Abstract
Direct CCD images of the field of the quasar 3C275.1 have been obtained using v, r, and redshifted forbidden O II filters to study the ionized gas cloud surrounding the quasar and to determine the gross characteristics of the quasar host galaxy. The images show an elliptical substrate containing several bright knots and indicate that the host galaxy is extremely large and luminous. The host galaxy's luminosity, dimensions, and position at the cluster center suggest that it may be a cD or 'proto-cD'. The nebulosity may be accreting matter from a 'cooling flow' of the intracluster medium. Alternatively, the quasar and the surrounding galaxy and gas cloud may be the result of repeated galaxy collisions.
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