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Chao-Wei Tsai

3 articles · 30 co-authors · latest: 2026-06-01

Weighing the Invisible: A Black Hole in the Early Universe

A team of scientists used light from carbon ions in a distant galaxy to determine the rotation speed of gas around the central object. A sharp acceleration of the gas toward the center pointed to a black hole with a mass of about 6.3 billion Suns. This is the first dynamical weighing of a black hole
arXiv:2504.13409 · 2025-04-18

Red Dots Are Not Twins of Dusty Quasars

The Webb telescope spotted a multitude of tiny red galaxies in the early Universe. They were confused with dazzlingly bright galaxies where a black hole heats dust like a blast furnace. Though their color 'portraits' are similar, the red dots have cooler dust—meaning their 'engines' run more modestl
arXiv:2508.21678 · 2025-08-29

A Polygraph for Flashes: How the Pincus–Lyapunov Diagram Uncovers FRBs

To unravel the nature of fast radio bursts (FRBs), astrophysicists applied methods from nonlinear dynamics and constructed the Pincus–Lyapunov diagram, comparing them with pulsar glitches, solar flares, and earthquakes. It turned out: repeating FRBs form a compact cluster on the border between stoch
arXiv:2606.01855v1 · 2026-06-01