Dying and relic radio galaxies: vibrant in X-rays

Details Dying and relic radio galaxies: vibrant in X-rays Dying and relic radio galaxies: vibrant in X-rays

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop..120b&link_type=abstract

XMM-Newton Proposal ID #06045302

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Ic2476, J0515-81

Scientific paper

If radio galaxies have a finite lifetime, then there should exist dying or relic examples i.e. radio galaxies whose central engines have ceased to be active but whose extended lobes have not yet faded from view. But only a very few are known at radio wavelengths: they are so rare because the relic stage is very short-lived for a radio galaxy whose lobes are no longer continuously injected with freshly accelerated particles from the hotspots. Though relic radio galaxies are very rare, they represent an unexplored phase in the life-cycle of radio galaxies: as radio galaxies die, their relativistic particles lose energy but dramatically increase the population of Lorentz factor 1000 particles which, importantly, inverse-Compton upscatter CMB photons to the X-ray band.

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