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Date and Time of the Query: 2019-05-23 T15:02:26 PDT
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For refcode 2000ApJ...534..670T:
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Copyright by American Astronomical Society. Reproduced by permission
2000ApJ...534..670T Radial Distribution of the Mass-to-Luminosity Ratio in Spiral Galaxies and Massive Dark Cores Tsutomu Takamiya and Yoshiaki Sofue Institute of Astronomy, University of Tokyo, Mitaka, Tokyo 181-8588, Japan Received 1999 May 19; accepted 1999 November 24 ABSTRACT We derive radial profiles of the surface mass density for 19 spiral galaxies directly from their high-resolution rotation curves. Using the corresponding luminosity profiles, we obtain the radial distribution of the mass-to-luminosity ratios (M/Ls) from the inner bulge (around a few hundred parsecs) to the outer disk (>= 2-10 kpc) for 11 galaxies (with inclination <70^deg^ in order to reduce the influence of the interstellar extinction). The M/Ls in the bulges of two galaxies with sufficient resolution, NGC 4527 and NGC 6946, are found to increase steeply toward the center at radii ~100-500 pc at rates of 15 +/- 3 and 7 +/- 2 times per kpc, respectively. Some other galaxies with fairly high resolution also show signs of an increase toward the center. Such an increase may indicate the existence of a new component, a "massive dark core," which may be an object linking the bulge and a central black hole. Based on radial variations of the M/Ls, we further discuss the variation of the dark mass fraction in spiral galaxies. Subject headings: galaxies: kinematics and dynamics-galaxies: photometry- galaxies: spiral-galaxies: structure
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