USTC Astronomy Colloquium Series: 2025 Spring
Weighing galaxies with strong gravitational lensing
Alessandro Sonnenfeld 研究员
上海交通大学
2025/05/13, 4:00pm , the 19th-floor Observatory Hall

报告人:
Alessandro Sonnenfeld: 2015年毕业于美国加州大学圣巴巴拉分校,博士学位。随后分别在日本东京大学,荷兰莱顿大学从事博士后研究工作,2020年海外人才引进中国,现为上海交通大学副教授、博士研究生导师,主要研究方向为利用引力透镜探测星系周围暗物质分布。曾获得日本KAKENHI,以及JSPS等科研资助。目前发表文章124篇,总引用7000余次,其中一作/通讯文章22篇,h-high index 37.摘要:
We are living in a golden age of extragalactic astronomy: observations over broad wavelength ranges, wide fields and unprecedented depth are allowing us to uncover important details on the formation and evolution of galaxies. Yet, key quantitative aspects on the properties of galaxies remain not well constrained. The most important such aspects are the stellar mass, the star formation efficiency (how much of the initial reservoir of gass is turned into stars), and the dark matter distribution of galaxies. Lack of precise knowledge on these quantities is limiting our progress in both galaxy evolution and cosmology. Gravitational lensing is one of the most reliable tools to measure galaxy masses at cosmological distances, and therefore offers a solution to this problem. Ongoing and upcoming missions such as Euclid and the Chinese Space Station Telescope (CSST) will enable the discovery of tens of thousands of strong lenses, opening up the era of statistical strong lensing. I will discuss the opportunities that statistical strong lensing will bring for our understanding of galaxies, as well as the challenges associated with it.