Collaborative Research: Observing the Cosmic Evolution of Neutral Hydrogen

合作研究：观测中性氢的宇宙演化

• 批准号: 1814486
• 负责人: Sheila Kannappan
• 金额: $ 26.61万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1814486&HistoricalAwards=false
• 关键词: Collaborative; Research; Observing; Cosmic; Evolution

Hydrogen is the most abundant element in the universe, and neutral hydrogen atoms are thus an important constituent of interstellar gas in galaxies ? but also one of the most challenging to study. The faintness of neutral hydrogen emission means that it can only be detected beyond the nearby universe via long observations with large telescopes. A new telescope with improved sensitivity, the MeerKAT array, will examine how galaxies' neutral gas reservoirs have evolved over two thirds of the universe's history (i.e., the last nine billion years of cosmic time). It will determine how galaxies' neutral atomic hydrogen content relates to the properties of their stars, their environments, and their cosmic epochs. This will be compared with theoretical predictions in order to understand how gas flows into and out of galaxies and forms new stars while inside galaxies. The research will support the training of graduate and undergraduate students at the four universities; graduate students will gain additional experience in computation and statistics, research mentorship, education in STEM disciplines, and outreach to a variety of audiences.This survey will probe neutral hydrogen (HI) in emission to an unprecedentedly high redshift of z = 1.45. The combination of individual and stacked HI detections ? complemented by theoretical modelling, multiwavelength observations, and a rich z = 0 reference dataset ? will probe the evolution of (i) the baryonic Tully-Fisher relation, (ii) the HI mass function, and (iii) the dependence of galaxies' HI content on stellar and dark matter properties. OH megamasers detected as strong line emitters in the MeerKAT data will be used to place constraints on the cosmic history of gas-rich galaxy mergers. Both the HI survey data and the instructional modules used to provide student training will be publicly released as part of the project.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

因此，氢是宇宙中最丰富的元素，因此中性氢原子是星系中星际气体的重要组成部分？这也是最具挑战性的研究之一。中性氢发射的晕厥意味着它只能通过大型望远镜观察到附近宇宙之外的宇宙之外。具有提高灵敏度的新望远镜Meerkat阵列将研究星系的中性气体储层如何在宇宙历史的三分之二（即宇宙时间的最后90亿年）中演变出来。它将决定星系中立的原子氢含量与恒星，环境和宇宙时代的特性有关。这将与理论预测进行比较，以便了解气体在星系内部时如何流入和流出新恒星。该研究将支持四所大学的研究生和本科生的培训；研究生将在计算和统计学，研究指导，STEM学科的教育以及向各种受众的宣传方面获得额外的经验。这项调查将探究中性氢（HI），以排放为前所未有的Z = 1.45。个人和堆叠HI检测的组合？ 以理论建模，多波长观测和丰富的Z = 0参考数据集的补充？将探测（i）Baryonic Tully-fisher关系的演变，（ii）HI质量函数，以及（iii）星系HI含量对恒星和暗物质特性的依赖性。 OH Megamasers在Meerkat数据中被发现为强线发射器将用于对富含气体的银河系合并的宇宙历史施加限制。 HI调查数据和用于提供学生培训的教学模块都将作为该项目的一部分公开发布。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来获得支持。

项目成果

Looking at the Distant Universe with the MeerKAT Array: Discovery of a Luminous OH Megamaser at z > 0.5

用 MeerKAT 阵列观察遥远的宇宙：发现 z > 0.5 的发光 OH 巨脉泽

• DOI: 10.3847/2041-8213/ac63b0
• 发表时间: 2022
• 期刊: The Astrophysical Journal Letters
• 作者: Glowacki, Marcin;Collier, Jordan D.;Kazemi-Moridani, Amir;Frank, Bradley;Roberts, Hayley;Darling, Jeremy;Klöckner, Hans-Rainer;Adams, Nathan;Baker, Andrew J.;Bershady, Matthew
• 通讯作者: Bershady, Matthew

The RESOLVE and ECO Gas in Galaxy Groups Initiative: The Group Finder and the Group H i–Halo Mass Relation

• DOI: 10.3847/1538-4357/acefd4
• 发表时间: 2023-10
• 期刊: The Astrophysical Journal
• 作者: Z. L. Hutchens;S. Kannappan;A. Berlind;Mehnaaz Asad;K. Eckert;David V. Stark;Derrick S. Carr;Ella R. Castelloe;Andrew J. Baker;Kelley M. Hess;A. Moffett;M. Norris;D. Croton

Optical, Radio Continuum and HI Deep Spectroscopic Survey (ORCHIDSS)

光学、射电连续谱和 HI 深光谱巡天 (ORCHIDSS)

• 发表时间: 2023
• 期刊: The Messenger
• 作者: Duncan, K.;Baker, A.;Best, P.;Blyth, S.;Hatch, N.;Holwerda, B.;Jarvis, M.;Maddox, N.;Smith, D. J.;Arnaudova, M.
• 通讯作者: Arnaudova, M.