The X-shaped Milky Way bulge in OGLE-III photometry and in N-body models
文献类型：期刊论文
| 作者 | Nataf, David M.1; Udalski, Andrzej2; Skowron, Jan2; Szymanski, Michal K.2; Kubiak, Marcin2; Pietrzynski, Grzegorz2,3; Soszynski, Igor2; Ulaczyk, Krzysztof2; Wyrzykowski, Lukasz2,4; Poleski, Radoslaw2,5 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-02-21 |
| 卷号 | 447期号:2页码:1535-1549 |
| 关键词 | Galaxy: bulge Galaxy: stellar content Galaxy: structure |
| 英文摘要 | We model the split red clump of the Galactic bulge in OGLE-III photometry, and compare the results to predictions from two N-body models. Our analysis yields precise maps of the brightness of the two red clumps, the fraction of stars in the more distant peak, and their combined surface density. We compare the observations to predictions from two N-body models previously used in the literature. Both models correctly predict several features as long as one assumes an angle alpha(Bar) approximate to 30 degrees between the Galactic bar's major axis and the line of sight to the Galactic Centre. In particular that the fraction of stars in the faint red clump should decrease with increasing longitude. The biggest discrepancies between models and data are in the rate of decline of the combined surface density of red clump stars towards negative longitudes and of the brightness difference between the two red clumps towards positive longitudes, with neither discrepancy exceeding similar to 25 per cent in amplitude. Our analysis of the red giant luminosity function also yields an estimate of the red giant branch bump parameters towards these high-latitude fields, and evidence for a high rate (similar to 25 per cent) of disc contamination in the bulge at the colour and magnitude of the red clump, with the disc contamination rate increasing towards ightlines further distant from the plane. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GRAVITATIONAL LENSING EXPERIMENT ; GIANT BRANCH BUMP ; STELLAR EVOLUTION DATABASE ; FLAMES-GIRAFFE SPECTRA ; RED CLUMP GIANTS ; GALACTIC BULGE ; POPULATION SYNTHESIS ; LUMINOSITY FUNCTION ; 3-DIMENSIONAL BARS ; ORBITAL DYNAMICS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350272900045 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18219]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 2.Univ Warsaw Observ, PL-00478 Warsaw, Poland 3.Univ Concepcion, Dept Astron, Concepcion, Chile 4.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England 5.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA 6.Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France 7.Max Planck Inst Astron, D-69117 Heidelberg, Germany 8.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Nataf, David M.,Udalski, Andrzej,Skowron, Jan,et al. The X-shaped Milky Way bulge in OGLE-III photometry and in N-body models[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,447(2):1535-1549. |
| APA | Nataf, David M..,Udalski, Andrzej.,Skowron, Jan.,Szymanski, Michal K..,Kubiak, Marcin.,...&Li, Zhao-Yu.(2015).The X-shaped Milky Way bulge in OGLE-III photometry and in N-body models.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,447(2),1535-1549. |
| MLA | Nataf, David M.,et al."The X-shaped Milky Way bulge in OGLE-III photometry and in N-body models".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447.2(2015):1535-1549. |
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