Resolving the mystery of FRI particle content

Details Resolving the mystery of FRI particle content Resolving the mystery of FRI particle content

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop....9c&link_type=abstract

XMM-Newton Proposal ID #05502702

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, B2 1113+29, B2 0206+35, Xmm-Newton Proposal Id #05502702

Scientific paper

Understanding the dynamics and energetics of low-power (FR I) radio galaxies is essential to constrain their feedback role in galaxy groups and clusters, but it has long been known that their relativistic electron population and magnetic fields cannot provide enough pressure to balance the measured external pressure if at equipartition. Our recent XMM-Newton studies of FR I radio-galaxy environments reveal the first direct evidence that entrainment of material from the hot-gas environment provides the necessary particle population: the apparent pressure imbalance is linked to radio morphology. We propose to observe a small sample of bridged-morphology FRIs to test the prediction that their lobes should be close to pressure balance at equipartition.

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