Collaborative Research: Beyond O/H: Fundamental Astrophysics with HII Region Abundances

合作研究：超越 O/H：具有 HII 区域丰度的基础天体物理学

• 批准号: 1715284
• 负责人: Richard Pogge
• 金额: $ 43.32万
• 依托单位: Ohio State University
• 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: 2017-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715284&HistoricalAwards=false
• 关键词: Collaborative; Research; Beyond; Fundamental; Astrophysics

Galaxies contain gas and stars. The chemicals in the gas leave fingerprints in the form of emission lines. The chemical abundances can be measured by studying the emission lines. These studies show trends between the abundances and the stellar mass of a galaxy. They also show trends in the abundances between the inner and outer regions of a galaxy. Such trends carry important clues about how galaxies form and evolve. But the clues are muddled because the absolute scales for the trends are uncertain. To make progress, the team will observe galaxies at optical wavelengths with the Large Binocular Telescope. They will use a new, NSF-enabled instrument to study the galaxies' emission lines. The team will then analyze the emission lines to determine absolute abundances. Senior team members will train junior team members. The team will partner with the State Parks of Minnesota to give public talks in novel settings. They will also use a planetarium to reach K-12 students in low-income areas of Ohio.The team will analyze cutting-edge emission line spectra of HII regions in 13 spiral galaxies. Their goals are to (1) solve the decades-old discrepancy between abundances based on collisionally-excited forbidden lines and those based on optical recombination lines, (2) conduct a definitive study the abundance gradients in spiral galaxies, and (3) design a calibration of strong-line abundances appropriate to both unresolved global spectra and spatially-resolved spectra from the next generation of surveys with integral field units.

星系包含气体和恒星。气体中的化学物质会以发射线的形式留下指纹。化学丰度可以通过研究发射谱线来测量。这些研究显示了一个星系的丰度和恒星质量之间的趋势。它们还显示了星系内部和外部区域之间的丰度趋势。这种趋势为星系的形成和演化提供了重要线索。但是这些线索是混乱的，因为趋势的绝对规模是不确定的。为了取得进展，研究小组将用大型双筒望远镜在光学波长上观察星系。他们将使用一种新的nsf支持的仪器来研究星系的发射线。然后，该团队将分析发射线以确定绝对丰度。高级团队成员将培训初级团队成员。该团队将与明尼苏达州州立公园合作，在新颖的环境中进行公开演讲。他们还将利用天文馆向俄亥俄州低收入地区的K-12学生提供服务。该团队将分析13个螺旋星系中HII区域的尖端发射谱线。他们的目标是：(1)解决几十年来基于碰撞激发禁线的丰度与基于光学复合线的丰度之间的差异；(2)对螺旋星系的丰度梯度进行明确的研究；(3)设计一种适合于未解析全局光谱和空间解析光谱的强线丰度校准，这些光谱来自下一代的积分场单位巡天。

项目成果

CHAOS. VI. Direct Abundances in NGC 2403

• DOI: 10.3847/1538-4357/abf8b9
• 发表时间: 2021-05
• 期刊: The Astrophysical Journal
• 作者: N. Rogers;E. Skillman;R. Pogge;D. Berg;J. Moustakas;K. Croxall;Jiayi Sun

CHAOS IV: Gas-phase Abundance Trends from the First Four CHAOS Galaxies

CHAOS IV：前四个混沌星系的气相丰度趋势

• DOI: 10.3847/1538-4357/ab7eab
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Berg, Danielle A.;Pogge, Richard W.;Skillman, Evan D.;Croxall, Kevin V.;Moustakas, John;Rogers, Noah S.;Sun, Jiayi
• 通讯作者: Sun, Jiayi

CHAOS V: Recombination Line Carbon Abundances in M 101

CHAOS V：M 101 中的重组线碳丰度

• DOI: 10.3847/1538-4357/ab86ae
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Skillman, Evan D.;Berg, Danielle A.;Pogge, Richard W.;Moustakas, John;Rogers, Noah S.;Croxall, Kevin V.
• 通讯作者: Croxall, Kevin V.