Globular Cluster Formation from Colliding Substructure
文献类型：期刊论文
| 作者 | Madau, Piero1,6; Lupi, Alessandro2; Diemand, Jurg3; Burkert, Andreas4,5; Lin, Douglas N. C.1,7,8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2020-02-10 |
| 卷号 | 890期号:1页码:14 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab66c6 |
| 英文摘要 | We investigate a scenario where the formation of globular clusters (GCs) is triggered by high-speed collisions between infalling atomic-cooling subhalos during the assembly of the main galaxy host, a special dynamical mode of star formation that operates at high gas pressures and is intimately tied to Lambda CDM hierarchical galaxy assembly. The proposed mechanism would give origin to "naked" globular clusters as colliding dark matter subhalos and their stars will simply pass through one another while the warm gas within them clashes at highly supersonic speed and decouples from the collisionless component, in a process reminiscent of the Bullet galaxy cluster. We find that the resulting shock-compressed layer cools on a timescale that is typically shorter than the crossing time, first by atomic line emission and then via fine-structure metal-line emission, and is subject to gravitational instability and fragmentation. Through a combination of kinetic theory approximation and high-resolution N-body simulations, we show that this model may produce: (a) a GC number-halo mass relation that is linear down to dwarf galaxy scales and agrees with the trend observed over five orders of magnitude in galaxy mass; (b) a population of old globular clusters with a median age of 12 Gyr and an age spread similar to that observed; (c) a spatial distribution that is biased relative to the overall mass profile of the host; and (d) a bimodal metallicity distribution with a spread similar to that observed in massive galaxies. |
| WOS关键词 | DARK-MATTER SUBSTRUCTURE ; CLOUD-CLOUD COLLISIONS ; BLACK-HOLE FORMATION ; MILKY-WAY ; STAR-FORMATION ; DWARF GALAXIES ; GRAVITATIONAL-INSTABILITY ; MASS FUNCTION ; ACS SURVEY ; H I |
| 资助项目 | NASA[15-WFIRST15-0004] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000522095800018 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | NASA ; NASA ; NASA ; NASA ; NASA ; NASA ; NASA ; NASA |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55670]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Madau, Piero |
| 作者单位 | 1.Univ Calif Santa Cruz, Dept Astron & Astrophys, 1156 High St, Santa Cruz, CA 95064 USA 2.Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy 3.Cisco Syst Switzerland GmbH, Richtistr 7, CH-8304 Zurich, Switzerland 4.Univ Observ Munich USM, Scheinerstr 1, D-81679 Munich, Germany 5.Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany 6.Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 7.Natl Astron Observ China, Beijing, Peoples R China 8.Tsinghua Univ, Inst Adv Studies, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Madau, Piero,Lupi, Alessandro,Diemand, Jurg,et al. Globular Cluster Formation from Colliding Substructure[J]. ASTROPHYSICAL JOURNAL,2020,890(1):14. |
| APA | Madau, Piero,Lupi, Alessandro,Diemand, Jurg,Burkert, Andreas,&Lin, Douglas N. C..(2020).Globular Cluster Formation from Colliding Substructure.ASTROPHYSICAL JOURNAL,890(1),14. |
| MLA | Madau, Piero,et al."Globular Cluster Formation from Colliding Substructure".ASTROPHYSICAL JOURNAL 890.1(2020):14. |
入库方式： OAI收割
来源：国家天文台
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