ON THE INFLUENCE OF MINOR MERGERS ON THE RADIAL ABUNDANCE GRADIENT IN DISKS OF MILKY-WAY-LIKE GALAXIES
文献类型：期刊论文
| 作者 | Zinchenko, Igor A.1,2; Berczik, Peter1,2,3 ; Grebel, Eva K.2; Pilyugin, Leonid S.1,2,4; Just, Andreas2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-06-20 |
| 卷号 | 806期号:2 |
| 关键词 | galaxies: abundances galaxies: evolution galaxies: kinematics and dynamics |
| 英文摘要 | We investigate the influence of stellar migration caused by minor mergers (mass ratio from 1: 70 to 1: 8) on the radial distribution of chemical abundances in the disks of Milky-Way-like galaxies during the last 4 Gyr. A GPU-based pure N-body tree-code model without hydrodynamics and star formation was used. We computed a large set of mergers with different initial satellite masses, positions, and orbital velocities. We find that there is no significant metallicity change at any radius of the primary galaxy in the case of the accretion of a low-mass satellite of 10(9) M-circle dot (mass ratio 1: 70) except for the special case of a prograde satellite motion in the disk plane of the host galaxy. The accretion of a satellite of mass >= 3 x 10(9) M-circle dot (mass ratio 1: 23) results in an appreciable increase of the chemical abundances at galactocentric distances larger than similar to 10 kpc. The radial abundance gradient flattens in the range of galactocentric distances from 5 to 15 kpc in the case of a merger with a satellite with mass. 3 x 109 M.. There is no significant change in the abundance gradient slope in the outer disk (from similar to 15 kpc up to 25 kpc) in any merger while the scatter in metallicities at a given radius significantly increases for most of the satellite's initial masses/positions compared to the case of an isolated galaxy. This argues against attributing the break (flattening) of the abundance gradient near the optical radius observed in the extended disks of Milky-Way-like galaxies only to merger-induced stellar migration. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000357129500122 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5655]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine 2.Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany 3.Chinese Acad Sci, Natl Astron Observ China, Beijing 1000128, Peoples R China 4.Kazan Fed Univ, Kazan 420008, Russia |
| 推荐引用方式 GB/T 7714 | Zinchenko, Igor A.,Berczik, Peter,Grebel, Eva K.,et al. ON THE INFLUENCE OF MINOR MERGERS ON THE RADIAL ABUNDANCE GRADIENT IN DISKS OF MILKY-WAY-LIKE GALAXIES[J]. ASTROPHYSICAL JOURNAL,2015,806(2). |
| APA | Zinchenko, Igor A.,Berczik, Peter,Grebel, Eva K.,Pilyugin, Leonid S.,&Just, Andreas.(2015).ON THE INFLUENCE OF MINOR MERGERS ON THE RADIAL ABUNDANCE GRADIENT IN DISKS OF MILKY-WAY-LIKE GALAXIES.ASTROPHYSICAL JOURNAL,806(2). |
| MLA | Zinchenko, Igor A.,et al."ON THE INFLUENCE OF MINOR MERGERS ON THE RADIAL ABUNDANCE GRADIENT IN DISKS OF MILKY-WAY-LIKE GALAXIES".ASTROPHYSICAL JOURNAL 806.2(2015). |
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来源：国家天文台
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