Imaging of CL1358+62 and its Environs: the Morphology-Density Relation at Z = 0.33

Details Imaging of CL1358+62 and its Environs: the Morphology-Density Relation at Z = 0.33 Imaging of CL1358+62 and its Environs: the Morphology-Density Relation at Z = 0.33

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5989f&link_type=abstract

HST Proposal ID #5989

Physics

Hst Proposal Id #5989 Galaxies &Amp, Clusters

Scientific paper

The galaxy morphology-density relation provides an importantconstraint on galaxy formation and evolution. The physicalprocesses responsible for defining galaxy types in a givenenvironment, and for their subsequent evolution, remainunclear. To clarify the nature of these processes, we proposean imaging survey of the rich, X-ray selected clusterCL1358+62 at z=0.33. This is one of the best studied clustersat intermediate redshift; we have obtained more than 200spectra of galaxies in CL1358+62 over an area of 10'*10'. WithHST images we can derive the morphologies and bulge-to-diskratios of the member galaxies as a function of radius in thecluster. With these images and our extensive database ofspectra we will be able to relate the star formation historyand morphology of cluster members over a range of galaxydensities. This will be the first detailed study of distantgalaxies in regions intermediate between the high densitycluster centers and the low density field. This cluster isalso the subject of a Keck telescope spectroscopic study ofthe internal kinematical properties of the early-typegalaxies. A key component of this part of the project is thedevelopment of the Fundamental Plane relations for CL1358+62.HST data are essential for this.Since this cluster lies in the Continuous Viewing Zone, a very highobservational efficiency (88%) can be achieved.

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