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Date and Time of the Query: 2019-06-15 T17:32:18 PDT
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For refcode 1990ApJ...353...90W:
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...353...90W LUMINOSITY-VELOCITY DIAGRAMS FOR VIRGO CLUSTER SPIRALS. I. INNER ROTATION CURVES DAVID WOODS Department of Geophysics and Astronomy, University of British Columbia BARRY F. MADORE Infrared Processing and Analysis Facility, Division of Mathematics, Physics and Astronomy, California Institute of Technology AND GREGORY G. FAHLMAN Department of Geophysics and Astronomy, University of British Columbia Received 1989 June 28; accepted 1989 October 5 ABSTRACT Optical rotation curves are presented for the innermost portions of nine spiral galaxies in the Virgo Cluster. The emission-line (H{alpha} and [N II]) velocity data are to be used in combination with new CCD photometry to construct luminosity-velocity diagrams, in a continuing investigation of an apparent initial linear branch and its potential as a distance indicator. Compared to recent H I data, our optical rotation curves generally show systematically steeper inner gradients. We ascribe this effect to the poorer resolution of the H I data and/or to "holes" in the gas distribution. Differences between emission-line and absorption-line rotation curves found, by other workers, for the innermost regions of some spirals, containing significant bulge components, are noted and briefly discussed. Subject headings: galaxies: clustering - galaxies: internal motions - galaxies: photometry
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