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2026.03.26
Yanmei Chen's talk
Host: Cheng L
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2026.03.19
Resolving small-scale dynamics of supermassive black holes in galaxy formation simulations
Supermassive black hole (SMBH) binaries, formed during galaxy mergers, are the primary targets for low-frequency gravitational wave (GW) observatories. Understanding the coalescence process of SMBH binaries in a cosmological galaxy formation context is crucial for accurate GW predictions. However, this has been a long-standing challenge: traditional galaxy formation simulations lack the force r...
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2026.03.09
Mapping 3D Interstellar Magnetic Fields in the Era of Wide-field Surveys
Magnetic fields play a fundamental role in regulating the evolution of interstellar medium and star formation in the Milky Way. However, a comprehensive picture of the 3-dimensional magnetic fields in the Galactic 3-dimensional interstellar space remains unavailable. Spectral-line polarization arising from the Zeeman effect and Goldreich-Kylafis effect probes magnetic fields with velocity infor...
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2026.03.12
Uncovering dark matter distributions: from the Milky Way to nearby galaxies
Dark matter distribution in galaxies is a key to test the LCDM and galaxy formation models. We measure the dark-matter mass distribution for a representative sample of 140 nearby galaxies by combining IFU data from MaNGA and HI spectra from FAST. We find strong evidence that these galaxies exhibit a lower dark-matter densities in their inner regions than predicted by cosmological simulations in...
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2026.03.05
Magneto-Ionic Environment Evolution of FRB 20220529: Clues to a Possible Binary Origin
Fast Radio Bursts (FRBs) are millisecond-duration cosmological transients with unclear origins. Understanding their origins requires not only identifying their emission mechanism, but also characterizing the environments in which they reside. Taking advantage of the high sensitivity of the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we conducted long-term monitoring of the rep...
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2026.01.15
Physical and Chemical Conditions of Planetary Birth Environments
Observational and theoretical studies of exoplanets have matured substantially since the discovery of the first planets outside our Solar System. We now know of thousands of such planets, and together with those in our Solar System, they show a vast diversity in their types, compositions, and orbital characteristics. Understanding this diversity requires understanding where planets form and evo...
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2026.01.12
Probing Stellar Interiors in the Golden Era of Precision Stellar Astrophysics
Since 2010, pioneering time-domain photometric missions (CoRoT, Kepler, and TESS) together with extreme-precision radial-velocity instruments (VLT/ESPRESSO and Keck/KPF), have revealed a rich spectrum of low-amplitude stellar variability driven by rotation, convection, and oscillations. Among these phenomena, stellar oscillations provide a powerful probe of stellar interiors, enabling unique in...
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2026.01.08
A New Era in Extragalactic Astrophysics with JWST NIRCam Wide Field Slitless Spectroscopy
The James Webb Space Telescope (JWST) has transformed our view of galaxy formation in the early Universe. One of its most powerful capabilities is NIRCam wide-field slitless spectroscopy (WFSS). Originally designed as an engineering mode, NIRCam WFSS has evolved into a discovery machine that delivers tens of thousands of spectroscopic redshifts from z=0 to 9. This provides a highly complete and...
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2026.01.05
An X-ray View of Active Galactic Nuclei
Active galactic nuclei (AGN) are powered by accretion onto supermassive black holes (SMBHs) and play a central role in galaxy evolution by tracing SMBH growth across cosmic time. As some of the most luminous objects in the Universe, AGN provide unique laboratories for studying accretion physics and relativistic processes in extreme environments. However, the extremely small physical scales of t...
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2025.11.27
Icy ocean worlds -- from the surface to the interior
Icy moon oceans are promising targets in the search for extraterrestrial life, but characterizing their internal dynamics remains challenging, as most oceanic processes are obscured from direct observation by the overlying ice shell. In contrast, the ice shell itself is relatively accessible to observation and may serve as a window into the ocean below. As the only liquid layer in the system, t...
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