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

doi:10.1093/mnras/stw944

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 journal › Article (Academic Journal) › peer-review

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Abstract

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 language	English
Pages (from-to)	4508-4517
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	459
Issue number	4
Early online date	21 Apr 2016
DOIs	https://doi.org/10.1093/mnras/stw944
Publication status	Published - 11 Jul 2016

Keywords

Galaxies: Active
X-rays: Galaxies

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

abstract = "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.",

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author = "Duffy, {Ryan T} and Worrall, {Diana M} and Mark Birkinshaw and Kraft, {Ralph P.}",

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AU - Duffy, Ryan T

AU - Worrall, Diana M

AU - Birkinshaw, Mark

AU - Kraft, Ralph P.

PY - 2016/7/11

Y1 - 2016/7/11

N2 - 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.

AB - 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.

KW - Galaxies: Active

KW - X-rays: Galaxies

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JF - Monthly Notices of the Royal Astronomical Society

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ER -

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

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Research in planetary formation, astrophysics, and cosmology at Bristol

Research in planetary physics, astrophysics and cosmology at Bristol

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

Abstract

Keywords

Access to Document

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Embargoed Document

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Projects

Research in planetary formation, astrophysics, and cosmology at Bristol

Research in planetary physics, astrophysics and cosmology at Bristol

Cite this