Metric characteristics of nuclear rings and related features in spiral galaxies

Details Metric characteristics of nuclear rings and related features in spiral galaxies Metric characteristics of nuclear rings and related features in spiral galaxies

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1344b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 4, p. 1344-1357.

Mathematics

Logic

161

Barred Galaxies, Galactic Nuclei, Galactic Structure, Ring Structures, Spiral Galaxies, Cosmic Dust, Galactic Rotation, Size Distribution

Scientific paper

The metric properties of nuclear rings, pseudorings, spirals, and bars are discussed in the context of resonance theory and are used to gauge the range of sizes for such features. The nuclear rings and pseudorings of strongly barred SB and SAB galaxies have a wide range in linear diameter; the mean diameter is about 1.1 kpc for a sample of 20 objects. We suggest that there are clear analogs of the nuclear rings of strongly barred spirals in both weakly barred (SAB) and nonbarred (SA) spirals. The size ratios of nuclear rings with respect to outer rings and pseudorings, as well as morphological characteristics, are best explained if outer rings and pseudorings are linked to the outer Lindblad resonance, and nuclear rings, pseudorings, and spirals are linked to the inner Lindblad resonance. Nuclear bars are often associated with nuclear rings and spirals, but also can exist independently of such features. We present a list of 13 double-barred galaxies and discuss the significance of the phase angle of the nuclear bar with respect to the primary bar.

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