IMAGES. I. Strong evolution of galaxy kinematics since z=1
文献类型：期刊论文
| 作者 | Yang, Y.1; Flores, H.1; Hammer, F.1; Neichel, B.1; Puech, M.1,2; Nesvadba, N.1; Rawat, A.1,3; Cesarsky, C.2; Lehnert, M.1; Pozzetti, L.4 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2008 |
| 卷号 | 477期号:3页码:789-805 |
| 关键词 | galaxies : formation galaxies : evolution galaxies : kinematics and dynamics |
| 英文摘要 | Nearly half the stellar mass of present-day spiral galaxies has formed since z = 1, and galaxy kinematics is an ideal tool to identify the underlying mechanisms responsible for the galaxy mass assembly since that epoch. Here, we present the first results of the ESO large program, " IMAGES", which aims at obtaining robust measurements of the kinematics of distant galaxies using the multi-IFU mode of GIRAFFE on the VLT. 3D spectroscopy is essential to robustly measure the often distorted kinematics of distant galaxies (e.g., Flores et al. 2006, A& A, 455, 107). We derive the velocity fields and sigma-maps of 36 galaxies at 0.4 < z < 0.75 from the kinematics of the [O II] emission line doublet, and generate a robust technique to identify the nature of the velocity fields based on the pixels of the highest signal-to-noise ratios (S/N). Combining these observations with those of Flores et al., we have gathered a unique sample of 63 velocity fields of emission line galaxies (W-0([O II]) >= 15 angstrom) at z = 0.4-0.75, which are a representative subsample of the population of M-stellar >= 1.5 x 10(10) M circle dot emission line galaxies in this redshift range, and are largely unaffected by cosmic variance. Taking into account all galaxies -with or without emission lines -in that redshift range, we find that at least 41 +/- 7% of them have anomalous kinematics, i.e., they are not dynamically relaxed. This includes 26 +/- 7% of distant galaxies with complex kinematics, i.e., they are not simply pressure or rotationally supported. Our result implies that galaxy kinematics are among the most rapidly evolving properties, because locally, only a few percent of the galaxies in this mass range have complex kinematics. It is well-established that galaxies undergoing a merger have complex large-scale motions and thus are likely responsible for the strong evolution of the galaxy kinematics that we observe. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000252131000014 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7328]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Paris Diderot, CNRS, Observ Paris, GEPI, F-92195 Meudon, France 2.ESO, D-85748 Garching, Germany 3.Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India 4.INAF, Osservatorio Astron Bologna, I-40127 Bologna, Italy 5.Astron Observ Marseille Provence, Lab Astrophys Marseille, F-13248 Marseille, France 6.MPIA, D-69117 Heidelberg, Germany 7.INAF, Osservatorio Astrofis Arcetri, I-50125 Florence, Italy 8.Ctr Rech Astron Lyon, F-69561 St Genis Laval, France 9.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 10.AlbaNova Univ Ctr, Stockholm Observ, Stockholm Ctr Phys Astron & Biotechnol, S-10691 Stockholm, Sweden |
| 推荐引用方式 GB/T 7714 | Yang, Y.,Flores, H.,Hammer, F.,et al. IMAGES. I. Strong evolution of galaxy kinematics since z=1[J]. ASTRONOMY & ASTROPHYSICS,2008,477(3):789-805. |
| APA | Yang, Y..,Flores, H..,Hammer, F..,Neichel, B..,Puech, M..,...&Wozniak, H..(2008).IMAGES. I. Strong evolution of galaxy kinematics since z=1.ASTRONOMY & ASTROPHYSICS,477(3),789-805. |
| MLA | Yang, Y.,et al."IMAGES. I. Strong evolution of galaxy kinematics since z=1".ASTRONOMY & ASTROPHYSICS 477.3(2008):789-805. |
入库方式： OAI收割
来源：国家天文台
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