Mathematics – Logic
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297...23d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 23-26.
Mathematics
Logic
16
Astrometry, Distance, Galactic Clusters, Hubble Constant, Spiral Galaxies, Supernovae, Interstellar Extinction, Red Shift, Stellar Luminosity
Scientific paper
The distance modulus of the Hercules supercluster of galaxies is determined anew by two independent methods: (1) the maximum apparent luminosities of presumed Type I supernovae, >mpg< = 17.0, give a mean corrected modulus μ0 = 35.22±0.28; and (2) the mean apparent magnitudes and diameters of seven Sbc spirals of luminosity classes I to II, corrected for extinction, give a mean corrected modulus μ0 = 35.27±0.15. This leads to a value of the Hubble ratio, >H*< = 99±7 km s-1Mpc-1, which should be free of both Malmquist bias and the effect of local perturbations. The corresponding value of the Hubble constant, H0, depends slightly on cosmological model and corrections.
Corwin Harold G. Jr.
de Vaucouleurs Gerard
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