Statistics – Computation
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..491c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 491-500.
Statistics
Computation
11
Faint Objects, Galactic Structure, Astronomical Photography, Charge Coupled Devices, Computational Astrophysics, Luminosity
Scientific paper
Studies in observational cosmology require absorption-free, K-corrected total magnitudes, e.g. for mass determinations from luminosity. A method for the determination of absorption-free magnitudes for a large number of faint galaxies used in a photographic survey containing data of about 540,000 galaxies with bJ = 22 or less is presented. The uncorrected total magnitudes are determined from aperture photometry. The absorption-free magnitudes are obtained by applying corrections for galactic and internal absorption. For the latter, the morphological type and the apparent ellipticity are used as parameters. Faint galaxies, for which no morphological classification is available, are corrected according to their apparent ellipticity. The correction curve needed for these galaxies is obtained by using the mixture of morphological types for different ellipticity intervals.
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