Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile
文献类型：期刊论文
| 作者 | Pu SB(浦仕毕)1,2,3 ; Saglia, RP3,4; Fabricius, MH3,4; Thomas, J3,4; Bender, R3,4; Han ZW(韩占文)1,5
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2010-06 |
| 卷号 | 516 |
| 关键词 | galaxies: elliptical and lenticular, cD Galaxy: abundances galaxies: kinematics and dynamics galaxies: individual: NGC4125 galaxies: individual: NGC7619 galaxies: individual: NGC1600 |
| ISSN号 | 0004-6361 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Pu, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | We present high quality long slit spectra along the major and minor axes out to 1.5-2 R(e) (14-22 kpc) of three bright elliptical galaxies (NGC 1600, NGC 4125, NGC 7619) obtained at the Hobby-Eberly Telescope (HET). We derive stellar kinematic profiles and Lick/IDS indices (H beta, Mgb, Fe(5015), Fe(5270), Fe(5335), Fe(5406)). Moreover, for NGC 4125 we derive gas kinematics and emission line strengths. We model the absorption line strengths using Simple Stellar Populations models that take into account the variation of [alpha/Fe] and derive ages, total metallicity and element abundances. Overall, we find that the three galaxies have old and [alpha/Fe] over-abundant stellar populations with no significant gradients. The metallicity is supersolar at the center with a strong negative radial gradient. For NGC 4125, several pieces of evidence point to a recent dissipational merger event. We calculate the broad band color profiles with the help of SSP models. All of the colors show sharp peaks at the center of the galaxies, mainly caused by the metallicity gradients, and agree well with the measured colors. Using the Schwarzschild's axisymmetric orbit superposition technique, we model the stellar kinematics to constrain the dark halos of the galaxies. We use the tight correlation between the Mgb strength and local escape velocity to set limits on the extent of the halos by testing different halo sizes. Logarithmic halos - cut at 60 kpc - minimize the overall scatter of the Mgb-V(esc) relation. Larger cutoff radii are found if the dark matter density profile is decreasing more steeply at large radii. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | EARLY-TYPE GALAXIES ; STAR-FORMATION HISTORY ; BRIGHTEST CLUSTER GALAXIES ; DYNAMICALLY HOT GALAXIES ; COLOR-MAGNITUDE RELATION ; LINE-STRENGTH GRADIENTS ; FUNDAMENTAL PLANE ; GLOBULAR-CLUSTERS ; SAURON PROJECT ; LENTICULAR GALAXIES |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2010/08/aa14395-10/aa14395-10.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000280275400019 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4498]  |
| 专题 | 云南天文台_大样本恒星演化研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.National Astronomical Observatory/Yunnan Observatory, the Chinese Academy of Sciences, Kunming 650011, PR China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China 3.Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany 4.Universitätssternwarte, München, Scheinerstrae 1, 81679 München, Germany 5.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China |
| 推荐引用方式 GB/T 7714 | Pu SB,Saglia, RP,Fabricius, MH,et al. Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile[J]. ASTRONOMY & ASTROPHYSICS,2010,516. |
| APA | Pu SB,Saglia, RP,Fabricius, MH,Thomas, J,Bender, R,&Han ZW.(2010).Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile.ASTRONOMY & ASTROPHYSICS,516. |
| MLA | Pu SB,et al."Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile".ASTRONOMY & ASTROPHYSICS 516(2010). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。