Very large spiral galaxies

Mathematics – Logic

Scientific paper

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Astronomical Catalogs, Cosmology, Galactic Evolution, Spiral Galaxies, Diameters, Electrophotometers, Luminosity, Ubv Spectra

Scientific paper

As a first step in the systematic study of large spirals, which may be useful in cosmological tests and studies of galaxy evolution, a catalog of the 107 largest known spiral galaxies is presented. Catalog galaxies have isophotal diameters greater than 90 kpc, assuming an H(zero) value of 50 km/sec per Mpc. UBVR photoelectric photometry is presented for 20 of these galaxies, and absolute magnitudes are derived for all galaxies in the catalog by transforming Zwicky magnitudes to the B(T) system.

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