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2026 01.09

天文研究所报告[145] 基于大规模巡天项目的银晕研究

薛香香 (中科院国家天文台)报告摘要:作为我们的家园星系，银河系的结构、形成与演化一直是研究热点。尽管银河系中的晕族恒星只占银河系中所有恒星的一小部分，但是它们对研究银河系的暗物质晕和形成历史至关重要。在这里，不仅保留着大量吸积并合的遗迹—潮汐子结构，而且分布在遥远银晕中的恒星最有利于精确测量银晕的暗物质质量分布。随着大视场光谱巡天（如SDSS和LAMOST）的出现，有光谱观测的晕星越来越多，这些晕星的三维位置、视向速度以及金属丰度大大推进了人们对银河系晕的认识。2018年，Gaia卫星释放了高精度自行，结合光谱巡天，可以获得这些晕星的六维相空间参数，开启了银晕研究的新时代。本次报告将着重介绍基于LAMOST和Gaia在银晕研究中取得的突破性成果，如精细刻画银晕中的潮汐子结构和速度椭球，结合化学动力学揭示潮汐子结构的前身星系的恒星形成历史及运动学特征，可靠测量银河系暗物质质量分布等。个人简介: 薛香香现任中国科学院国家天文台研究员。曾入选洪堡学者和国家海外高层次人才项目。长期利用大规模巡天项目的晕族恒星数据研究银河系晕的动力学、结构和形成历史。发表SCI论文70余篇，引用2900余次，
2026 01.09

天文研究所报告[144] Forming the Biggest and the Smallest in the Early Universe: Galaxy-Halo Connections from ΛCDM to SIDM

姜方周 (北京大学)Abstract:Recent observations with JWST have unveiled two surprising populations in the early Universe: giant bulgeless disk galaxies (GBDs), which challenge popular theories of galactic disk formation; and little red cots (LRDs), compact, galaxy-less AGN likely powered by massive black holes. in this talk, l will present two complementary investigations that aim to explain these extreme systems within the context of their host dark-matter halos. First, using ΛCDM cosmological simulatio
2025 12.31

天文研究所报告[143] Deciphering the Galaxy-Environment Connection from Special Cosmic Labs: JWST Studies of a Gas-rich Cosmic Web Node at z>3

王炜辰 (University of Milano-Bicocca)2026年1月8日，周四14:00-15:15紫金港西区海纳苑8幢324Abstract:The majority of galaxies in the Universe are known to form and evolve in the filamentary large-scale structures named the Cosmic Web. In the early epochs, the Cosmic Web also hosts a plethora of gas flows and massive black holes, especially around the web nodes. Yet it remains a mystery how environments as such have shaped the very early phase of galaxy formation.To address this question, I would like to present a st
2025 12.31

天文所学术报告[142] 中国的时间

刘茜 (北京天文馆)2026年1月6日，周二14:00-15:30紫金港西区海纳苑8幢324腾讯会议：508-876-140摘要：在漫长的时间长河里，中国人如何确定自己在时间中的位置，又如何将自己安放于时间中？从观象授时到推步制历，从立木为表的观察到天文钟的诞生，天体的运行为人间提供了秩序，也成为中国古代社会秩序的深层根源。传统历法将太阳和月亮的运行巧妙纳为一体，阳历的部分指导农耕，阴历的部分则与生活节律相连。中国人“顺天应时”的传统将自己的生活实践纳入时间的框架，天体的运行又将时间与空间紧密联结，这种中国人独有的时间观与时空观在深层次上影响了我们的文化传统，至今仍在我们的生活中留下痕迹。报告人简介: 北京天文馆研究员，科普作家和科学电影撰稿人，《天文爱好者》杂志编委有多种科普图书、影片和音视频课程作品。作品曾获北京市科学技术奖、科教影视“中国龙奖”“科蕾奖”、吴大猷科普著作奖、中国科普作协优秀科普作品奖、科技部全国优秀科普作品等奖项。
2025 12.30

天文所学术报告[141] Uncovering dark matter distributions: from the Milky Way to nearby galaxies

朱玲 (上海天文台)Abstract:Dark matter distribution in galaxies is a key to test the cold dark matter (CDM) and galaxy formation models. We measure the dark-matter mass distribution for a representative sample of 140 nearby galaxies by combining IFU data from MaNGA and HI spectra from FAST. We find strong evidence that these galaxies exhibit a lower dark-matter fraction in their inner regions than predicted by cosmological simulations in the framework of CDM. Compared to these simulations, our galaxies
2025 12.30

天文所学术报告[140] Formation of habitable planets

Abstract:I will give an overview of theoretical models of planet formation with particular emphasis on the formation of habitable planets. Planets form in protoplanetary discs of gas and dust that orbit around young stars. Observations with ALMA and VLA constrain well the initial budget of the planetary building material. Experiments show that the growth of dust aggregates stalls at pebble sizes due to fragmenting collisions. Luckily, these pebbles drive both the formation of planetesimals by th
2025 12.30

天文所学术报告[139] JWST Observations of Gas Giants Across Planetary System Evolution

周一凡 (University of Virginia)Abstract:The James Webb Space Telescope is transforming our understanding of exoplanet origins and physical properties. High-quality JWST observations provide unprecedented constraints on gas giant atmospheres and formation processes. I will present results from our observational programs targeting gas giants across diverse evolutionary stages. Our sample spans actively forming protoplanets in young systems to mature planets orbiting white dwarf stars. These observati

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