Travel support for two observers to conduct astronomical observations at the LBT during in September/October 2018

为两名观察员于 2018 年 9 月/10 月期间在 LBT 进行天文观测提供差旅费

• 批准号: 418766299
• 负责人: Privatdozent Dr. Dominik Bomans
• 金额: --
• 依托单位: Lehrstuhl für Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/418766299?language=en
• 关键词: Travel; support; two; observers; conduct

1) The observation of nebular CIII] and CIV emission lines in z~7 galaxies triggered new interest in the nature of the hard radiation field needed for this emission lines to occur. Since not only very massive, low metallicity stars, but also massive X-ray binaries,accreting supermassive black hole, and even shocks may be possible sources of the hard continuum photons, the definition of a set of very local proxies is imperative, where spatial resolution and sensitivity allow a detailed study of the gas and individual ionization sources. 2) The ionization process of outflows and diffuse ionized gas halos in disk galaxies is still an unsolved puzzle. While a connection to star formation activity seems to be well established (but not fully understood), the ionization mechanism of the observed ionized gas is not well constrained: while photo-ionization certainly contributes, the observed line ratios and their change with distance from the disk require changes in the photon field and the presence of an additional currently unknown heating mechanism. 3) Spitzer and also HERSCHEL revealed a significant number of small bubbles in the Milky Way. In a couple of cases, it was possible to take optical spectra of the apparent central stars, which surprisingly often turned out to be evolved massive stars (Wolf-Rayet stars, candidates for Luminous Blue Variables, and OB supergiants). We target the bubbles and their central stars with LUCI NIR spectroscopy to classify the potentially highly absorbed part of the bubbles and investigate their evolutionary state and their central stars in a more unbiased way.

1) z~7星系中星云CIII]和CIV发射线的观测引发了人们对这种发射线发生所需的硬辐射场性质的新兴趣。由于不仅质量非常大、金属丰度较低的恒星，而且质量巨大的 X 射线双星、吸积的超大质量黑洞，甚至冲击波都可能是硬连续谱光子的来源，因此必须定义一组非常局部的代理，其中空间分辨率和灵敏度允许对气体和单个电离源进行详细研究。 2）盘状星系中流出物和扩散电离气晕的电离过程仍然是一个未解之谜。虽然与恒星形成活动的联系似乎已经建立（但尚未完全理解），但观察到的电离气体的电离机制并没有得到很好的约束：虽然光电离肯定有所贡献，但观察到的线比及其随距恒星距离的变化圆盘需要光子场的变化以及额外的目前未知的加热机制的存在。 3）斯皮策和赫歇尔揭示了银河系中大量的小气泡。在一些情况下，可以获取明显中心恒星的光谱，令人惊讶的是，这些恒星常常被证明是演化的大质量恒星（沃尔夫-拉叶星、发光蓝变星的候选星和OB超巨星）。我们使用 LUCI 近红外光谱仪瞄准气泡及其中心恒星，对气泡中潜在的高度吸收部分进行分类，并以更公正的方式研究其演化状态及其中心恒星。