Direct measurements of cluster expansion for nearby galaxy clusters

Details Direct measurements of cluster expansion for nearby galaxy clusters Direct measurements of cluster expansion for nearby galaxy clusters

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109l...5k&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. L5-L7.

Astronomy and Astrophysics

Astrophysics

1

Astrometry, Galactic Clusters, Galactic Evolution, Red Shift, Spiral Galaxies, Cosmology, Data Correlation, Dimensional Measurement, Expansion, H Lines, Hubble Constant, Hydrogen Atoms, Spectral Line Width

Scientific paper

Using the Tully-Fisher relation between the total luminosity and the H I line width of spiral galaxies as a distance indicator, a correlation between distances and redshifts of the different galaxies in nearby clusters is found. This correlation can be explained by an expansion rate of the cluster's outermost regions which is positive but less than Hubble's constant, as derived from the Tully-Fisher relation. Some dynamical implications are discussed.

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