Journal Article

Pattern speed of the stellar bar in NGC 7479

S. Laine, I. Shlosman and C. H. Heller

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 4, pages 1052-1059
Published in print July 1998 | ISSN: 0035-8711
Published online July 1998 | e-ISSN: 1365-2966 | DOI:
Pattern speed of the stellar bar in NGC 7479

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We study the pattern speed of the bar in NGC 7479 by comparing observations with numerical simulations of gas flow in a two-dimensional gravitational potential, derived from observations. The best agreement between the observations and the modelling is achieved for the fast bar pattern speed of 27 km s−1 kpc−1, when the corotation radius is at 50 arcsec, i.e. 1.1 times the radial length of the bar. This result is supported by the gas and dust lane morphologies, star formation distribution, projected velocity field and overall morphology. We find that star formation is most likely to be triggered close to the large-scale shocks and dust lanes in the bar. The net gas inflow rate in the simulations at 1-kpc radius is 4–6 M⊙ yr−1 at intermediate times.

Keywords: hydrodynamics; galaxies: individual: NGC 7479; galaxies: ISM; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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