Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1004b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 1004-1013.
Astronomy and Astrophysics
Astronomy
40
Charge Coupled Devices, Galaxies, Magnitude, Astronomical Catalogs, Brightness Distribution, Luminosity
Scientific paper
Zwicky magnitudes are compared to blue isophotal magnitudes derived from surface photometry of digital galaxy images to study the isophotal nature of the Zwicky magnitude scale at the faint end. The approximate isophote that corresponds to the magnitude tabulated in the Catalog of Groups and Clusters of Galaxies (Zwicky et al. 1961-1968). It is found that, in the mean, the Zwicky magnitude closely corresponds to the blue magnitude measured with the B = 26.0 mag/sq arcsec isophote. The scatter is 0.31 mag and the distribution of isophotal surface brightness is very broad, however, making the Zwicky magnitudes only accurate to about 30 percent when used a luminosity indicator. It is shown that relative differences in Zwicky magnitude do not provide an accurate gage of the true relative luminosities of galaxies.
Bothun Gregory D.
Cornell Mark E.
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