Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..419s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 419-424.
Astronomy and Astrophysics
Astrophysics
23
Diameters, Hubble Constant, Spiral Galaxies, Cosmology, Magnitude, Red Shift
Scientific paper
The method of finding a stringent upper limit to H by comparing the known linear size of M101 with similar field galaxies and requiring that M101 not be the largest in a distance-limited sample is extended here to Sab and Sb galaxies using M31 as the calibrator. In agreement with the earlier result using M101, the upper limit using M31 is H less than 85 km/s/Mpc. Because M31 is the nearest Sb spiral, the most probable actual value of H is found by equating the known linear diameter of M31 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/Mpc by this method.
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