Journal Article

Global gravitationally organized spiral waves and the structure of NGC 5247

S. A. Khoperskov, A. V. Khoperskov, I. S. Khrykin, V. I. Korchagin, D. I. Casetti-Dinescu, T. Girard, W. van Altena and D. Maitra

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 3, pages 1983-1993
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2012.22031.x
Global gravitationally organized spiral waves and the structure of NGC 5247

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Abstract

Using observational data, we build numerical N-body, hydrodynamical and combined equilibrium models for the spiral galaxy NGC 5247. The models turn out to be unstable as regards spiral structure formation. We simulate scenarios of spiral structure formation for different sets of equilibrium rotation curves, radial velocity-dispersion profiles and disc thicknesses and demonstrate that in all cases the simulated spiral pattern agrees qualitatively with the observed morphology of NGC 5247. We also demonstrate that an admixture of a gaseous component with a mass of about a few per cent of the total mass of the disc increases the lifetime of a spiral pattern by approximately 30 per cent. The simulated spiral pattern in this case lasts for about 3 Gyr from the beginning of the growth of perturbations.

Keywords: instabilities; ISM: structure; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure

Journal Article.  6587 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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