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Date and Time of the Query: 2019-05-26 T12:07:29 PDT
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For refcode 1989ApJ...342..122K:
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Copyright by American Astronomical Society. Reproduced by permission
1989ApJ...342..122K ON THE INTERRELATION BETWEEN THE SURFACE PHOTOMETRIC PARAMETERS AND THE INTERNAL VELOCITIES OF GALAXIES KEIICHI KODAIRA National Astronomical Observatory, Mitaka, Tokyo, Japan Received 1988 July 22; accepted 1988 December 12 ABSTRACT The interrelations between the surface photometric parameters (luminosity, diameter, surface brightness, concentration index) and the internal velocities (velocity dispersion, rotational velocity) are explored by means of the principal component analysis and the regression line analysis of homogeneous data for 18 elliptical and 28 spiral galaxies of moderate inclinations (30^deg^ <~ i <~ 65^deg^) in the Virgo Cluster. We find extremely tight correlations (|correlation coefficients| > 0.98), both for ellipticals and spirals, between the visual magnitude V_26_ and a combined parameter log w' = log v D_26_ with v and D_26_ being the internal velocity and the isophotal diameter of galaxies. We infer the physical meaning of w = (Gw')^-1^ to be a sort of phase-space density related to the basic structure of galaxies, and briefly describe its empirical behavior in the diameter versus surface brightness diagram. Subject headings: galaxies: internal motions - galaxies: photometry
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