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The Corotation Radius and Other Resonances in NGC 7479

Published online by Cambridge University Press:  12 April 2016

J. A. L. Aguerri ,
C. Muñoz-Tuñón ,
A. M. Varela  and
M. Prieto
J. A. L. Aguerri
Affiliation:
Instituto de Astrofisica de Canarias, Tenerife, Spain
C. Muñoz-Tuñón
Affiliation:
Instituto de Astrofisica de Canarias, Tenerife, Spain
A. M. Varela
Affiliation:
Instituto de Astrofisica de Canarias, Tenerife, Spain
M. Prieto
Affiliation:
Department of Astronomy, University of Florida, P. O. Box 112055, Gainesville, FL 32611-2055, USA

Extract

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The luminosity profiles perpendicular to the bar of the galaxy NGC 7479 display “shoulders”, which are observationally identified as an increase in the brightness profile (see Figure 1, right). In the literature (see e.g. Buta 1986), the presence of these features in other barred spirals has been reported. The “shoulders” have been attributed to annular structures resulting from the presence of a bar (Schwarz 1981, 1984, 1985), appearing at the OLR. Their stability and the precise modelling depends on the structural parameters of the bar. We attempt to test the plausibility of this theoretical interpretation using 2D photometry of the barred galaxy NGC 7479. The key parameter is the corotation radius (CR), defined as the galactocentric distance at which the gas and the shock wave corotate. From the CR all other Lindblad resonances can be obtained. Some of the techniques used to derive the CR are:

Type
Posters for Part IX
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 557 - 559
Copyright
Copyright © Astronomical Society of the Pacific 1996

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