Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252..389d&link_type=abstract
Science (ISSN 0036-8075), vol. 252, April 19, 1991, p. 389-396.
Astronomy and Astrophysics
Astronomy
11
Gas Jets, Interstellar Matter, Plasma Jets, Radio Jets (Astronomy), Elliptical Galaxies, Interstellar Magnetic Fields, Radio Galaxies
Scientific paper
Astrophysical jets are linear strucures associated with stars and galaxies which span about seven orders of magnitude in size; the largest jets emanating from galaxies are about 100 times the size of the galaxy and are the largest single objects in the universe. Jets associated with stars are composed of ionized gas moving away from the star with velocities of a few hundred lm/sec. Extragalactic jets are composed of relativistic particles, magnetic field, and probably additional amounts of cooler ionized plasma either originally ejected in the jet or entrained by it out of the surrounding gaseous medium. The initial outflow velocity for extragalactic jets may be relativistic, and average outflow speeds of several thousand kl/sec are likely. The energy flux carried by extragalactic jets may be in excess of 10 to the 46th ergs/sec, depending upon the nature of the jet. A definition of jet properties, deduced from their interaction with the ambient medium, can place essential constraints on models for the central power source in the parent galaxy or quasi-stellar object where they originate.
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