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RE: Classification of galaxies
It’s usually the super massive black hole. The acceleration disc around the event horizon spin around mass it shreds apart at such speeds it super heats the gasses. Then also it could be a gamma ray burst coming from the singularity, the center of the black hole, being jettison outward after feeding on a star.
So meaning the light we are seeing was from a star the was eaten years ago because of how far it is?
Exactly right. Ever how far in light years where the event was witnessed, that’s how long it look for us to see it. So blackhole was say 100 light years away, it too 100 years later for us to see that event.