Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979kyome..41....1y&link_type=abstract
Kyoto University, Faculty of Engineering, Memoirs, vol. 41, Jan. 1979, p. 1-10.
Astronomy and Astrophysics
Astronomy
Galactic Structure, Intergalactic Media, Interstellar Gas, Radio Jets (Astronomy), Supersonic Jet Flow, Astronomical Models, Energy Sources, Flow Geometry, Galactic Nuclei, Radio Sources (Astronomy), Supersonic Wakes
Scientific paper
The possibility is investigated as to whether jet streams associated with a galaxy or a quasar are explicable as accretion wakes which form when a gravitating body moves through an intergalactic medium with supersonic speed. A comparison of the theory based upon column accretion with a recently observed radio jet of NGC6251 gives good agreement regarding the geometrical shape of the jet and energy stored therein, provided the relative motion has a large Mach number and intergalactic density about 2 x 10 to the -28th g/cu cm is assumed. Again, the observed nuclear jet of NGC 6251 may be explicable along these lines. An accretion hypothesis is specific enough to relate the density and magnetic field in the jet to those of intergalactic gas. Galactic radio jets observed so far are one sided. As for any model which ascribes jets to an outburst of relativistic particles emerging in two opposite directions from a galactic nucleus, it remains to explain the above observed result.
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