The Design and Fabrication of a Focal Reducer and its Use to Observe Edge-On Galaxies NGC 4244 and NGC 5907

Details The Design and Fabrication of a Focal Reducer and its Use to Observe Edge-On Galaxies NGC 4244 and NGC 5907 The Design and Fabrication of a Focal Reducer and its Use to Observe Edge-On Galaxies NGC 4244 and NGC 5907

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.2404m&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #24.04; Bulletin of the American Astronomical Society, Vol. 27, p.1321

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Scientific paper

We designed and built a unique focal reducer for the Steward Observatory 2.3 m telescope on Kitt Peak. It decreased the focal ratio from f/9 to f/1.9, thus increasing the field of view on a 2048 x 2048 CCD from 5.1' x 5.1' to 23.9' x 23.9'. The inverted-Cassegrainian, two-mirror design permits high efficiency of UV wavelengths and good broad band image quality from 3500 Angstroms to 8500 Angstroms without chromatic aberrations. Other features include a coronagraph and a filter slide in the slow f/9 beam which permits narrow band imaging. Observations show that image quality up to 3' field radii is seeing-limited. Image quality up to 8' field radii is degraded by about 0.2" or 0.3" FWHM. Very narrow bandpass interference filters of 15 Angstroms FWHM for Hα and 30 Angstroms FWHM for [S II] were tilted to accommodate various red shifts up to 1500 km/s. Models estimating changes in filter CWL and FWHM due to tilt in a converging beam are presented. Deep, continuum-subtracted Hα and [S II] images of the edge-on galaxies NGC 4244 and NGC 5907 are presented. The images show H II regions and the WIM phase of the ISM to be confined to the plane of the disk for both galaxies. Interesting filamentary structure is evident.

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