A Tunable Lyot Filter at Prime Focus: a Method for Tracing Supercluster Scales at z ～1

摘要

Tunable narrowband emission line surveys have begun to show the ease with which star-forming gal- axies can be identified in restricted redshift intervals to z ～5 with a 4 m class telescope. These surveys have been carried out with imaging systems at the Cassegrain or Nasmyth focus, and are therefore restricted to fields smaller than 10'. We now show that tunable narrowband imaging is possible over a 30 field with a high-performance Lyot filter placed directly in front of a CCD mosaic at the prime focus.