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Preliminary Results from a New Survey of Ringed Galaxies

Published online by Cambridge University Press:  25 April 2016

R. Buta
R. Buta*
Affiliation:
Mount Stromlo and Siding Spring Observatories, Australian National University
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Abstract

The SRC-J and ESO-B Sky Survey copy films are being used to compile a major new catalogue of apparent diameters, axis ratios, and relative bar/ring position angles of inner and outer rings in more than one thousand southern galaxies. This paper presents a preliminary analysis of the data for about two hundred SB rings of both types. It is concluded that the rings have a wide range of intrinsic eccentricities, and more importantly that they have preferred alignments, one mode for inner rings and two for outer rings, with respect to bars.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 1 , 1985 , pp. 56 - 60
Copyright
Copyright © Astronomical Society of Australia 1985

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References

* The representation which does give a uniform distribution for the angles of round rings is that where the relative frequencies are plotted for equal intervals of the parameter

For however, the serious selection effects for highly inclined galaxies (which would contribute the bulk of objects having low values of θ) would cause an observed distribution to be skewed towards A = 1. The distributions plotted versus θ are more illustrative as far as preferred alignments are concerned.