A Multi-Sightline Investigation of the Complex Circumgalactic Medium

复杂环银河系介质的多视线研究

• 批准号: 1715692
• 负责人: Hsiao-Wen Chen
• 金额: $ 40.42万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715692&HistoricalAwards=false
• 关键词: Multi; Sightline; Investigation; Complex; Circumgalactic

Astronomers seek to understand how stars and galaxies formed. Galaxies exist in relation to the diffuse gas that surrounds them. Understanding this relationship is essential for understanding how galaxies, including our own galaxy (the Milky Way), came into being. To probe diffuse gas, astronomers use fortuitously aligned, bright background sources that illuminate it. Chen and collaborators take this method one step further. They use background sources that have been gravitationally lensed to yield multiple images. These images probe the gas from multiple lines of sight simultaneously. This project will produce the first survey of such galaxies and gas together. Investigators will discover the properties of this gas, including its spatial distribution. They will understand the inter-relationship between the surrounding gas and galaxies within. The PI will interact with underrepresented minority high school students through the Space Explorers Program. The PI will also engage undergraduates in summer research and support one PhD thesis. The PI will collaborate with Adler Planetarium to develop museum displays that communicate key findings of galaxy evolution. These activities inspire young people and the general public to participate in science.This proposed investigation utilizes multiply-lensed quasars (QSOs) and projected QSO pairs to resolve the motion and chemical enrichment of the CircumGalactic Medium (CGM). The galaxies span a range of morphologies and star formation histories. Specific scientific objectives include characterizing the diffuse gas halos, particularly its velocity distribution, its dependence upon galaxy properties, and its mechanism of formation. This project will produce the first large survey of dozens (~60) of spatially and spectrally resolved halo maps at projected distance d 100 kpc around both star-forming and passive galaxies in the range 0.4 z 1. This project extends prior studies by going to higher redshift and increasing sample size by an order of magnitude. It will contribute a deeper understanding of the relationship between diffuse CGM halo gas and star formation in galaxies.

天文学家试图了解恒星和星系是如何形成的。 镓是相对于围绕它们的扩散气体而存在的。 理解这种关系对于理解星系，包括我们自己的星系（银河系）是如何形成的至关重要。 为了探测弥漫的气体，天文学家使用偶然排列的明亮背景光源来照亮它。陈和合作者将这种方法更进一步。 他们使用已经被引力透镜化的背景源来产生多个图像。 这些图像同时从多个视线探测气体。 该项目将首次对此类星系和气体进行调查。 研究人员将发现这种气体的性质，包括其空间分布。 他们将了解周围气体和内部星系之间的相互关系。 PI将通过太空探索者计划与代表性不足的少数民族高中生互动。 PI还将让本科生参与暑期研究，并支持一篇博士论文。 PI将与阿德勒天文馆合作，开发博物馆展示，传达星系演化的关键发现。 这些活动激发了年轻人和公众参与科学的热情。这项拟议的调查利用多透镜类星体（QSO）和投影类星体对来解决环银河介质（CGM）的运动和化学富集。 这些星系的形态和星星形成历史各不相同。 具体的科学目标包括确定弥散气晕的特征，特别是其速度分布、对星系性质的依赖性及其形成机制。 这个项目将产生第一个大调查的几十（~60）的空间和光谱分辨晕图在投影距离d 100千秒差距周围的恒星形成和被动星系的范围内0.4 z 1。 该项目扩展了以前的研究，通过更高的红移和增加一个数量级的样本量。 这将有助于我们更深入地了解星系中弥漫CGM晕气体与星星形成的关系。

项目成果

A Giant Intragroup Nebula Hosting a Damped $\mathrm{Ly}\alpha $ Absorber at z = 0.313

一个巨大的群内星云，在 z = 0.313 处拥有阻尼 $mathrm{Ly}alpha $ 吸收体

• DOI: 10.3847/2041-8213/ab25ec
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Chen, Hsiao-Wen;Boettcher, Erin;Johnson, Sean D.;Zahedy, Fakhri S.;Rudie, Gwen C.;Cooksey, Kathy L.;Rauch, Michael;Mulchaey, John S.
• 通讯作者: Mulchaey, John S.

Empirical constraints on the turbulence in QSO host nebulae from velocity structure function measurements

速度结构函数测量对 QSO 宿主星云湍流的经验约束

• DOI: 10.1093/mnras/stac3193
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Mandy C.;Chen, Hsiao-Wen;Rauch, Michael;Qu, Zhijie;Johnson, Sean D.;Li, Jennifer I-Hsiu;Schaye, Joop;Rudie, Gwen C.;Zahedy, Fakhri S.;Boettcher, Erin
• 通讯作者: Boettcher, Erin

Resolved galactic superwinds reconstructed around their host galaxies at z > 3

在 z > 3 的宿主星系周围重建了已解决的银河超级风

• DOI: 10.1093/mnras/stab1041
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Mandy C;Chen, Hsiao-Wen;Gronke, Max;Rauch, Michael;Broadhurst, Tom
• 通讯作者: Broadhurst, Tom

Probing IGM accretion on to faint Lyα emitters at z ∼ 2.8

探测 z ≤ 2.8 处微弱 Lyα 发射体上的 IGM 吸积

• DOI: 10.1093/mnras/stz861
• 发表时间: 2019
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Zahedy, Fakhri S;Rauch, Michael;Chen, Hsiao-Wen;Carswell, Robert F;Stalder, Brian;Stark, Antony A
• 通讯作者: Stark, Antony A

Evidence for Late-time Feedback from the Discovery of Multiphase Gas in a Massive Elliptical at z = 0.4

• DOI: 10.3847/2041-8213/abc48d
• 发表时间: 2020-09
• 期刊: The Astrophysical Journal Letters
• 作者: F. Zahedy;Hsiao-Wen Chen;E. Boettcher;M. Rauch;K. Decker French;A. Zabludoff