Research
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2025.04.14
Active galactic nuclei and mergers in IR-bright galaxies
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...
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2025.04.14
Wave dark matter
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 rich wave phenomenology, and discuss the implications for astronomical observations and experimental detection.BIOHui Lam got his PhD from Massachusetts Institute of Technology....
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2025.04.10
拉索发现黑洞是PeV宇宙线加速器 [中文]
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，...
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2025.04.03
Exploring the dark sector with gravitational lensing and wide field surveys in imaging and spectroscopy [EN]
Since the discovery of the accelerated expansion of the universe in the 2000, dark matter and dark energy have been the main drivers of research in observational cosmology. At the same time, gravitational lensing, boosted by the Hubble Space Telescope observations, has become a key probe of the dark sector. In this talk, I will review this topic and focus on my research in Euclid and in DESI. I...
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2025.03.27
X-ray polarization study of supernova remnants [EN]
The Imaging X-ray Polarimetry Explorer (IXPE) opens a new window to map magnetic fields in regions of freshly accelerated high-energy particles. By capturing the first spatially resolved X-ray polarization images of supernova remnants—including Cassiopeia A, Tycho, SN 1006, Vela Jr., RX J1713.7−3946, and RCW 86—IXPE probes the turbulent magnetic fields shaped by the Galaxy’s fastest shocks....
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