UNCERTAINTIES IN THE DEPROJECTION OF THE OBSERVED BAR PROPERTIES
文献类型：期刊论文
| 作者 | Zou, Yanfei1,2; Shen, Juntai1 ; Li, Zhao-Yu1
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-08-10 |
| 卷号 | 791期号:1页码:11-27 |
| 关键词 | galaxies: fundamental parameters galaxies: photometry galaxies: structure |
| 通讯作者 | 沈俊太 |
| 英文摘要 | In observations, it is important to deproject the two fundamental quantities characterizing a bar, i.e., its length (a) and ellipticity (e), to face-on values before any careful analyses. However, systematic estimation on the uncertainties of the commonly used deprojection methods is still lacking. Simulated galaxies are well suited in this study. We project two simulated barred galaxies onto a two-dimensional (2D) plane with different bar orientations and disk inclination angles (i). Bar properties are measured and deprojected with the popular deprojection methods in the literature. Generally speaking, deprojection uncertainties increase with increasing i. All of the deprojection methods behave badly when i is larger than 60 degrees, due to the vertical thickness of the bar. Thus, future statistical studies of barred galaxies should exclude galaxies more inclined than 60 degrees. At moderate inclination angles (i <= 60 degrees), 2D deprojection methods (analytical and image stretching), and Fourier-based methods (Fourier decomposition and bar-interbar contrast) perform reasonably well with uncertainties similar to 10% in both the bar length and ellipticity, whereas the uncertainties of the one-dimensional (1D) analytical deprojection can be as high as 100% in certain extreme cases. We find that different bar measurement methods show systematic differences in the deprojection uncertainties. We further discuss the deprojection uncertainty factors with the emphasis on the most important one, i.e., the three-dimensional structure of the bar itself. We construct two triaxial toy bar models that can qualitatively reproduce the results of the 1D and 2D analytical deprojections; they confirm that the vertical thickness of the bar is the main source of uncertainties. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SPIRAL GALAXIES ; SECULAR EVOLUTION ; SURFACE PHOTOMETRY ; MILKY-WAY ; GALACTIC BULGE ; DISC GALAXIES ; STELLAR BARS ; RED CLUMP ; DYNAMICAL FRICTION ; DARK-MATTER |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000339657700011 |
| 公开日期 | 2015-02-14 |
| 源URL | [http://119.78.226.72//handle/331011/15790]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Zou, Yanfei,Shen, Juntai,Li, Zhao-Yu. UNCERTAINTIES IN THE DEPROJECTION OF THE OBSERVED BAR PROPERTIES[J]. ASTROPHYSICAL JOURNAL,2014,791(1):11-27. |
| APA | Zou, Yanfei,Shen, Juntai,&Li, Zhao-Yu.(2014).UNCERTAINTIES IN THE DEPROJECTION OF THE OBSERVED BAR PROPERTIES.ASTROPHYSICAL JOURNAL,791(1),11-27. |
| MLA | Zou, Yanfei,et al."UNCERTAINTIES IN THE DEPROJECTION OF THE OBSERVED BAR PROPERTIES".ASTROPHYSICAL JOURNAL 791.1(2014):11-27. |
入库方式： OAI收割
来源：上海天文台
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