Statistics – Computation
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430....1s&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 1-12
Statistics
Computation
60
Astronomical Photometry, Galactic Radiation, Hubble Constant, Magnitude, Red Shift, Computational Astrophysics, Cosmology, Hubble Diagram
Scientific paper
Observational selection in flux-limited catalogs of field galaxies can be detected using a diagram in which the calculated intrinsic luminosity of each galaxy is plotted against its redshift. Apparant correlations of absolute magnitude with redshift that are not real, but rather are caused by selection effects can be identified adding a fainter sample. If an apparent correlation is due to bias, it will disappear at the original flux level but will reappear with the same properties near the limit of the fainter catalog. The method is illustrated using SO + Sa galaxies from two catalogs with different apparent magnitude limits. The demonstration is the same as that made earlier using Sc I galaxies. To avoid photometric distance determinations that are systematically incorrect as a function of redshift, it is necessary to use mean absolute magnitudes, M(m,vi) that are functions of the apparent magnitude limit of the catalog, m, and of the observed individual redshifts, vi. This double-entry M0 - M(m,vi) correction to the proper volume-limited absolute magnitude M0 is calculated and is listed in a table. Failure to apply this bias correction at every redshift will give an incorrect Hubble constant that apparently increases outward. The clue that bias corrections are needed is that the apparent Hubble constant calculated using uncorrected data from two catalogs with different flux limits will be double-valued at a given redshift, one value for each catalog, which is a clear contradiction.
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