Computer Science – Numerical Analysis
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..111v&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 92, no. 1, p. 111-118
Computer Science
Numerical Analysis
5
Astronomical Models, Ejecta, Energy Dissipation, Force-Free Magnetic Fields, Galactic Radio Waves, Galaxies, Magnetic Field Configurations, Magnetic Field Reconnection, Radio Jets (Astronomy), Self Consistent Fields, Analytic Functions, Cylindrical Bodies, Magnetohydrodynamic Flow, Numerical Analysis, Radial Flow
Scientific paper
The magnetic energy release through field-line reconnection is considered for a force-free jet which expands (or contracts) radially in response to variations in the confining external pressure. The main new result obtained in comparison with previous publications on the subject, where this mechanism has been proposed, is that a self-consistent theory for the reconnective relaxation of the jet's magnetic configuration has been constructed. It enables us to calculate the magnetic energy dissipation rate inside a jet for an arbitrary value of the ratio taur/taunu, where taur is a typical reconnection time and taunu is the expansion time. Thus these results provide a well-grounded support to the conclusion that this magnetic energy dissipation mechanism could, in principle, power the observed radio emission in extragalactic jets. Moreover, knowing the observed radiation power (and, hence, the required energy supply) it is possible to obtain information about the value of taur, which enters in the theory as a phenomenological parameter.
Priest Eric R.
Steele Colin D. C.
Vekstein G. E.
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