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A Direct Detection of Gas Accretion: The Lyman Limit System in 3C 232

Danforth, Charles W.; Stocke, John T.; Keeney, Brian A.

The gas added to and removed from galaxies over cosmic time greatly affects their stellar populations and star formation rates. QSO absorption line studies in close QSO/galaxy pairs create a unique opportunity to study the physical conditions and kinematics of this gas. Here we present new Hubble Space Telescope (HST) images of the QSO/galaxy pair…

Spatially Resolved Spectroscopy of Starburst and Post-Starburst Galaxies in the Rich z~0.55 Cluster CL 0016+16 ¹

Kuntschner, Harald; Couch, Warrick J.; Pracy, Michael B.

We have used the Low Resolution Imaging Spectrograph on the W. M. Keck I telescope to obtain spatially resolved spectroscopy of a small sample of six `post-starburst' and three `dusty-starburst' galaxies in the rich cluster CL 0016+16 at z=0.55. We use this to measure radial profiles of the Hδ and [OII]λ3727 lines which are diagnostic probes of th…