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Date and Time of the Query: 2019-06-26 T14:05:35 PDT
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For refcode 1993ApJ...404..419S:
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1993ApJ...404..419S H_0_ FOUND BY COMPARING LINEAR DIAMETERS OF M31 WITH SIMILAR FIELD GALAXIES ALLAN SANDAGE The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 Received 1992 July 31; accepted 1992 August 26 ABSTRACT The method of finding a stringent upper limit to H by comparing the known linear size of M 101 with similar field galaxies and requiring that M 101 not be the largest in a distance-limited sample is extended here to Sab and Sb galaxies using M 31 as the calibrator. In agreement with the earlier result using M 101, the upper limit using M 31 is H < 85 km s^-1^ Mpc^-1^. Because M 31 is the nearest Sb spiral, the most probable actual value of H is found by equating the known linear diameter of M 31 with the mean of a distance-limited sample of similar galaxies. Data on 60 RSA galaxies that are similar to M31 give the most probable value as H = 45 +/- 12 km s^-1^ Mpc^-1^ by this method. Subject headings: cosmology: observations - distance scale - galaxies: fundamental parameters - galaxies: individual (M31) - galaxies: spiral
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