An Extragalactic Database. III. Diameter Reduction.

Show simple item record Buta, Ronald 2019-08-05T20:35:11Z 2019-08-05T20:35:11Z 1991-03 en_US
dc.identifier.citation Paturel, G., et al. (1991): An Extragalactic Database. III. Diameter Reduction. Astronomy and Astrophysics, 243(2). DOI: en_US
dc.description.abstract New photometric diameters have been used to study transformation formulae to reduce all visual diameters to a common standard system (isophotal diameter at the limiting surface brightness of 25 B mag arcsec⁻²). 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 catalogues. Besides, the ESGC catalogue (Corwin and Skiff 1990) which covers the equatorial band, allows, for the first time, to test the North-South homogeneity of the reduction. The coefficients used in the reduction formulae have also been derived using empirical arguments. Both methods are in fair agreement. In addition, a correlation between the coefficients used for diameter and axis ratio also gives a confidence in the formulae. Finally, the standard error associated with each catalogue, has been found to depend upon the diameter, which seems more realistic than the previous approximation of a constant dispersion. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject galaxies en_US
dc.subject data analysis en_US
dc.subject catalogue en_US
dc.subject astronomical catalogs en_US
dc.subject data bases en_US
dc.subject astronomical photometry en_US
dc.subject brightness distribution en_US
dc.subject error analysis en_US
dc.subject visual observation en_US
dc.subject astronomy en_US
dc.subject galaxies: photometry en_US
dc.subject galaxies: diameters en_US
dc.subject galaxies: data bases en_US
dc.subject galaxies: catalogues en_US
dc.title An Extragalactic Database. III. Diameter Reduction. en_US
dc.type text en_US

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