Can someone help me out and explain what the Active Galactic Nuclei is?

An active galactic nucleus is what is in the centre of the galaxy. Supposedly the amount of EM/luminance that comes from the super massive black hole is caused by accretion? What is this, if someone can explain it in laymen’s terms. Like how can a black hole give off that much light ???

Black-holes are bright, because of all of the stuff that falls "into" one heats up on the way.

Accretion is the effect that results in the flat spiraling structure of galaxies and solar systems (and presumably the whole universe at some scale).
As orbiting material moves around its star, for example, there will be a trend for all this material to flow in a unidirectionally rotating plane (because the stuff that fights the flow gets thrown away, eaten up, or crumbled to dust by collisions).

Hope that helps, I'm sure you'll get better answers
=D

Permit for me to offer a view alternative to the mainstream, status-quo interpretation.

In Plasma Cosmology, there are no black holes except for in the minds of the mathematical physicists. The alleged evidence that is claimed to show proof of black holes, can instead be used to prove there are plasma processes at work such as double layers and large pinches. These process are real and verifiable as they are demonstrated in the laboratory and our near-space environment, across multiple time and space scales.

Halton Arp demonstrated copious evidence that Active Galactic Nuclei are ejecting matter. Using plasma physics, it can be understood that this matter was pinched and condensed from the intergalactic plasma filaments which help to complete the current network in the intergalactic circuits.

Originally posted by Ionized
The alleged evidence that is claimed to show proof of black holes, can instead be used to prove there are plasma processes at work such as double layers and large pinches. These process are real and verifiable as they are demonstrated in the laboratory and our near-space environment, across multiple time and space scales.

If these "Pinches" are anything like those that the (Focus Fussion Society are working on, then the energy densities would be akin to a continuous supernova, ejecting super-heavy isotopes, and a lot of X-rays (which I guess fits what we see at the center of the galaxy).
What sort of spectographic analysis has been done on quasar ejecta?

reply to post by myster0


Quasars, quasi-stellar radio sources, are some of the furthest things ever found, and although we don't have much data on them or their emissions, they are thought to be super massive galactic neuclei.

With more data and knowledge with our own galactic nucleus, we can come to a more solid conclusion of if this is true. Wish we could launch a 'telescope' towards the galactic center, one with instruments for all light spectrums and other instruments to take measure with.

Originally posted by Maddogkull
An active galactic nucleus is what is in the centre of the galaxy. Supposedly the amount of EM/luminance that comes from the super massive black hole is caused by accretion? What is this, if someone can explain it in laymen’s terms. Like how can a black hole give off that much light

???

As material spirals inward toward the black hole, gravitational forces compress the material in a tighter and tighter space. As the material gets compressed, it gets hotter and hotter, and releases all types of EM spectrum radiation, depending on the gravitational force. In the case of a black hole, you typically get the x-rays and gamma rays, which are the most energetic wave forms of EM radiation.

The relative luminance of this EM energy being released is much more than in stars or any other part of the galaxy.

To give an analogy that does not accurately describe bathtub physics nor black hole physics, but merely a method for you to attempt to understand better:

Think of a bathtub. The water in the bathtub is space time. Inside the water of the bathtub, you have various millions of particles floating around that represent matter. Now, imagine that somebody just opened up the drain!

The drain will be our black hole. Space time and the particles in it begin to flow toward, and spiral inward toward the drain of the tub - a single point, as this happens, the particles begin to converge into each others paths in the water, begin to get closer together and eventually start to get in each others spaces, and compress together generating heat which is nothing other than radiation.

If you looked at it in IR, you might see that the drain region was shown to be "hotter" than the surrounding water. As more and more matter is compressed, or accreted, generating a sustained accretion disk in this way, you'll start to see x-rays and perhaps gamma rays being released from the accretion area due to the concentration of mass in this area that is more readily compressed by gravitation forces.