Doctoral Dissertation Research: International: Fueling of Faint Active Galactic Nuclei: Obscured or Intrinsically Weak

该项目延续了亚利桑那大学研究生Jonathan Trump和爱媛大学（日本）教授Yoshiaki Taniguchi的合作。他们的研究中心是超大质量黑洞（SMBHs），这种黑洞存在于所有星系的中心，质量是太阳的数百万到数十亿倍。遥远宇宙中的SMBHs是明亮的，因为它们迅速吸积附近的恒星和气体，而大多数本地的SMBHs（如银河系中心的一个）是被动的，非常微弱。特朗普和PI使用美国运营的麦哲伦望远镜领导宇宙光谱，而谷口教授使用日本运营的斯巴鲁望远镜领导光学光度测定。他们之前的工作提出了高吸积的远距离SMBHs和本地被动SMBHs之间过渡阶段的第一个证据。该计划将使用光学光度法来识别更弱的吸积SMBHs，这些吸积太微弱而无法进行光谱分析，其目标是将吸积的增加与星系演化和燃料历史的变化联系起来。该项目还将使用一种只有在日本运营的斯巴鲁望远镜上才能使用的仪器，来寻找微弱吸积的SMBHs中遮挡和隐藏燃料的特征。拟议的研究中心对PI准备一篇关于黑洞演化到适度质量例子的流行文章的更广泛影响，以及Jonathan Trump在爱媛大学的外展工作，他将在那里指导当地研究生用英语演讲的技能，并通过使用期刊俱乐部活动来调查研究文献。

This program continues the collaboration between University of Arizona graduate student Jonathan Trump and Ehime University (Japan) Professor Yoshiaki Taniguchi. Their research centers on supermassive black holes (SMBHs), which are found in the centers of all galaxies and are millions to billions of times more massive than our sun. SMBHs in the distant universe are bright because they rapidly accrete nearby stars and gas, while most local SMBHs (such as the one at the center of the Milky Way galaxy) are passive and extremely faint. Trump and the PI have led COSMOS spectroscopy using the US-operated Magellan telescope, while Professor Taniguchi has led the optical photometry using the Japan-operated Subaru telescope. Their previous work has suggested the first evidence for a transition phase between highly accreting distant SMBHs and local passive SMBHs. This program will use the optical photometry to identify more weakly accreting SMBHs that were too faint for spectroscopy, with the goal of connecting the increase in accretion to a change in galaxy evolution and fueling history. The program will also use spectropolarimetry with an instrument available only on the Japan-operated Subaru telescope, looking for signatures of obscuration and hidden fueling in the weakly accreting SMBHs. The broader impacts of the proposed research center on the preparation by the PI of a popular article on the evolution of black holes down to modest mass examples, and the outreach work of Jonathan Trump at Ehime University, where he will coach local graduate students on skills in giving presentations in English and on surveying research literature through the use of journal club activities.