Investigating galaxy formation and evolution at sub-millemetre to millimetre wavelengths with Herschel and Muscat

与赫歇尔和马斯喀特一起研究亚毫米到毫米波长的星系形成和演化

• 批准号: 1938557
• 金额: --
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1938557
• 关键词: Investigating; galaxy; formation; evolution; sub

Observations carried out at far-infrared to sub-millimetre/millimetre wavelengths are of paramount importance to understand the formation and evolution of galaxies. In fact, most of the star formation activity in the universe occurred during a dust-obscured phase, in which the UV/optical light from newly born stars was absorbed by dust and re-emitted at far-IR/sub-mm/mm wavelengths.Recently, the Herschel Space Observatory has explored the universe at those wavelengths with unprecedented sensitivity and resolution, providing a catalogue of hundreds of thousands of dust-obscured galaxies to be used for detailed statistical studies. By leading the widest-area extragalactic survey ever conducted with Herschel, i.e. the Herschel-ATLAS, the Cardiff University is at the forefront in the analysis and scientific exploitation of this large sample of dust-obscured galaxies. Furthermore, a new large format millimetre camera, the Mexico-UK Sub-millimetre Camera for Astronomy (MUSCAT), is currently under construction here in Cardiff and, once installed on the Large Millimetre Telescope (LMT) in Mexico in early 2018, it will carry out observations of some of the extragalactic fields covered by Herschel-ATLAS, thus providing new higher resolution data at millimetre wavelengths.The student will take part in the scientific exploitation of the Herschel-ATLAS and MUSCAT data. He will develop a physical model to interpret the measured statistical properties of dust-obscured galaxies by solving the basic equations for the evolution of the gas within dark matter halos identified in N-body simulations and implementing realistic spectral energy distributions to convert the output of the equations into observables, eg flux densities. The student will also work on the final stages of the characterisation of MUSCAT before it is installed on the LMT. Once the camera is installed, he will assist in the commissioning of MUSCAT and readying the instrument for astronomical observations. He will then help with the data taking/analysis.

在远红外线至亚毫米/毫米波长进行的观测对了解星系的形成和演变至关重要。事实上，宇宙中大多数星星形成活动都发生在尘埃遮蔽阶段，在这一阶段，新生恒星发出的紫外/可见光被尘埃吸收，并以远红外/亚毫米/毫米波长重新发射出来。最近，赫歇尔空间天文台以前所未有的灵敏度和分辨率在这些波长上对宇宙进行了探索，提供了数十万个尘埃遮蔽星系的目录，用于详细的统计研究。通过领导有史以来与赫歇尔进行的最大面积的河外调查，即赫歇尔-阿特拉斯，卡迪夫大学是在分析和科学利用这个大样本的尘埃遮蔽星系的最前沿。此外，一台新型大画幅毫米相机--墨西哥-英国亚毫米天文相机（麝香）目前正在卡迪夫建造，一旦于2018年初安装在墨西哥的大型毫米望远镜（LMT）上，它将对赫歇尔-阿特拉斯覆盖的一些河外磁场进行观测，该学生将参与赫歇尔-阿特拉斯和麝香数据的科学利用。他将开发一个物理模型，通过求解N体模拟中确定的暗物质晕内气体演化的基本方程，并实现现实的光谱能量分布，将方程的输出转换为可观测量，例如通量密度，来解释尘埃遮蔽星系的测量统计特性。学生还将在安装在LMT上之前对麝香进行最后阶段的表征。一旦照相机安装完毕，他将协助麝香的试运行，并为天文观测做好准备。然后，他将帮助进行数据采集/分析。