Overpressured cocoons in extragalactic radio sources

Details Overpressured cocoons in extragalactic radio sources Overpressured cocoons in extragalactic radio sources

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345l..21b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. L21-L24. Research supported by the Rockwell

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Computational Astrophysics, Extragalactic Radio Sources, Radio Galaxies, Radio Jets (Astronomy), Cygnus Constellation, Evolution (Development), Intergalactic Media, Red Shift, Star Formation

Scientific paper

It is shown that the cocoons of shocked gas which surround powerful double radio sources can have significantly higher pressures than the surrounding intergalactic medium. The pressures can be high enough to confine the jets in these sources, obviating the need for magnetic confinement. The cocoon pressure and the age of a radio source may be estimated from observable quantities, as demonstrated here for the radio galaxy Cygnus A. It is suggested that overpressured cocoons in high-redshift radio galaxies engulf and compress circumgalactic clouds, driving them over the Jeans limit and triggering star formation. It is proposed that this process leads to the observed alignments of optical continuum emission with radio source axes.

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