If nothing can escape a black hole, why do they still emit x-rays?

Answer 1

The black hole does not emit x-rays. It is matter falling towards the black hole that gets accelerated to high speeds and releases x-rays.

Answer 2

Within a black hole is a point known as the "event horizon." Anything that passes beyond that point can never again leave the black hole. X-rays and other high-energy emissions are generated outside the event horizon by material spiraling inward and accelerated to near light speed toward the black hole center. The dynamics of this high-velocity, high-energy material allows some of it to flash off into space away from the black hole.

Answer 3

For large black holes, dust falling into it is accelerated to near the speed of light and compressed many fold. This results in a huge amount of "friction" which super heats the matter falling in. This super heated matter emits a black-body spectrum. Because of the extreme heat involved this black-body radiation includes a significant amount of gamma-ray and x-ray radiation.

Smaller black holes exhibit a bizarre phenomenon known as black hole evaporation. Without going into details, (I'm writing a senior thesis on this phenomenon), the temperature of the black hole is inversely related to the mass. So a small enough black hole radiates in the gamma ray spectrum.

Answer 4

i think the x-rays are the result of the black hole's influence on the material adjacent to it