

报告讲座
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格物致理第96期:暗物质间接探测及甚大面积伽马射线空间望远镜
暗物质的物理本质属性是国际重大科学前沿。一种常用的研究手段是间接探测,就是在伽马射线和宇宙线数据中去证认暗物质湮灭或衰变的产物。我将介绍悟空号卫星项目以及国内外试验在暗物质间接探测方面所发现的部分候选信号,最后将介绍紫金山天文台等单位正在协同推进的甚大面积伽马射线空间望远镜计划。
发布者: 发布时间:2025-07-26 15:06:24 -
格物致理第95期:The frontiers of Circum-Galactic Mediums
Circum-Galactic Medium (CGMs) are multi-phases, key to understand the galaxy ecosystem and its accretion and feedback. Mapping the circumgalactic medium (CGM) in emission is one of the important scientific goals for astronomers to either use the modern ground-based telescopes or the future space missions. In this talk, I will overview the frontiers of CGMs, emphasizing the warm-hot phase, which is believed to be the baryons reservoir of the missing baryons. I also overview the related observation strategies in the world as well as some explorations in China. I I will highlight the prospects in CGM fields based on the existing and future facilities (such as SMILE, CSST, CAFÉ, HUBS etc.) in China.
发布者: 发布时间:2025-07-26 14:52:08 -
格物致理86期:Particle-In-Cell Simulation on Astrophysical Plasmas
Particle-In-Cell (PIC) simulation is a powerful tool to study plasma kinetics. In this talk, I will show applying PIC method on the problems of astrophysical plasmas.
发布者: 发布时间:2025-05-22 09:23:58 -
格物致理83期:双中子星并合的磁流体模拟
双中子星并合是多信使天文的重要观测对象,而从第一性原理出发模拟其演化过程,对于解读多种观测数据是不可或缺的。其中,磁场的作用尤为关键——尽管双星并合之前的初始磁场可能较弱,但在并合过程中,各种放大机制会显著增强磁场,最终主导系统的演化,并驱动伽马射线暴、磁星风等一系列现象。本报告将从磁流体力学与数值相对论的基础出发,介绍基于第一性原理的双中子星并合模拟,解读双中子星并合过程中磁场增强的多种物理机制。报告还将探讨双星并合产生的磁星中帕克不稳定性所引发的耀变活动,以及准直喷流的形成机制。
发布者: 发布时间:2025-04-14 20:31:24 -
格物致理85期:极高能宇宙线的起源和GRAND项目
宇宙线的发现已有百年的历史,但它的起源问题一直未解决。极高能(十的十八次方电子伏特)宇宙线和中微子的观测研究是解答 “极高能宇宙射线起源” 这一世纪难题的重要手段。目前,利用低频射电阵列探测极高能粒子的簇射过程是该领域的研究热点。本报告将介绍极高能宇宙线和中微子领域的相关研究进展,未来实验设施,基于大型中微子射电探测阵列GRAND实验介绍低频射电阵列探测高能粒子的基本原理和发展现状。
发布者: 发布时间:2025-04-14 20:28:37 -
格物致理84期:Toward Unveiling the Origins of the Milky Way Bulge through Multi-band-Messenger Sky Surveys
The Galactic bulge hosts multiple stellar populations with distinct structural, kinematic, and chemical properties, reflecting the complex dynamical processes that shaped its formation. It is also a key region for many high-energy radiation sources. In this project, we analyze the structure, kinematics, and chemo-dynamical properties of the bulge using RR Lyrae stars from OGLE and giant stars from APOGEE and Gaia, selected based on their distances placing them in the inner Galaxy.
发布者: 发布时间:2025-04-14 20:23:03