BAR FORMATION IN MILKY WAY TYPE GALAXIES
文献类型：期刊论文
| 作者 | Polyachenko, E. V.1; Berczik, P.2,3,4 ; Just, A.2
|
| 刊名 | BALTIC ASTRONOMY
 |
| 出版日期 | 2016 |
| 卷号 | 25期号:4页码:411-418 |
| 关键词 | galaxy: formation galaxy: evolution |
| 英文摘要 | Many barred galaxies, possibly including the Milky Way, have cusps in their centers. There is a widespread belief, however, that the usual bar instability, which occurs in bulgeless galaxy models, is impossible for cuspy models because of the presence of the inner Lindblad resonance for any pattern speed. At the same time, there is numerical evidence that the bar instability can form a bar. We analyze this discrepancy by performing accurate and diverse N-body simulations and calculating the normal modes. We show that bar formation in cuspy galaxies can be explained by taking into account the disk thickness. The exponential growth time is moderate (about 250 Myr) for typical current disk masses, but it increases considerably (by a factor of two or more) if the live halo and bulge are substituted by a rigid halo/bulge potential; the pattern speeds remain almost the same. Normal mode analysis with different disk mass favors a young bar hypothesis, according to which the bar instability has saturated only recently. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HUBBLE-DEEP-FIELDS ; GALACTIC DISCS ; SATELLITES ; EVOLUTION ; CODE |
| 收录类别 | SCI ; ISTP |
| 语种 | 英语 |
| WOS记录号 | WOS:000396644700009 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8227]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Russian Acad Sci, Inst Astron, Pyatnitskaya 48, Moscow 119017, Russia 2.Astronom Rechen Inst ZAH, Monchhofstr 12-14, D-69120 Heidelberg, Germany 3.Natl Acad Sci Ukraine, Main Astron Observ, 27 Akad Zabolotnoho St, UA-03680 Kiev, Ukraine 4.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Polyachenko, E. V.,Berczik, P.,Just, A.. BAR FORMATION IN MILKY WAY TYPE GALAXIES[J]. BALTIC ASTRONOMY,2016,25(4):411-418. |
| APA | Polyachenko, E. V.,Berczik, P.,&Just, A..(2016).BAR FORMATION IN MILKY WAY TYPE GALAXIES.BALTIC ASTRONOMY,25(4),411-418. |
| MLA | Polyachenko, E. V.,et al."BAR FORMATION IN MILKY WAY TYPE GALAXIES".BALTIC ASTRONOMY 25.4(2016):411-418. |
入库方式： OAI收割
来源：国家天文台
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