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Title:
A new method of determining distances to galaxies
Authors:
Tully, R. B.; Fisher, J. R.
Affiliation:
AA(Marseille, Observatoire, Marseille, France), AB(National Radio Astronomy Observatory, Green Bank, W. Va.)
Publication:
Astronomy and Astrophysics, vol. 54, no. 3, Feb. 1977, p. 661-673. (A&A Homepage)
Publication Date:
02/1977
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
DISTANCE MEASURING EQUIPMENT, H LINES, LUMINOUS INTENSITY, SPECTRAL LINE WIDTH, SPIRAL GALAXIES, TELESCOPES, ASTRONOMICAL PHOTOMETRY, CALIBRATING, GALACTIC CLUSTERS, GALACTIC STRUCTURE, HUBBLE DIAGRAM, SYNOPTIC MEASUREMENT
Comment:
A&AA ID. AAA019.158.045
Bibliographic Code:
1977A&A....54..661T

Abstract

It is proposed that for spiral galaxies there is a good correlation between the global neutral hydrogen line profile width, a distance-independent observable, and the absolute magnitude (or diameter). Such a relation is first sought in nearby calibration galaxies of the Local Group, the M 81 group, and the M 101 group, with well-determined distances, accurately known photometric properties, and accurately known global hydrogen profile width. On the basis of these calibration magnitude-global profile width and diameter-global profile width relationships, distances were derived for the Virgo cluster and the Ursa Major cluster. The distance moduli obtained are 30.6 m for the Virgo cluster and 30.5 m for the Ursa Major cluster. The result for the Virgo cluster suggests a Hubble constant of 80 km per sec per Mpc.

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