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Session: Cosmology and Relativistic Astrophysics

Name: Ms. Elpida Koutsantoniou (National & Kapodistrian Univ. of Athens)
Coauthors: No coauthors were included.
Type: Poster
Title: Algorithms & radiation dynamics near black holes
Abstract:

We study systems of hot accretion disks orbiting astrophysical black holes. These disks have temperatures of a few keVs and emit robustly in the band of X-rays. The accretion disk material then reabsorbs this radiation and develops unilateral braking due to the Poynting-Robertson effect. This alters the material dynamics, modifying the plasma kinematics and the equilibrium conditions. We discuss the results of our computational algorithms that calculate the generated radiation field of accretion disks in curved spacetime. We examine various configurations of disks, estimating the magnitude and the geometrical distribution of these fields. We consider what consequences these recorded radiation forces can have on the arrangements and investigate their possible evolution. Our results include clear indications that the primary factor affecting the radiation field magnitude is the material density gradient rather than the accretion disk volume. We also record evidence of early jet collimating tendencies due to the radiation. Another noteworthy implication of such procedures is the consequent generation of astrophysically significant magnetic fields in small timescales via the Cosmic Battery mechanism. These magnetic fields later twirl and expand leading to the formation of system outflows. Subsequently, the fields are injected into the interstellar or intergalactic space by the jets. Finally, we investigate the assorted information we can retrieve from observations of such structures, such as estimations of the central black hole spin and the system dynamics.