Buoyancy-driven inflow to a relic cold core: the gas belt in radio galaxy 3C 386

Ryan T Duffy*, Diana M Worrall, Mark Birkinshaw, Ralph P. Kraft

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
299 Downloads (Pure)


We report measurements from an XMM-Newton observation of the low-excitation radio galaxy 3C 386. The study focusses on an X-ray-emitting gas belt, which lies between and orthogonal to the radio lobes of 3C 386 and has a mean temperature of $0.94\pm0.05$ keV, cooler than the extended group atmosphere. The gas in the belt shows temperature structure with material closer to the surrounding medium being hotter than gas closer to the host galaxy. We suggest that this gas belt involves a `buoyancy-driven inflow' of part of the group-gas atmosphere where the buoyant rise of the radio lobes through the ambient medium has directed an inflow towards the relic cold core of the group. Inverse-Compton emission from the radio lobes is detected at a level consistent with a slight suppression of the magnetic field below the equipartition value.
Original languageEnglish
Pages (from-to)4508-4517
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date21 Apr 2016
Publication statusPublished - 11 Jul 2016


  • Galaxies: Active
  • X-rays: Galaxies


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