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2025.03.21

Revealing the nature of IRAC Optical Dropouts in the Deep HSC fields [EN]

<p>Using the data from the Spitzer Space Telescope in the Deep HSC fields, we have found a mysterious population of objects that are detected at SNR&gt;5 in the 3-5 micron (IRAC ch1 and ch2) but are either very red with Y-ch1&gt;3.5 or totally invisible in the much deeper optical. Their median magnitudes are 23.95 and 23.68 AB in ch1 and ch2, respectively; 6% of the objects are also detected in IRAC ch3...</p>

2025.03.13

Binary around a BIG black hole v.s. Star around a BIG binary [EN]

<p>The detections of gravitational waves (GWs) from merging binary black holes (BHs) have motivated extensive research on the dynamical formation of such compact black hole binaries (BHBs). Recent studies have highlighted the potential role of tertiary-induced mergers via von Zeipel-Lidov-Kozai (ZLK) oscillations in generating the BHBs detected by collaborations like LIGO/VIRGO/KAGRA. I will discu...</p>

2025.03.14

Expect the unexpected – Augmented astrophysical models for black hole population studies

<p>GW observations are now revealing the population of black holes via the detection of binary black hole mergers, and the numbers are set to grow rapidly in the coming years: the distribution of astrophysical properties of binary black holes provides a key to interpret their formation channels. In this regard, scientists have proposed a variety of models for the black hole distribution, broadly c...</p>

2025.03.06

The progress of the SVOM Mission [EN]

<p>SVOM (Space-based multiband Variable Object Monitor) is a Chinese-French space mission mainly designed to study Gamma-Ray Bursts. The satellite has four instruments to detect and localize the prompt GRB emission and measure the evolution of the afterglow in the visible band and in soft X-rays, and a VHF communication system enabling the fast transmission of SVOM alerts to the ground. The ground...</p>

2025.03.07

Turbulent HI Gas Driven by the SN Bubbles [EN]

<p>The interstellar medium (ISM) is turbulent, and the energy sources driving this turbulence, particularly in HI gas, remain uncertain. Recently, stellar feedback, especially from supernovae (SNe), has been proposed as a potential mechanism for energy injection into the ISM. However, the specific processes involved are still unclear and require observational evidence. Using deep HI datacubes from...</p>

2025.02.27

Probing Active Galactic Nuclei with unprecedented precision — insights from VLTI/GRAVITY(+)

<p>The inner structures of active galactic nuclei (AGNs) are essential for probing the fundamental parameters of the central supermassive black hole (BH), understanding accretion physics, and investigating the physical connection between the BH and its host galaxy. The reverberation mapping (RM) technique has been widely used to study the broad-line region (BLR), the dust torus, and the accretion ...</p>

2025.02.28

First Euclid High-z Quasars In the Wide Survey

<p>Luminous high-z quasars provide direct probes of the buildup of supermassive black holes, the primeval massive galaxies hosting them, and the intergalactic medium during the epoch of reionization. Despite its extraordinary capabilities, a significant challenge remains: the lack of quasar samples at redshift larger than 7. The Euclid space telescope offers a promising avenue to enrich our quasar...</p>

2025.02.20

What is left for astronomers to do in the era of Artificial Intelligence?

<p>In this area of rapid development of AI, astronomers&#39; work is also evolving. What should we focus in training our students and our computers? In this talk I will present some of my thoughts on the subject and hope the audience will share in the discussion.BIOCharling Tao is an Emerita Director of Research in CNRS CPPM (Centre de Physique de Particules de Marseille) where she co-created the cosm...</p>

2025.03.06

Galaxy quenching from the perspective of semi-analytic model GAEA [EN]

<p>Galaxy quenching is a crucial phase of galaxy evolution. For years the over-quenching problem has posed a big challenge to galaxy evolution models at low redshift. In this talk, I will introduce how we improve the semi-analytic model GAEA step-by-step to reproduce the observed quenched fractions, and the lessons we learned. Then we apply this model to high redshift to understand the galaxy quen...</p>

2025.02.18

面向天文观测和深空探测的光电探测技术 [中文报告]

<p>天文及深空科学是主要由实测驱动的学科。观测设备的实测精度和能力的显著提高会大大促进人类对宇宙的认知，包括21世纪所面临的几个重大挑战包括暗物质、暗能量研究，高红移宇宙，以及外行星和生命起源。这些重大科学问题的攻克、前沿研究的突破性进展，已经越来越依赖于观测设备能力的不断提升，包括提高观测的灵敏度、谱分辨率、时间分辨率、角分辨率以及拓展波段覆盖区域。这些观测设备就需要功能强大性能卓越的焦面仪器系统...</p>