Comparing direct and IR fine-structure metallicity measurements

比较直接和红外精细结构金属丰度测量

• 批准号: ST/M008002/1
• 负责人: Roberto Maiolino
• 金额: $ 0.12万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FM008002%2F1
• 关键词: Comparing; direct; IR; fine; structure

Understanding the processes regulating the heavy element content ('metallicity') of galaxies is one of the most important problems in astrophysics. Many studies in recent years have had great success in developing our understanding of metallicity, both in the local Universe and at high redshift. These studies have resulted in a great advance in our knowledge of the physics underlying galaxy evolution. It is, however, critical to note that essentially all of these findings were conducted using optical light, and are therefore likely to be strongly biased. Optical lines are poor probes of highly dusty regions: optical metallicity tracers can therefore fail to probe the very regions which are driving galaxy evolution. We are contacting a matched study, comparing metallicity relations derived both in the optical and the infra-red for a sample of dusty galaxies. These galaxies have existing Herschel far-IR spectroscopy (and far-IR-derived metallicities), which are minimally affected by dust. This observing trip is undertaken in order to conduct a program of optical spectroscopy to derive 'direct' optical metallicities for this sample, to enable a comparison between metallicities derived using traditional optical methods, and IR line methods.

了解星系中重元素含量（“金属丰度”）的调节过程是天体物理学中最重要的问题之一。近年来的许多研究在发展我们对金属丰度的理解方面取得了巨大的成功，无论是在本地宇宙还是在高红移。这些研究使我们对星系演化背后的物理学知识有了很大的进步。然而，重要的是要注意，基本上所有这些发现都是使用光学进行的，因此可能存在很大的偏见。光学谱线是探测高尘埃区域的拙劣探针：因此，光学金属丰度示踪剂无法探测驱动星系演化的区域。我们正在联系一个匹配的研究，比较金属丰度的关系，从光学和红外的尘埃星系样本。这些星系具有赫歇尔远红外光谱（和远红外衍生的金属丰度），受尘埃的影响最小。进行这次观察旅行是为了进行光谱学计划，以获得该样品的“直接”光学金属度，从而能够比较使用传统光学方法和红外线方法获得的金属度。

项目成果

Molecular gas as the driver of fundamental galactic relations

• DOI: 10.1093/mnras/stv2121
• 发表时间: 2015-07
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: M. Bothwell;R. Maiolino;Yingjie Peng;C. Cicone;H. Griffith;J. Wagg

Mapping metals at high redshift with far-infrared lines

用远红外线绘制高红移金属图

• DOI: 10.1093/mnras/stv1788
• 发表时间: 2015
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Pallottini A