On the MHD origin of one-sided jets.

Details On the MHD origin of one-sided jets. On the MHD origin of one-sided jets.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..329c&link_type=abstract

Astronomy and Astrophysics, v.306, p.329

Astronomy and Astrophysics

Astrophysics

4

Mhd, Ism: Jets And Outflows, Galaxies: Jets

Scientific paper

One-sideness in extragalactic radio sources is usually associated to the relativistic Doppler beaming in jets symmetrically emerging from the central core of an AGN (assumed as a massive compact object surrounded by an accretion disk). However, if the beams are MHD driven and the magnetic configuration in the core region is non-symmetric or has peculiar symmetry properties, the acceleration efficiency can be very different on the two hemispheres of the accretion disk. This magnetic structure may occur if in the disk the field derives from the combination of two components with different origin: i) a dipole primordial magnetic field, ii) a quadrupolar dynamo driven magnetic field. If in the accretion process this multipolar configuration is preserved, in the central region it is found a structure with the toroidal magnetic field not reversing across the disk equatorial plane. This geometry allows steady MHD outflow solutions only in one of the two hemispheres, with consequent intrinsic one-sideness of beams. A similar process could also work for one-sided jets in young stellar objects.

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