首页

2025.05.15

A Possible Metal-dominated Atmosphere below the Thick Aerosols of GJ 1214 b Suggested by Its JWST Panchromatic Transmission Spectrum

<p>GJ1214b is the archetype low-density sub-Neptune orbiting around a M-dwarf. The bulk composition of GJ1214b is of great interest to explore its origin; however, previous studies suffered from a degeneracy between a rocky core with a hydrogen-rich envelope or an icy core with a water-rich envelope. To break the degeneracy, atmospheric observations had been conducted for over a decade; however, t...</p>

2025.05.08

New Insights into Exoplanets: Connecting Theory with Measurements from Space and Lab

<p>The discovery of thousands of exoplanets in our galaxy has unveiled an extraordinary diversity in planetary compositions and properties, challenging conventional theories of planet formation and evolution. These observations have spurred the development of new theoretical models that incorporate additional physical processes to bridge the gap between theory and data. Informed by recent high-pre...</p>

2025.05.07

Metallicity Correlations in Galaxies

<p>Integrated field unit (IFU) spectroscopy provides a unique window to explore gas-phase oxygen abundances in the interstellar medium (ISM) of galaxies in the local Universe. Two-point correlations are one of the next-generation methodologies proposed to extract new information on ISM diffusion from metal fields inside galaxies. I will present two-point correlation analyses using CALIFA and MUSE ...</p>

2025.04.28

eROSITA Survey of the Hot Gaseous Halo of the Member Galaxies in Virgo

<p>The X-ray-emitting hot gas is one of the primary components of the X-ray emission in normal galaxies and is crucial for understanding the evolution of the galactic ecosystem. The Virgo Cluster is the nearest and a rich galaxy cluster at its early evolutionary stage, which offers a great opportunity to study the hot gas content of its member galaxies and the cluster environmental effects. In thi...</p>

2025.04.24

Active galactic nuclei and mergers in IR-bright galaxies

<p>The interaction of galaxies is known to regulate the star-formation activities in the merging systems, or galaxy pairs, however, whether and how such interactions affect the central supermassive black hole, often manifested as active galactic nuclei---AGNs, is still under debate. Controversies exist as to whether AGN activities are enhanced or suppressed during the different merging phases. The...</p>

2025.04.22

Shedding light on the particle nature of dark matter

<p>Several astrophysical and cosmological phenomena are consistent with the existence of a non-luminous, non-interacting “Dark Matter.” In this talk I describe efforts to detect Cold Dark Matter with particle experiments and the current limits. I then give an overview of the astrophysical constraints on Warm, Self-Interacting, and Fuzzy Dark Matter and a future outlook on Dark Matter searches.BI...</p>

2025.04.21

Clustering analysis on 4MOST Cosmology Redshift survey

<p>This presentation is divided into three main parts:Overview of Large-Scale Structure (LSS) Studies in CosmologyThis section introduces the theoretical framework behind the formation and evolution of large-scale structure, observations on LSS, statistical techniques used for LSS data analysis, and key phenomena (BAO, RSD and AP effect) associated with LSS.Introduction to 4MOST and the Cosmologic...</p>

2025.04.17

Wave dark matter

<p>We will discuss the possibility that dark matter is composed of sufficiently light particles (such as axions) that it effectively behaves as a collection of waves. We will review the particle physics motivations and the&nbsp;rich wave phenomenology, and discuss the implications for astronomical observations and experimental detection.BIOHui Lam got his PhD from&nbsp;Massachusetts Institute of Technology....</p>

2025.04.16

基于宇宙微波背景与射电观测的宇宙学研究

<p>通过联合宇宙微波背景和射电波段的观测可以揭示宇宙从早期到晚期不同阶段的演化历史。未来对宇宙微波背景偏振信号的高精度测量，将有助于探测由主要扰动及次级效应产生的新偏振信号，为早期宇宙物理机制及大尺度结构的形成与演化提供重要观测依据。同时，中性氢21厘米线信号可在不同红移和空间尺度上追踪暗物质主导的大尺度结构，为暗物质和暗能量的研究提供重要线索。宇宙微波背景与21厘米线信号在时间和空间尺度上的互补性，...</p>

2025.04.10

拉索发现黑洞是PeV宇宙线加速器

<p>拉索在银河系内发现了许多“拍电子伏加速器(PaVetron)”，其中的一部分以第一个黑洞PaVetron源表的形式发表，清楚显示出一个新的宇宙线源的“类”。最引人瞩目的是存在一个“超级-PaVetron”。还发现了一个近乎完美的黑洞+喷流的系统，让人类能够细致的研究黑洞吸积盘、喷流的产生等基本的物理问题。更重要的是我们发现，大约10个左右的源，将足以提供宇宙线“膝”及其以上的宇宙线的流量。拉索刚刚发表了质子在膝附近的能谱，...</p>