Gas accretion on spiral galaxies: Bar formation and renewal

被引:292
作者
Bournaud, F
Combes, F
机构
[1] Ecole Normale Super, F-75005 Paris, France
[2] Observ Paris, DEMIRM, F-75014 Paris, France
关键词
galaxies : evolution; galaxies : spiral; methods : N-body simulations;
D O I
10.1051/0004-6361:20020920
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The effects of gas accretion on spiral disk dynamics and stability are studied through N-body simulations, including star formation and gas/stars mass exchange. The detailed processes of bar formation, bar destruction and bar re-formation are followed, while in the same time the disk to bulge ratio is varying. The accreted gas might be first prevented to flow inwards to the center by the bar gravity torques, which maintains it to the outer Lindblad resonance. While the first bar is weakening, the accreted gas replenishes the disk, increasing the disk-to-bulge ratio, and the disk self-gravity. A second bar is then unstable, with a higher pattern speed, due both to the increased mass, and shorter bar length. Three or four bar episodes have been followed over a Hubble time. Their strength is decreasing with time, while their pattern speed is increasing. Detailed balance of the angular momentum transfer and evolution can account for these processes. The gas recycled through star formation, and rejected through stellar mass loss plays also a role in the disk dynamics. Implications on the spiral galaxy dynamics and evolution along the Hubble sequence, and as a function of redshift are discussed.
引用
收藏
页码:83 / 102
页数:20
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