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Title:
Extragalactic distance scale, Malmquist bias and Hubble constant
Authors:
de Vaucouleurs, G.
Publication:
Royal Astronomical Society, Monthly Notices, vol. 202, Jan. 1983, p. 367-378. (MNRAS Homepage)
Publication Date:
01/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DISTANCE, HUBBLE CONSTANT, MAGNITUDE, RED SHIFT, SPIRAL GALAXIES, LUMINOSITY, SUPERNOVAE, TRUNCATION ERRORS
Bibliographic Code:
1983MNRAS.202..367D

Abstract

An argument is made that the strong Malmquist bias claimed to exist in the extragalactic distance scale derived by the author is nonexistent. A distinction is made between Malmquist effect in galactic samples and a Malmquist bias in derived distances; the former does not lead to the latter as long as the distance indicator has a small dispersion and is free of distance-dependent systematic errors. The Malmquist bias in the V distance scale is much smaller than the Malmquist effect in the V sample. The residual bias is minimized by the use of a nonlinear calibration relation and by an appropriate selection rule. The claim of bias also depends on an irrelevant application of the Schechter general luminosity function, the unwarranted assumption that the velocity-distance relation is linear and isotropic at small redshifts, and the use of a graphical presentation where the two coordinates are correlated.

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