The nature of the low energy turnover in powerful FRII sources

Details The nature of the low energy turnover in powerful FRII sources The nature of the low energy turnover in powerful FRII sources

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..187e&link_type=abstract

XMM-Newton Proposal ID #05561805

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, 3C 469.1, Mrc 2216-206, 3C 356, Mrc 0947-249, Mrc 2348-235, Xmm-Newton Proposal Id #05561805

Scientific paper

The direct detection of the low-energy turnover in the eastern hotspot of 6C0905+3955 puts serious constraints on the models of the acceleration process. To detect similar turnovers, and investigate their dependence on luminosity, we have chosen a sample of large, powerful, distant, FRII radio sources that contain huge reservoirs of aged synchrotron plasma, emitting X-rays via inverse-Compton scattering of CMB photons. We aim to exploit XMM's excellent soft response and sensitivity to detect this emission and in doing so expand not only our sample of sources with putative low-energy turnovers in their hotspots but also measure the energy contained in the low Lorentz-factor electrons in these sources, which has important implications for the energy dumped into any group or cluster medium.

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