2018ApJ...861..106D -
Astrophys. J., 861, 106-106 (2018/July-2)
Metal-rich trailing outflows uplifted by AGN bubbles in galaxy clusters.
DUAN X. and GUO F.
Abstract (from CDS):
Recent Chandra X-ray observations of many galaxy clusters find evidence for hot metal-rich outflows preferentially aligned with the large-scale axes of X-ray cavities with typical outflow masses of around 109-1010M☉. Here, we perform a suite of three hydrodynamic simulations to investigate if AGN jets could drive these metal-rich outflows in a representative cluster. By using both the tracer variable and virtual particle methods, and additionally following the gas metallicity evolution, we show that metal-rich gas initially located in central regions can indeed be uplifted by the AGN bubble to large distances, a phenomenon called Darwin drift in fluid mechanics, and forming a filamentary trailing outflow extending beyond 100 kpc behind the bubble. The gas entrained in the trailing outflow is entirely outflowing with an average outflow rate of nearly 100M☉ yr–1 during the first 100 Myr, and at later times, a growing lower part flows back towards the cluster center due to gravity. The outflow mass rises up to about 1010M☉ with an entrained iron mass of about 106-107M☉, consistent with observations and predictions from the drift model. By the end of our simulation (∼800 Myr after the AGN event), several 109M☉ of the uplifted high-metallicity gas still remains at large altitudes, potentially contributing to the enrichment of the bulk ICM and the broadening of central metallicity peaks observed in cool-core clusters.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: clusters: intracluster medium - galaxies: jets - hydrodynamics - methods: numerical - X-rays: galaxies: clusters
Simbad objects:
1
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