The environments of double radiogalaxies

Details The environments of double radiogalaxies The environments of double radiogalaxies

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084..188r&link_type=abstract

In NASA, Ames Research Center, The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 188-190 (SEE N91-

Astronomy and Astrophysics

Astronomy

Estimating, Gas Density, Gas Pressure, Internal Pressure, Radio Galaxies, Radio Sources (Astronomy), X Rays, Confinement, Distribution (Property), Halos, Mathematical Models, Shock Waves

Scientific paper

Discussed here are simple methods by which the densities and pressures of the gas confining double radiogalaxies can be estimated from optical and x ray data. By applying these methods to an unbiased sample of nearby (z less than 0.5) double radiogalaxies, the author quantifies the empirical relation between the external confining pressure and the internal pressure of the lobes as inferred from the minimum energy argument. This relation is explained by an analytic model in which the lobes are statically confined by ambient material pre-heated in the bow-shock of the advancing radiosource. Such a model allows one to estimate source expansion speeds from a combination of radio and environmental data, and estimate properties of the environment from radio data alone, providing expansion speeds can be estimated from multifrequency observations.

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