NGC 4608 and NGC 5701: Barred galaxies without disks?

被引:33
作者
Gadotti, DA [1 ]
de Souza, RE [1 ]
机构
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508900 Sao Paulo, Brazil
关键词
galaxies : evolution; galaxies : halos; galaxies; individual; (NGC; 4608; NGC; 5701); galaxies : structure; methods : n-body simulations;
D O I
10.1086/368159
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have performed for the first time in the literature a two-dimensional structural analysis on the barred lenticular and face-on galaxies NGC 4608 and NGC 5701. The results indicate that either these galaxies have never had large disks or their disks were almost completely destroyed by their strong bars because of secular evolution processes. We discuss these surprising conclusions, checking for signs of secular evolution, considering bar-forming instabilities, and suggesting, based on N-body simulations, a new mechanism to formbars in spheroids, which includes nonspherical halos. Quantitative predictions from our new mechanism are compared with those from other recent models for bar formation and evolution.
引用
收藏
页码:L75 / L78
页数:4
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