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Date and Time of the Query: 2019-04-18 T15:50:37 PDT
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For refcode 1993AJ....105...97S:
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Copyright by American Astronomical Society. Reproduced by permission
1993AJ....105...97S MEASURING GALAXY DISTANCES FROM OPTICAL ROTATION CURVES R. A. SCHOMMER Cerro Tololo InterAmerican Observatory, NOAO P.O. Box 26732, Tucson, Arizona 85726 G. D. BOTHUN Department of Physics, University of Oregon, Eugene, Oregon 97403 T. B WILLIAMS Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 J. R. MOULD Palomar Observatory, California Institute of Technology, Pasadena, California 91125 Received 16 April 1992; revised 13 July 1992 ABSTRACT We describe a distance indicator for spiral galaxies using detailed rotation curves derived from H{alpha} velocity fields and I band CCD photometry. Two-dimensional velocity fields are obtained with an imaging Fabry-Perot spectrometer with a velocity accuracy of better than 10 km/s. Rotation curves, based upon rotating disks geometries, are fit to these velocity fields. We present the I band photometry profiles, and the individual rotation curves for 75 galaxies. The extracted circular velocity is combined with I band magnitudes to form a Tully-Fisher relation, with a scatter of ~0.25^m^-0.3^m^ mag. We discuss in some detail the accuracy of our photometric measures, the merits of the detailed rotation curve solutions and the resultant effects on the scatter in the Tully-Fisher relation. As an example, we use the data to derive the relative distance modulus between the Hydra and Antlia clusters which yields a peculiar motion for Antlia of 900+/-100 km s^-1^. This confirms previous detections of large peculiar motions in the Hydra-Centaurus region.
Retrieve 85 NED objects in this reference.
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