Black hole
Sombrero kara deliği
Centre of the Sombrero Galaxy · 1 billion M☉
A black hole in the middle of the huge bulge of the Sombrero Galaxy (M104), 230 times heavier than the one at the centre of the Milky Way. It feeds gently as a low-luminosity active nucleus (LINER).
| Mass | 1,000 million solar masses |
|---|---|
| Event horizon radius | 19.7 AU: 0.66 times Neptune's orbit |
| Time for light to circle the event horizon once | 17 hours |
| Mass | ~1 × 10⁹ M☉ |
| Distance | 9.6 Mpc |
| Status | Low-luminosity AGN |
The event horizon is the boundary where the escape velocity equals the speed of light: nothing inside, not even light, can get out. Its radius grows in direct proportion to the mass (the Schwarzschild radius, for a non-rotating black hole).