Photographing black holes

[GodLied]

If electromagnetic radiation cannot escape the gravity of black holes, why do x-rays spawn from black holes?

JMG.

[omega]

are you familiar with Hawking Radiation?

in brief, QM states that there are virual antiparticle pairs (both positive and negative) created in space. when one is created near a singularity, one will enter, allowing the other to be emitted as radiation.

[TheXeelee]

As matter falls into a black hole, it spins around in an accretion disk, becoming extrmeley hot and thus emitting x-ray and other forms of radiation. This accretion disk of course lies outside the event horizon--the "point of no return"--and thus the x-rays can excape and not get sucked into the hole.:)

[jcsd]

RIght x-rays are emitted by the frictional forces in the accretion disc of a black hole which is a good wway to oberve a black hole, but tis happens before the matter s past the vent horizon.

Hawking radiation is the mechanism that makes black holes compatible with thermo dunaics and is the influx of negative energy (via virtual particles) into a black hole that cause emmisions of x-rays just outside the event horizion. Howver this effect is tiny and IIRC correctly for a black hole 1 solar mass only gives a surface temp. of about 10^-9n degrees which gets a lot, lot less with the size of a black hole meaning it'snot a great way to detect black holes.

The best way to observe them is their gravitational effect on other bodies esp. in binary systems.