Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pcnf.rept...78u&link_type=abstract
In National Inst. for Fusion Science, Proceedings of the Second International Toki Conference on Plasma Physics and Controlled N
Astronomy and Astrophysics
Astrophysics
Active Galactic Nuclei, Magnetic Fields, Magnetohydrodynamics, Quasars, Radio Jets (Astronomy), Star Formation, Angular Momentum, Astronomy, Astrophysics, Bipolarity, Collapse, Magnetic Flux, Spicules, Stellar Rotation, Velocity Distribution
Scientific paper
It is known that there are jet-like phenomena in a wide variety of astronomical hierarchies, ranging from substellar to galactic, with scales of 109 cm in the case of stellar spicule jets, 10(ext 19) cm in the case of star-formation bipolar jets, and 1023 cm in the case of radio jets and lobes from active galactic nuclei and quasars. These are usually seen to be related with large scale magnetic field in a characteristic way. The case is examined of the bipolar jets in the star formation as an example, and demonstrate that a magnetohydrodynamic mechanism proposed by the present author by noting that the central active objects are gravitationally collapsing objects which brought a part of the large scale magnetic flux with their mass. The central object consisted of the accreting disk with angular momentum rotating around the forming star at the center twists up that part of the magnetic field through the differential rotation in the disk. The model predicts that the jets will be spinning inherent to the magnetic stress involved. This dynamically sweeping pinch character causing spinning jets makes a good contrast with the models proposed thus far: based on the wind from the central object having a negligibly small angular momentum, the jets in the previous models will not show any spinning. Therefore, recent detection of the spinning velocity field in some of the bipolar flows gave a strong support to our magnetic model. The model extended to the case of large scale radio jets and emanated from the central object of active galactic nuclei and quasars.
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