Creation and Destruction of Dwarf Galaxies in Interactions: Evaluating the Environmental Influences and the Global Importance

相互作用中矮星系的产生和毁灭：评估环境影响和全球重要性

• 批准号: 0071223
• 负责人: Jane Charlton
• 金额: $ 18.15万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-15 至 2005-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0071223&HistoricalAwards=false
• 关键词: Creation; Destruction; Dwarf; Galaxies; Interactions

AST-0071223Jane CharltonThe aim of this proposal is to conduct a detailed investigation of 838 dwarf galaxy candidates in 34 Hickson Compact groups. The plan is to obtain spectroscopy (to derive metalicities), multiband imaging (to investigate stellar populations and ages) and HI observations (to identify tidal tails). These observations will be used to try and distinguish between dwarf galaxies which have been formed in the debris left behind when larger galaxies were tidally disrupted and those which were formed primordially.Tidal dwarf galaxies have long been recognized as occasional interlopers in the debris of galaxy interactions. The proposers have recently conducted a census of the dwarf galaxy population in Hickson compact groups, and the results strongly suggest that tidal dwarf galaxy formation is quite common. Depending on the survivability of the population, this process may be quite significant, even as compared to primordial formation of dwarfs. The proposed project incorporates spectra obtained with the 8-m Hobby-Eberly Telescope, Hubble Space Telescope images, and Very Large array radio maps of the neutral Hydrogen from which the dwarfs form. With these data, we will compare properties of tidal dwarf galaxies to the galaxies at large in the groups, look for HI bridges connecting departing dwarfs to their parents, and assess the survivability of the dwarfs in the compact group environment. If the results of this study are extrapolated to consider other environments, it will be possible to evaluate if tidal dwarf formation is merely one of the occasional curiosities of the universe, or if it is important to our overall understanding of galaxy formation. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***

AST-0071223JANE CHARLTON THE AS该提案的目的是对34个希克森紧凑型组中的838个矮人星系候选人进行详细研究。该计划是获得光谱学（得出金属率），多播成像（研究恒星种群和年龄）和HI观测值（以识别潮汐尾巴）。这些观察结果将用于尝试并区分矮星系，这些星系在潮汐破坏较大的星系时留下的碎片中形成，而那些被原始形成的星系。长期以来一直认为是偶尔被认为是银河相互作用碎片的偶尔散发器。提议者最近对希克森紧凑型组的矮星系人口进行了人口普查，结果强烈表明潮汐矮星系的形成很普遍。 根据人口的生存能力，即使与矮人的原始形成相比，这个过程也可能非常重要。提出的项目结合了使用8米的嗜热心望远镜，哈勃太空望远镜图像以及矮矮人形成的中性氢的非常大的阵列无线电图获得的光谱。借助这些数据，我们将比较潮汐矮星系的特性与整体中的整个星系，寻找将出发矮人与父母相连的hi桥，并评估矮人在紧凑型组环境中的生存能力。 如果将这项研究的结果推算出来考虑其他环境，则可以评估潮汐矮人的形成是否仅仅是宇宙偶尔的好奇心之一，还是对于我们对星系形成的整体理解很重要。该项目的资金由NSF外乳术天文学和宇宙学计划（AST/EXC）提供。***