Is the Velocity-Distance Relation for Galaxies Linear?

Details Is the Velocity-Distance Relation for Galaxies Linear? Is the Velocity-Distance Relation for Galaxies Linear?

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pnas...90.4793v&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 90, Issue 11, pp. 4793-4797

Physics

2

Scientific paper

Diameters of ScI galaxies, the luminosities of supernovae of type Ia at maximum light, and the brightness of central galaxies in rich clusters are examined as potential yardsticks or standard candles for study of the velocity-distance relationship. Both supergiant ScI galaxies and supernovae Ia (which have luminosities that differ by up to a factor of ≈10) are found to be unsuitable for such a study. The remarkably small luminosity dispersion of first-ranked cluster galaxies (which is not yet understood physically) suggests that deviations from a linear velocity-distance relationship are lesssim20% out to red shifts of ≈40,000 km\cdots-1.

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