The Radio Bridge Structure and the Gaseous Environments of Powerful Extended Radio Sources

Details The Radio Bridge Structure and the Gaseous Environments of Powerful Extended Radio Sources The Radio Bridge Structure and the Gaseous Environments of Powerful Extended Radio Sources

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt.........5w&link_type=abstract

Thesis (PHD). PRINCETON UNIVERSITY , Source DAI-B 58/03, p. 1332, Sep 1997, 123 pages.

Computer Science

5

Galaxies

Scientific paper

The properties of very powerful extended (FRII) radio sources can be used to probe their gaseous environments. In particular, the density and temperature of the ambient gas may be estimated for individual sources, and, using these estimates for a sample of sources, composite density and temperature profiles can be inferred. The composite density and temperature profiles can be compared with those of known gaseous structures and are found to resemble the gaseous environments found in low-redshift clusters of galaxies. Estimation of the density and temperature requires detailed analysis of the radio data. The former requires estimates of the magnetic field strength in the source and a spectral aging analysis to estimate the lobe propagation velocity; the latter also requires a careful analysis of the bridge shape, which matches predictions of existing blast-wave models of the lateral expansion and yields an estimate of the mach number of the lobe advance. Density and temperature can also be combined to give an estimate of the cooling time for the ambient gas. All of these results are interesting, and each is presented and discussed. The ratio of the true magnetic field strength to the minimum energy value is of great interest. Three methods, one original, are presented and used to estimate this ratio. The three results are consistent with a ratio of 0.25.

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