Title: Spectroscopically Mapping Our Milky Way and Nearby Galaxies with AMASE

Speaker: 严人斌

Institute: 香港中文大学

Host: 王俊峰

Time: 2024.5.23 周四 14:30

Location: 物理楼 552

Abstract:

Feedback from star formation and supernovae is known to regulate the star formation in galaxies and re-distribute metals in and around galaxies. However, the subgrid physics is still not well understood. Current photoionization models of star-forming regions also have many inconsistencies with observations, which are further complicated by correlations in the spatial distribution of dust and that of emission line ratios. These make it difficult to achieve precision gas astrophysics. AMASE is a planned project to provide unprecedented data for tackling these issues. AMASE will have a hundred identical fiber-based integral fields spectrographs paired with an array of telephoto lenses to achieve contiguous imaging spectroscopy over 1/4 of the sky at the spatial resolution of half an arcminute and a spectral resolution of R=15,000, covering important emission lines in the optical for studying the ionized gas in the Milky Way and beyond. It will be enabled by a significant reduction in the cost of each spectrograph unit. Through massive replication, we can significantly exceed the survey speed of traditional spectrographs under similar total cost. The prototype system will include six spectrographs paired with 3 small telescopes, deployed at sites on both hemispheres. I will present the design and development progress.

Bio：

严人斌教授本科毕业于北京大学物理系，后赴美国留学获得加州大学伯克利分校博士学位。他曾在多伦多大学和纽约大学做博士后。2012年，他加入美国肯塔基大学任教，并于2018年获得终身教职。之后在普林斯顿大学作访问学者进行天文仪器研发，2021年，他回国加入了香港中文大学，并被授予“全球创科学人”的称号，建立赛马会天文仪器创科实验室并任主任。他的研究方向包括星际介质天体物理、星族合成及天文仪器研发。他在开展大型光谱巡天项目方面很有经验,曾任第四代斯隆数字巡天中MaNGA近邻星系积分视场巡天项目的项目科学家，该项目是迄今为止样本最大的星系积分场光谱巡天，提供了超过一万个星系的数据。他还领导了MaNGA恒星光谱库项目，这是迄今为止最大、最全面的恒星光谱库。最近，他开始了一个新的天文仪器研发，为下一代大天区面积的积分场光谱巡天建造仪器，计划打造能覆盖上万度天区的巡天项目。

References:

Yan et al. (2020)https://ui.adsabs.harvard.edu/abs/2020SPIE11447E..8YY/abstract

Ji & Yan (2020b) https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.5749J/abstract

Ji et al. (2023) https://ui.adsabs.harvard.edu/abs/2023A%26A...670A.125J/abstract