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A. Uomoto (JHU), S. Smee (U Md), C. Rockosi (U Chicago), S. Burles (U Chicago), A. Pope (JHU), S. Friedman (JHU), J. Brinkmann (Apache Point), J. Gunn (Princeton), R. Nichol (Carnegie Mellon), SDSS Collaboration
Redshifts of one million galaxies selected from SDSS imaging data will be used to map the large scale structure of the nearby universe.
Spectra will be observed with two dual-channel fiber optic spectrographs on the SDSS 2.5 m telescope. Each spectrograph accepts 320 f/4 beams from fibers positioned on an aluminum plate at the telescope focal plane. Light from the fibers is presented to a spherically figured collimator mirror, then split at 6000 Å\ by a dichroic beamsplitter and presented to two large grisms. After dispersion by the grisms, two 8-element cameras image the spectra onto two 2048x2048 CCD detectors.
This system records 640 spectra with a uninterrupted wavelength coverage from about 3900 to 9100 Å\ at a resolving power of about R=1800.