NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-22 T12:49:59 PDT
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For refcode 1995ApJ...442...82C:
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Copyright by American Astronomical Society. Reproduced by permission
1995ApJ...442...82C A TECHNIQUE FOR DETERMINING THE EXTRAGALACTIC DISTANCE SCALE MASASHI CHIBA Astronomical Institute, Tohoku University, Sendai 980-77, Japan AND YUZURU YOSHII Institute of Astronomy, University of Tokyo, Mitaka Tokyo 181, Japan Received 1994 June 8; accepted 1994 September 29 ABSTRACT We propose a method of distance determination based on the internal structure and dynamics of disk galaxies. The method relies on the universal luminosity profile of a stellar disk represented by an exponential law. Calibrating nearby galaxies with known distances, it is found that the scale length of the disk is tightly correlated with the specific combination of central surface brightness and rotational velocity at a characteristic radius of 2.15 scale lengths from the center. This suggests that the scale length of the disk may be used as an indicator for extragalactic distance scale. The application of this relation to M51 and M100 allows us to arrive at the distances of about 6 and 14 Mpc, respectively, implying a Hubble constant of H_0_ = 92-94 km s^-1^ Mpc^-1^. Subject headings: distance scale - galaxies: kinematics and dynamics - galaxies: photometry - galaxies: spiral - galaxies: structure
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