首页

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...

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...

2026.03.02

An All-Sky 3D Extinction-Curve Map of the Milky Way: Insights into Interstellar Organics

I present the first three-dimensional (3D), full-sky dust map that reveals variations in the extinction curve, parameterized by R(V). Using Gaia XP spectra, we measure extinction curves for over 130 million stars—more than two orders of magnitude more than previously available—enabling us to trace dust properties across the Milky Way with unprecedented detail. Surprisingly, trends in this map...

2026.03.04

A Trapezium-like OB cluster in the making

The Trapezium Cluster in Orion teaches us that massive stars often form together in compact systems—but how such dense OB groupings are assembled remains an open question. In this talk, I will present high-resolution observations with the Atacama Large Millimeter/submillimeter Array (ALMA) that reveal an exceptionally young, deeply embedded massive quadruple OB system in the making. The four m...

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...

2026.01.06

CPUs to GPUs: Transforming Star Formation Simulations with QUOKKA

the past two decades, large-scale numerical simulations on parallel CPU clusters have been crucial for our theoretical understanding of star formation and stellar feedback. As modern supercomputers increasingly pivot toward GPU-dominated architectures, it has become essential to redesign our simulation tools to this new architecture in order to scale up these simulations. In this talk, I will g...

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...

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...

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...

2026.01.07

Variations of the Stellar Mass Function in the Milky Way Halo

I will show that the low-mass stellar mass function in the Milky Way halo using a clean sample of metal-poor main-sequence stars from Gaia DR3 BP/RP (XP) spectra within 1 kpc. Combining probabilistic kinematic halo selection with XP-based [Fe/H] calibrated to SDSS-V/APOGEE, and a forward model with effective volumes, we find that below 0.5 solar mass the halo MF changes strongly with metallicit...