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Total Magnitudes of Virgo Galaxies. II. An Investigation into the mp Scale of Volume I of Zwicky et al.'s Catalogue of Galaxies and of Clusters of Galaxies

Published online by Cambridge University Press:  05 March 2013

Christopher Ke-shih Young  and
Zheng-yi Shao
Christopher Ke-shih Young
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Xuhui District, Shanghai 200030, China; [email protected] National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China Department of Astrophysics and Optics, School of Physics, University of New SouthWales, Sydney 2052, Australia; [email protected]
Zheng-yi Shao
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Xuhui District, Shanghai 200030, China; [email protected] National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, Great Britain; [email protected]
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Abstract

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We investigate the photographic-magnitude (mp) scale of Volume I of the Catalogue of Galaxies and of Clusters of Galaxies for galaxies in the Virgo direction. It is found that for 11.5 ≤ Bt < 14.5, the mp values listed correspond very closely (with a scatter of only 0.16 magnitude) to blue magnitudes measured to the B = 24.4 isophote. If mp values need to be used as estimates of total blue magnitude the scatter is 0.27 magnitude over the same range in Bt and the mean offset is mp – Bt = 0.28 magnitude. However, a serious scale error at the bright end causes both the isophotal and total luminosities of galaxies brighter than Bt ~ 11.5 to be severely underestimated. At the faint end there also appears to be a significant scale error. This causes galaxy luminosities to be seriously overestimated faintward of Bt ~ 14.5.We demonstrate that this is a real effect based on a detailed galaxy-by-galaxy study of the catalogue’s completeness down to Bt = 17.0. The catalogue is found only to be complete to Bt ~ 14.7 whilst its degree of incompleteness is found to be relatively constant at the 30% level over the range 14.75 ≤ Bt < 15.75. Most of the missing objects are found to be elliptical galaxies and so late-type objects are over-represented at the faint end.

Keywords

cataloguesgalaxies: clusters:individual (Virgo)galaxies: fundamental parametersgalaxies:photometry
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 2 , 2001 , pp. 129 - 135
Copyright
Copyright © Astronomical Society of Australia 2001

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