Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope
  The scanning Fabry-Perot interferometer (FPI) - is the oldest method of
optical 3D spectroscopy. It is still in use because of the high spectral
resolution it provides over a large field of view. The history of the
application of this method for the study of extended ob jects (nebulae and
galaxies) and the technique of data reduction and analysis are discussed. The
paper focuses on the performing observations with the scanning FPI on the 6-m
telescope of the Special Astrophysical Observatory of the Russian Academy of
Sciences (SAO RAS). The instrument is currently used as a part of the SCORPIO-2
multimode focal reducer. The results of studies of various galactic and
extragalactic objects with the scanning FPI on the 6-m telescope - star-forming
regions and young stellar objects, spiral, ring, dwarf and interacting
galaxies, ionization cones of active galactic nuclei, galactic winds, etc. are
briefly discussed. Further prospects for research with the scanning FPI of the
SAO RAS are discussed.
