Distances to the Virgo and Ursa Major clusters and a determination of H0

Details Distances to the Virgo and Ursa Major clusters and a determination of H0 Distances to the Virgo and Ursa Major clusters and a determination of H0

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..579p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 579-581, 583-595. Research supported by ARCS Foundat

Astronomy and Astrophysics

Astronomy

306

Astrometry, Galactic Clusters, Hubble Constant, Virgo Galactic Cluster, Astronomical Photometry, Calibrating, Centimeter Waves, Distance, Luminosity, Magnitude, Radio Astronomy, Spectral Line Width, Spiral Galaxies

Scientific paper

A detailed study of the Tully-Fisher (TF) relations and their promise as a distance indicator is presented. The TF relations are compared in such different environments as the Virgo Cluster core and the Ursa Major Cluster, with no significant differences found. The question as to whether there is a morphological-type dependence to the TF relations is addressed, and it is concluded that the intrinsic dispersion of the TF relations is quite small and that the TF relations can provide distances with very high precision throughout a large range of galaxy environments. Evidence is found for substructure in the Virgo Cluster, and the variation in the slope of the TF relations with wavelength is addressed. An absolute calibration obtained from M31, M33, and NGC 2403 establishes the distance to the Ursa Major and Virgo Clusters to be 15.5 + or - 1.2 Mpc and 15.6 + or - 1.5 Mpc, respectively. Assuming a Virgocentric flow of 300 km/s at the Local Group, the Hubble Constant is determined to be H0 = 85 + or - 10 km/s/Mpc.

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