Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247...52n&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 52-58. Research supported by the U.S. Department of Energy and NSF.
Astronomy and Astrophysics
Astronomy
63
Convergent-Divergent Nozzles, Magnetohydrodynamics, Plasma Jets, Radio Sources (Astronomy), Taylor Instability, Density Distribution, Finite Difference Theory, Galactic Rotation, Galactic Structure, Gravitational Fields, Interstellar Gas, Mach Number, Quasars, Radio Galaxies, Velocity Distribution
Scientific paper
The formation and stability of a Blandford-Rees (BR) twin exhaust jet (as observed in quasars, radio galaxies, and SS 433) is investigated, and a formula for relating jet luminosity to the internal energy of the confining cloud is developed. A de Laval nozzle is found to form hydrodynamically in a flat bottomed gravitational potential, remaining globally stable over a luminosity range of about 40, for a fixed confining gas pressure. Global Rayleigh-Taylor instability is observed, limiting the formation of high-luminosity jets, with instability to finite-amplitude Kelvin-Helmholtz (KH) pinching off KH molecules, rather than destroying nozzle structure. Hydrodynamic calculations to determine if the jet can form and remain stable are compared with steady state analytical work of BR (1974) and dynamical calculations of the jet boundary by Wiita (1978).
Norman Michael L.
Smarr Larry
Smith Masson D.
Wilson Richard J.
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