by star formation activity. This cluster is the least evolved and has the highest blue fraction of any we have yet observed and thus explores one extreme of parameter space. The emphasis of the program is to obtain the redshifts and spectral properties of the radio galaxies in order to determine cluster membership, to measure the spatial distribution of the radio galaxies and to divide them into starformation and AGN-driven radio populations. In addition, we want to determine the dynamical state of the cluster to understand what stage we are observing in the cluster evolution and how, if at all, this correlates with the radio galaxy properties. Finally, we want to compare the [OII]/H(alpha) star-formation-rates with radio estimates to look for evidence of changes in the dust obscuration compared with the local calibration. The goal of the program is to understand how the radio population in clusters evolves with redshift and how this is related to the formation of galaxies and large-scale structure.
Ledlow Michael
Owen Frazer
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