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乔纳森·特朗普和爱慕大学(日本)教授谷口义明之间的合作。他们的研究中心是超大质量黑洞(SMBH)，这些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SMBH是明亮的，因为它们快速地附着在附近的恒星和气体中，而大多数本地SMBH(如银河系中心的SMBH)是被动的，并且非常微弱。特朗普和少年派使用美国运营的麦哲伦望远镜领导了宇宙光谱学，而谷口教授使用日本运营的斯巴鲁望远镜领导了光学光度测量。他们之前的工作首次提出了在高度吸积的远距离SMBH和局部被动SMBH之间存在过渡阶段的证据。这个项目将使用光学光度学来识别更弱的吸积SMBH，这些SMBH太暗而不能进行光谱分析，目的是将吸积的增加与星系演化的变化联系起来，并为历史提供燃料。该计划还将使用偏振光谱技术，使用一种只能在日本运营的斯巴鲁望远镜上使用的仪器，在弱吸积的SMBH中寻找遮挡和隐藏燃料的迹象。拟议的研究中心对PI准备一篇关于黑洞演化的热门文章的更广泛影响，以及乔纳森·特朗普在爱慕大学的外联工作，他将在那里指导当地研究生用英语发表演讲的技能，以及通过使用期刊俱乐部活动调查研究文献的技能。

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.