AAS 207th Meeting, 8-12 January 2006
Session 179 Evolution of Galaxies, and Galaxies Surveys at Low Redshift
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[179.10] Evolution of Gaseous Disks Driven by a Rotating Strong Bar

D.C-C. Yen (Fu Jen Catholic University, Taiwan, ROC), C. Yuan, L-H. Lin (Institue of Astronomy and Astrophysics, Academia Sinica, Taiwan, ROC)

Recent observations have given amazing details of the nearby galaxies with a major bar, such as NGC1300 and NGC1097. In this study, we will show that such observations can be reproduced by imposing a strong bar to a gaseous disk system. However, a strong bar has always been a challenge to the numerical simulation community, because the high amplitude of the perturbation often leads to chaos and numerical instabilities. The Antares codes we have developed, which use the high order Godunov scheme and Godunov splitting via exact Riemann solver, prove to be a better and effective tool for such problems. We will report the results of our high resolution simulations and show that, with a sufficient strong bar potential, the straight dust lanes and a central star formation ring, similar to those seen in NGC1300, can be generated in the process and remain stable for sufficiently long time. The work is in parts supported by a grant from National Science Council, Taiwan, NSC94-2752-M-001-002-PAE.

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