Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.6603l&link_type=abstract
American Astronomical Society, AAS Meeting #212, #66.03; Bulletin of the American Astronomical Society, Vol. 40, p.257
Astronomy and Astrophysics
Astrophysics
Scientific paper
Formation of supermassive black holes at the centers of massive galaxies leads to the release of a significant amount of gravitational energy, part of which comes out in magnetic fields mixed with highly energetic plasmas. Powerful astrophysical jets and giant radio lobes from extra-galactic radio galaxies are examples of such processes, as revealed by multi-wavelength observations. Magnetic fields are believed to play an important role in determining the overall structure of astrophysical jets, though many fundamental questions remain, e.g., what the collimation mechanisms are, what determines the lobe formation, etc. Observations of X-ray cavities in clusters by Chandra and radio telescopes have provided very important clues on the nature of these jets and lobes. We will give an overview of the physical conditions in these objects and discuss the key plasma processes that are crucial for a better understanding of these objects. We will present 3-D ideal relativistic magnetohydrodynamics simulations of the formation, propagation, termination and stability of large scale magnetic jets, and make comparisons between simulation results and observations. We will discuss the astrophysical implications of the magnetic energy dissipation in radio lobes as they expand and mix with the background inter-galactic medium (IGM). Laboratory plasma experiments aimed at understanding the formation and stability of jets and the interaction between magnetically dominated lobes with a plasma background will also be presented.
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