A helix model for the acceleration of blobs in astrophysical jets

Details A helix model for the acceleration of blobs in astrophysical jets A helix model for the acceleration of blobs in astrophysical jets

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324...93k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 93-111.

Astronomy and Astrophysics

Astronomy

7

Astronomical Models, Axes Of Rotation, Magnetic Fields, Plasma Acceleration, Plasma Jets, Radio Jets (Astronomy), Galactic Nuclei, Plasma-Electromagnetic Interaction, Pre-Main Sequence Stars, Protostars

Scientific paper

A simplified model for an astrophysical jet is developed in which both rotation and magnetic fields are important. In this model, a blob of plasma is emitted by a massive, rotating body along the common magnetic and rotation axis. Expansion of the blob produces helical twisting of the field lines, which are assumed to be frozen into both the blob and the massive body. This generates a magnetic pressure that accelerates the blob along the jet. These concepts are applied to a massive black hole model for an active galactic nucleus, to a neutron star model appropriate to SS 433, and to a model for protostellar objects. For the black hole case, acceleration to relativistic velocities occurs over a distance of about 0.016 pc. In the neutron star case, the strong surface magnetic field maintains the blob in corotation with the neutron star out to a distance of about 0.14 AU, and the acceleration mechanism produces relativistic velocities over a distance of about 0.6 AU. For the protostellar model, this acceleration mechanism yields terminal velocities of about 110-200 km/s.

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