Mathematics – Logic
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...84...39s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 84, no. 1, p. 39-53.
Mathematics
Logic
11
Astronomical Photometry, Cosmology, Galaxies, Red Shift, Astronomical Spectroscopy, Error Analysis, Least Squares Method, Photographic Plates, Schmidt Telescopes
Scientific paper
Methods for automated galaxy redshift measurements from very low dispersion objective prism Schmidt plates (246 nm/mm at H-gamma) are described. The combination of up to five redshift estimators per galaxy yields z-values for about 10,000 galaxies per field (5.6 x 5.6 deg) at high galactic latitudes. The covered magnitude and redshift ranges are bj 13.0 to 19.5 and z of 0.0 to 0.3, respectively. Mean random errors of the final galaxy redshifts, estimated by comparison with 202 redshifts from slit spectra, are 0.012 for more than 75 percent of the galaxies. The z-errors for different magnitudes, redshifts, and Hubble-equivalent types vary between 0.006 and 0.016. So far, 120,000 usable galaxy redshifts in 300 sq deg are available, which are both necessary and (marginally) sufficient for solving cosmological problems on large scales.
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