University of Hertfordshire

The environments of FR II radio sources

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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Original languageEnglish
Title of host publicationIn: Procs of Particles and Fields in Radio Galaxies, ASP Conference Series 250
PublisherAstronomical Society of the Pacific
ISBN (Print)1-58381-090-0
Publication statusPublished - 2001


Using ROSAT observations, we estimate gas pressures in the X-ray-emitting media surrounding 63 FR II radio galaxies and quasars. We compare these pressures with the internal pressures of the radio-emitting plasma estimated by assuming minimum energy or equipartition. The majority of the radio sources (including 12/13 sources with modelled, spatially resolved X-ray emission) appear to be underpressured with respect to the external medium, suggesting that simple minimum-energy arguments underestimate the sources' internal energy densities. Some consequences of this result are discussed.


Original paper can be found at: Astronomical Society of the Pacific

ID: 179136