Is Dark Matter Glowing?

Black holes glow because they have all this gas around them, right? The men a lot of radiation that's rih ide. But if you're made of things that don't interact with photons, like dark matter, then you can't give off photons. So how can it be glowing in a sort of energy sense? It depends on how dark matter interacts. We know that dark matter feels gravity. Can talk to things via gravity. And so dark matter might be able to give off very faint gravitational waves as it's just sort of sitting around,. sloshing around the un s.