The third image, the redshift of the lens, and new components of the gravitational lens 2016 + 112

Abstract

Three new observations of the gravitational lens system 2016 + 112 are reported. A new, more sensitive spectrograph has produced a redshift for the red galaxy D, and direct imaging through a narrowband filter centered on the Lyman alpha line of the lensed object has detected a previously unknown point source and two radio-quiet extended emission line regions, all apparently at the redshift of the two brighter images A and B. Some preliminary results from a new VLA map of the system are reported, and the implications of the results for models of gravitational lenses are discussed.