A New View of the Chemical Evolution of Nearby Galaxies with Keck and VLT Integral Field Spectroscopy

利用 Keck 和 VLT 积分场光谱观察邻近星系化学演化的新视角

• 批准号: 1816462
• 负责人: Karin Sandstrom
• 金额: $ 25.29万
• 依托单位: University of California-San Diego
• 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: 2018-10-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1816462&HistoricalAwards=false
• 关键词: New; View; Chemical; Evolution; Nearby

As stars evolve, they produce and distribute heavy elements (i.e. elements heavier than helium) into the interstellar gas. Over time, the heavy element content builds up in a galaxy, increasing the metallicity of the gas. Metallicity has an important role in governing how galaxies form new stars. Metallicity can also change because of inflow of gas from the galaxy's surroundings and outflows of gas from the galaxy disk caused by intense bursts of star formation. Once it is in a galaxy, gas with varying metallicity is mixed together by turbulence and flows. The local metallicity in a galaxy therefore reflects the competition between all of these factors. These investigators will study the region-to-region variation of metallicity in nearby galaxies to learn about how these important processes shape the heavy element content of galaxies. The PI will also lead a program of professional development and mentoring for incoming transfer students to the physical sciences at UC San Diego with the goal of increasing their participation in undergraduate research. The investigators will make the next critical step forward in measuring ISM metallicities in nearby galaxies using new integral field spectroscopic observations performed with the Keck Cosmic Web Imager (KCWI) and the Very Large Telescope Multi-Unit Spectroscopic Explorer (VLT-MUSE). These instruments will obtain high sensitivity, fully-sampled maps of the 3500-9300 Angstrom optical spectrum allowing detailed metallicity studies using temperature-sensitive auroral emission lines of oxygen, nitrogen and sulfur. Previous studies have been limited in their assessment of metallicity due the faintness of the spectral lines needed for accurate metallicity diagnostics. The investigators will use the KCWI and MUSE observations to study metallicity inhomogeneity as a function of galaxy properties such as morphology, specific star formation rate and presence of a stellar bar and they will compare these observations to predictions from galaxy simulations and theory. To broaden participation in science, the PI will lead a series of workshops for transfer students in the physical sciences at UC San Diego to provide training in research skills and guidance in finding research positions. The PI will also initiate organized data collection to track the career path of transfer students. This dataset will be used to assess the effectiveness of the program and develop further strategies for increasing the fraction of underrepresented minorities who pursue advanced degrees in the physical sciences.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.

随着恒星的发展，它们会产生和分配重元素（即比氦气重的元素）到星际气体中。 随着时间的流逝，沉重的元素含量在星系中积聚，增加了气体的金属性。 金属性在管理星系如何形成新恒星方面具有重要作用。由于星系周围环境中的气体流入以及由于恒星形成强烈爆发引起的星系盘的气体流出，因此金属性也会改变。一旦进入银河系，具有不同金属性的气体就会被湍流和流动混合在一起。 因此，银河系中的局部金属性反映了所有这些因素之间的竞争。 这些研究者将研究附近星系中金属性的区域对区域变化，以了解这些重要过程如何影响星系的重元素含量。 PI还将领导一项专业发展和指导计划，以向圣地亚哥分校的体育科学转学，以增加他们参与本科研究的目标。 研究人员将使用使用Keck Cosmic Web Imager（KCWI）和非常大的望远镜多单位光谱探索器（VLT-Muse）进行的新的积分田间光谱观测来实现附近星系中ISM金属的下一个关键一步。这些仪器将获得3500-9300 Angstrom光谱的高灵敏度，完全采样的地图，从而允许使用氧气，氮和硫的温度敏感的极光发射线进行详细的金属性研究。由于精确的金属诊断所需的光谱线的衰弱，先前的研究在评估金属性方面受到限制。研究人员将使用KCWI和MUSE观察结果来研究金属性不均匀性，这是星系特性的函数，例如形态学，特定的恒星形成率以及出色的棒状棒的存在，他们将将这些观察结果与星系模拟和理论的预测进行比较。为了扩大对科学的参与，PI将领导一系列的讲习班，为圣地亚哥分校的体育科学的转学学生提供一系列研讨会，以提供研究技能和指导的培训，以查找研究职位。 PI还将启动有组织的数据收集，以跟踪转学学生的职业道路。该数据集将用于评估该计划的有效性，并制定进一步的策略来增加代表性不足的少数群体的比例，这些少数群体在物理科学中攻读高级学位。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查审查的审查标准来通过评估来获得支持的。

项目成果

The DUVET Survey: Direct T e -based Metallicity Mapping of Metal-enriched Outflows and Metal-poor Inflows in Markarian 1486

DUVET 调查：马卡里安 1486 年富金属流出量和贫金属流入量的直接基于 T 的金属丰度测绘

• DOI: 10.3847/2041-8213/ac18ca
• 发表时间: 2021
• 期刊: The Astrophysical Journal Letters
• 作者: Cameron, Alex J.;Fisher, Deanne B.;McPherson, Daniel;Kacprzak, Glenn G.;Berg, Danielle A.;Bolatto, Alberto;Chisholm, John;Herrera-Camus, Rodrigo;Nielsen, Nikole M.;Reichardt Chu, Bronwyn
• 通讯作者: Reichardt Chu, Bronwyn

Keck Cosmic Web Imager Observations of He ii Emission in I Zw 18

凯克宇宙网络成像仪对 I Zw 18 中 He ii 发射的观测

• DOI: 10.3847/2041-8213/abf09b
• 发表时间: 2021
• 期刊: The Astrophysical Journal Letters
• 作者: Rickards Vaught, Ryan J.;Sandstrom, Karin M.;Hunt, Leslie K.
• 通讯作者: Hunt, Leslie K.

DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy

DUVET：通过星爆盘星系中的星系流出对恒星形成调节进行空间分辨观测

• DOI: 10.3847/1538-4357/aca1bd
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Reichardt Chu, Bronwyn;Fisher, Deanne B.;Bolatto, Alberto D.;Chisholm, John;Fielding, Drummond;Berg, Danielle;Cameron, Alex J.;Glazebrook, Karl;Herrera-Camus, Rodrigo;Kacprzak, Glenn G.
• 通讯作者: Kacprzak, Glenn G.

The 2D metallicity distribution and mixing scales of nearby galaxies

邻近星系的二维金属丰度分布和混合尺度

• DOI: 10.1093/mnras/stab3082
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Williams, Thomas G;Kreckel, Kathryn;Belfiore, Francesco;Groves, Brent;Sandstrom, Karin;Santoro, Francesco;Blanc, Guillermo A;Bigiel, Frank;Boquien, Médéric;Chevance, Mélanie
• 通讯作者: Chevance, Mélanie