Systematic bias in cluster galaxy data, affecting galaxy distances and evolutionary history

Details Systematic bias in cluster galaxy data, affecting galaxy distances and evolutionary history Systematic bias in cluster galaxy data, affecting galaxy distances and evolutionary history

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382....1g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 1-18.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Photometry, Distance, Galactic Clusters, Galactic Evolution, Brightness Distribution, Error Analysis, Luminosity, Mass To Light Ratios, Red Shift

Scientific paper

In order to estimate relative galaxian distances in an unbiased way, aside from the Malmquist effect, a new distance estimator, the reduced galaxian radius parameter, rg, is introduced. With this estimator, relative distances valid to +/-31 percent for individual galaxies can be obtained. If the Coma cluster has no peculiar velocity, then the peculiar velocity of the Virgo cluster, as determined from rg, is 392 km/s, yielding a Virgocentric motion of only -47 km/s. Three-parameter data are used to determine the dependence of solar mass/solar luminosity on solar luminosity. There is little, if any, change of this ratio from the least luminous to the most luminous cluster galaxies. This, together with an estimated ratio of 14, suggests that dark matter in clusters of galaxies does not concentrate near individual galaxies. Because surface brightness parameter is a function of absolute magnitude, an improved surface brightness test for luminosity evolution is suggested.

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