FORMING DOUBLE-BARRED GALAXIES FROM DYNAMICALLY COOL INNER DISKS
文献类型：期刊论文
| 作者 | Du, Min1,2; Shen, Juntai1 ; Debattista, Victor P.3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-05-10 |
| 卷号 | 804期号:2页码:1 |
| 关键词 | galaxies: evolution galaxies: formation galaxies: kinematics and dynamics galaxies: stellar content galaxies: structure |
| 英文摘要 | About one-third of early-type barred galaxies host small-scale secondary bars. The formation and evolution of such double-barred (S2B) galaxies remain far from being well understood. In order to understand the formation of such systems, we explore a large parameter space of isolated pure-disk simulations. We show that a dynamically cool inner disk embedded in a hotter outer disk can naturally generate a steady secondary bar while the outer disk forms a large-scale primary bar. The independent bar instabilities of inner and outer disks result in long-lived double-barred structures whose dynamical properties are comparable to those in observations. This formation scenario indicates that the secondary bar might form from the general bar instability, the same as the primary bar. Under some circumstances, the interaction of the bars and the disk leads to the two bars aligning or single, nuclear, bars only. Simulations that are cool enough of the center to experience clump instabilities may also generate steady S2B galaxies. In this case, the secondary bars are "fast," i.e., the bar length is close to the co-rotation radius. This is the first time that S2B galaxies containing a fast secondary bar are reported. Previous orbit-based studies had suggested that fast secondary bars were not dynamically possible. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ACTIVE GALACTIC NUCLEI ; N-BODY SIMULATIONS ; DOUBLE BARS ; SPIRAL GALAXIES ; PATTERN SPEEDS ; NESTED BARS ; ORBITS ; INSTABILITIES ; KINEMATICS ; SPHEROIDS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000354905000061 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18335]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ China Acad Sci, Beijing 100049, Peoples R China 3.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England |
| 推荐引用方式 GB/T 7714 | Du, Min,Shen, Juntai,Debattista, Victor P.. FORMING DOUBLE-BARRED GALAXIES FROM DYNAMICALLY COOL INNER DISKS[J]. ASTROPHYSICAL JOURNAL,2015,804(2):1. |
| APA | Du, Min,Shen, Juntai,&Debattista, Victor P..(2015).FORMING DOUBLE-BARRED GALAXIES FROM DYNAMICALLY COOL INNER DISKS.ASTROPHYSICAL JOURNAL,804(2),1. |
| MLA | Du, Min,et al."FORMING DOUBLE-BARRED GALAXIES FROM DYNAMICALLY COOL INNER DISKS".ASTROPHYSICAL JOURNAL 804.2(2015):1. |
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来源：上海天文台
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