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.

了解调节星系重元素含量（“金属丰度”）的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加深我们对局部宇宙和高红移金属丰度的理解方面取得了巨大成功。这些研究使我们对星系演化背后的物理知识有了很大的进步。然而，值得注意的是，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。光学线对于高尘埃区域的探测效果不佳：因此，光学金属丰度示踪剂无法探测驱动星系演化的区域。我们正在联系一项匹配的研究，比较尘埃星系样本的光学和红外衍生的金属丰度关系。这些星系具有现有的赫歇尔远红外光谱（以及远红外衍生的金属丰度），受尘埃的影响最小。这次观察之旅的目的是执行光谱学程序，以得出该样品的“直接”光学金属丰度，从而能够对使用传统光学方法和红外线方法得出的金属丰度进行比较。

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