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Active Galactic Nuclei Research Papers

Decent Essays

Active Galactic Nuclei (AGNs) are very luminous and dense regions in the center of galaxies believed to host Super Massive Black Holes (SMBHs). The electromagnetic radiation sent out from AGNs is conjectured to come from matter that the SMBHs accrete which then takes the form of an accretion disk circling the black hole. These accretion disks are best approximated with an irregular density and temperature distribution made up by very hot gas and plasma~\citep{skadowski2015global}.

The common conceptual intuition of black holes includes the fact that they attract matter with great force in such a manner that it engulfs everything in its proximity. The concept of accretion disks and as we shall see, particles escaping the gravitational potential, …show more content…

At this point the centrifugal force due to the circular motion counteracts the gravitational pull from the black hole to some extent, allowing the cloud to circle the black hole. While the net flow of matter is directed inwards, the spiral radius of the disk does become successively smaller and smaller time goes …show more content…

As there are many processes taking place in the accretion disk, there are several types of outflows, differentiated by the underlying acceleration mechanisms. Winds and jets can, as we shall see, be driven by for example radiative forces, thermal interactions within the disk or magnetic forces, or a combination of mechanisms.

To model this phenomena, we shall break down the individual forces acting upon a particle, investigate which in which regions around the black hole this process takes place and determine the main acceleration mechanisms of the outflow processes. This modelling has been done previously by for example~\citep{yuan2015numerical}, but this paper provides the modelling in full general relativity elevating the accuracy especially in the main outflow and near-black hole regions. This investigation is made for a series of different accretion disk setups, described in further detail in

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