An extragalactic database. III - Diameter reduction

Details An extragalactic database. III - Diameter reduction An extragalactic database. III - Diameter reduction

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..319p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 319-327.

Astronomy and Astrophysics

Astrophysics

38

Astronomical Catalogs, Data Bases, Galaxies, Astronomical Photometry, Brightness Distribution, Error Analysis, Visual Observation

Scientific paper

New photometric diameters have been used to study transformation formulas to reduce all visual diameters to a common standard system (isophotal diameter at the limiting surface brightness of 25 B mag/sq arcsec). A new interpretation of these transformations gives a good explanation of puzzling results found in earlier papers. The curvatures in a log-log plot are explained by the incompleteness of catalogs. Besides, the ESGC catalog, 1990) which covers the equatorial band, makes it possible to test the north-south homogeneity of the reduction. The coefficients used in the reduction formulas have also been derived using empirical arguments. Both methods are in fair agreement.

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