Disruption of galactic radio jets by shocks in the ambient medium

Details Disruption of galactic radio jets by shocks in the ambient medium Disruption of galactic radio jets by shocks in the ambient medium

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.335..146n&link_type=abstract

Nature (ISSN 0028-0836), vol. 335, Sept. 8, 1988, p. 146-149. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

60

Galactic Radiation, Radio Jets (Astronomy), Shock Wave Interaction, Astronomical Maps, Centaurus Constellation, Mach Number, Subsonic Flow, Supersonic Flow

Scientific paper

Observations show that jets in moderate luminosity radio galaxies can flare dramatically in a few jet diameters and with opening angles up to 90 deg into diffuse lobes or tails. The collimated jets can be interpreted as moderately supersonic fluid flows, and the lobes or tails as subsonic plumes that are subject to turbulent broadening and entrainment of the ambient medium. Studies indicate that the transition from supersonic to subsonic flow can occur suddenly only if a strong planar shock or Mach disk forms within the jet. It is shown here that such an internal shock is produced as the jet crosses a shock wave in the external medium. For jet disruption the jet Mach number must be less than the wind-shock Mach number. This model is applied to Cen A and wind-angle-tailed radio galaxies.

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