And thinking of doughnuts... with jets. 🍩from article - This shows the center of Cygnus A, covering an area about 5,000 light years across or so. The jets are obvious as linear features stretching across, and the extremely bright nucleus has been subtracted so you can see details in the center. And that’s where the payoff is. The two bright red spots are the inner jets, a few hundred light years long … and surrounding them is a circular feature (seen at an angle so it looks like an ellipse): That’s a dust torus, a doughnut-shaped structure, and that’s the big news here.This feature is colossal, about 1,300 light years across, with a mass of several hundred million times the mass of the Sun, and is made of countless clouds of dust (small grains of silicates and carbon) swirling around the black hole in the center, and much farther out than the hot accretion disk. The dust is so thick it’s completely opaque to visible light, and it’s the key to the active galaxy zoo across the sky. https://www.syfy.com/syfywire/astronomers-spot-a-massive-doughnut-of-material-around-quasar-cygnus-as-supermassive-black
nucleus structure 在 nucleus | Definition, Function, Structure, & Facts | Britannica 的相關結果
Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a ... ... <看更多>