2024年11月14日，周四15:30-17:00紫金港西区海纳苑8幢324New Frontiers of Dark Matter Halo (暗物质晕的新前沿）韩家信（上海交通大学）Abstract：Current theoretical understandings of the nonlinear structure formation and galaxy formation processes are largely built upon a central concept that dark matter in the Universe are mostly contained in virialized clumps called dark matter halos, with the boundary of a halo described by its virial radius. However, the growth of a halo means it is inevitably surrounded by a non-virialized envelope of freshly accreted material. Failing to account for this envelo...

2024年11月7日， 周四15:30-17:00紫金港西区海纳苑8幢324Science capability and selected early results of the Einstein Probe mission 袁为民（国家天文台）Abstract：Launched on January 9th, 2024, the Einstein Probe (EP) is a space X-ray observatory designed to detect mainly high-energy transient and variable sources in the universe. It aims at detecting such sources at unprecedented sensitivity and spatial resolution in the soft X-ray band and performing quick onboard follow-up observations in X-rays. EP carries two instruments, a wide-field X-ray telescope (WXT) to monitor the soft X-ray sky in 0.5...

2024年10月24日， 周四15:30-17:00紫金港西区海纳苑8幢324Searching for “Lonely” Dark Objects with Microlensing东苏勃（北京大学）Abstract：Galactic microlensing is the only known method to discover dark objects ranging from isolated stellar-mass black holes (BHs) down to Earth-mass free-floating planets (FFPs). The recent success of interferometric resolution of microlensed images with VLTI opens up a new venue for discovering isolated stellar remnants. I discuss how the VLTI-GRAVITY(+) instrument can significantly advance such discoveries, potentially leading to measuring the mass function of i...

2024年10月16日， 周三15:30-17:00紫金港西区海纳苑8幢324Hyper-Millennium project: a hyper cosmological simulation for the next generation of large-scale structure survey郭琦（国家天文台）Abstract：Dark matter and dark energy are among the most important cutting-edge sciences. Extensive global efforts have been dedicated to the large-scale structure evolution through projects like LSST, DESI, Euclid, PFS, and the Chinese space station optical survey. We have successfully completed a N-body cosmological simulation that traces 4 trillion particles from redshift 100 to the present day within a 2.5 G...

2024年10月10日， 周四15:30-17:00紫金港西区海纳苑8幢324Multiphysics, Hetrogeneous, and Performance: The Incoming Step of Astrophysical Simulations王力乐（北京大学）Abstract：The new era of astronomy observation desires numerical simulations with unprecedented spatial resolution and inclusion for multiphysics. This presentation introduces KRATOS, a state-of-the-art high-performance heterogeneous simulation system developed by the speaker. KRATOS is distinguished by its meticulously crafted one-sided coupling mechanism that integrates seamlessly with geometrical and physical modules, culminating ...

2024年10月10日， 周四14:00-15:30紫金港西区海纳苑8幢324A Dynamic View of Galaxy Clusters – From the Cores to the Outskirts张从尧 (University of Chicago)Abstract：Galaxy clusters, as massive, virialized halos within the cosmic web, serve as ideal laboratories for advancing our understanding of cosmology, plasma physics, and the nature of dark matter. The study of their formation and evolution stands as one of the frontiers of modern astrophysics. In this talk, I will cover several key topics in cluster studies, from the activities of supermassive black holes at cluster centers to accretion and v...

2024年9月27日， 周五15:30-17:00紫金港西区海纳苑8幢324Rotating convective motions in rapidly rotating planetary fluid: conduction state, thermal instability, and transition to turbulence孔大力 (上海天文台)Abstract：The problem of thermal convection in rapidly rotating, self-gravitating fluid bodies has been widely modeled in spheres or spherical shells, which implicitly neglects the flattening effect due to the centrifugal force. However, the fast rotation of gaseous giant planets and some of Be stars makes them bulge out enough that they can’t be treated as spheres. As a result, investigating...

Volker SpringelMax Planck Institute for AstrophysicsTitle: Supercomputer Simulations of the UniverseTime: 15:30-17:00, April 12Location: Room 215, N. 8 Hainayuan Building

4月8日， 周一15:30-17:00紫金港西区海纳苑8幢324Elemental abundances of hot plasmas in individual galaxies and galaxy assembliesAbstract：Hot plasmas in individual galaxies and galaxy assemblies are enriched with metals because metal lines stand out above the continuum in the observed X-ray spectra. The observed elemental abundances encode the chemical enrichment processes of the hot plasmas. Dying stars (AGB stars, core-collapse, and type Ia supernovae) are the main cosmic metal factories. Various processes (e.g., AGN feedback, ram pressure) can redistribute metals. By accuratly measure element...

3月28日， 周四15:30-17:00紫金港西区海纳苑8幢324Abstract：活动星系核中心的超大质量黑洞通过吸积盘吞噬气体释放巨量能量，是宇宙中持续亮度最高的一类天体。天文学家普遍相信，活动星系核的辐射主要产生于黑洞周围的吸积盘和一个高温X射线冕区，然而，虽然经历了数十年的研究，人们对吸积盘和冕区关键物理过程的认识仍十分贫乏。我将分享在这个领域我们近年来的一些观测研究进展，包括发现类星体吸积盘的紫外能谱与光度无关，显著偏离经典吸积盘理论的预言；发现吸积盘与X射线冕区的物理关联；以及发现X射线辐射能谱和光变的一些新线索和新规律。王俊贤，2001年获中国科学技术大学天体物理博士学位2001年7月-2004年6月在约翰.霍普金斯大学做博...