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OUR MILKY WAY AS A PURE-DISK GALAXY-A CHALLENGE FOR GALAXY FORMATION
文献类型：期刊论文
| 作者 | Shen, Juntai1,2 ; Rich, R. Michael3; Kormendy, John2; Howard, Christian D.3,4; De Propris, Roberto5; Kunder, Andrea5
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2010-09-01 |
| 卷号 | 720期号:1页码:L72-L76 |
| 关键词 | Galaxy: bulge Galaxy: kinematics and dynamics galaxies: kinematics and dynamics |
| 英文摘要 | Bulges are commonly believed to form in the dynamical violence of galaxy collisions and mergers. Here, we model the stellar kinematics of the Bulge Radial Velocity Assay ( BRAVA) and find no sign that the Milky Way contains a classical bulge formed by scrambling pre-existing disks of stars in major mergers. Rather, the bulge appears to be a bar seen somewhat end-on, as hinted from its asymmetric boxy shape. We construct a simple but realistic N-body model of the Galaxy that self-consistently develops a bar. The bar immediately buckles and thickens in the vertical direction. As seen from the Sun, the result resembles the boxy bulge of our Galaxy. The model fits the BRAVA stellar kinematic data covering the whole bulge strikingly well with no need for a merger-made classical bulge. The bar in our best-fit model has a half-length of similar to 4 kpc and extends 20 degrees from the Sun-Galactic center line. We use the new kinematic constraints to show that any classical bulge contribution cannot be larger than similar to 8% of the disk mass. Thus, the Galactic bulge is a part of the disk and not a separate component made in a prior merger. Giant, pure-disk galaxies like our own present a major challenge to the standard picture in which galaxy formation is dominated by hierarchical clustering and galaxy mergers. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CENTRAL MASS CONCENTRATIONS ; RADIAL-VELOCITY ASSAY ; BAADES WINDOW GIANTS ; BODY BARRED MODELS ; KECK HIRES SPECTRA ; GALACTIC BULGE ; STELLAR PARAMETERS ; ABUNDANCE ANALYSIS ; ROTATION CURVE ; K GIANTS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000281610100015 |
| 公开日期 | 2015-02-02 |
| 源URL | [http://119.78.226.72//handle/331011/15513]  |
| 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 Texas Austin, Dept Astron, Austin, TX 78712 USA 3.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA 4.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA 5.Cerro Tololo Interamer Observ, La Serena, Chile |
| 推荐引用方式 GB/T 7714 | Shen, Juntai,Rich, R. Michael,Kormendy, John,et al. OUR MILKY WAY AS A PURE-DISK GALAXY-A CHALLENGE FOR GALAXY FORMATION[J]. ASTROPHYSICAL JOURNAL LETTERS,2010,720(1):L72-L76. |
| APA | Shen, Juntai,Rich, R. Michael,Kormendy, John,Howard, Christian D.,De Propris, Roberto,&Kunder, Andrea.(2010).OUR MILKY WAY AS A PURE-DISK GALAXY-A CHALLENGE FOR GALAXY FORMATION.ASTROPHYSICAL JOURNAL LETTERS,720(1),L72-L76. |
| MLA | Shen, Juntai,et al."OUR MILKY WAY AS A PURE-DISK GALAXY-A CHALLENGE FOR GALAXY FORMATION".ASTROPHYSICAL JOURNAL LETTERS 720.1(2010):L72-L76. |
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来源：上海天文台
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