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Title:
Direct Evidence for Outflow of Metal-Enriched Gas Along the Radio Jets of Hydra A
Authors:
Kirkpatrick, C. C.; Gitti, M.; Cavagnolo, K. W.; McNamara, B. R.; David, L. P.; Nulsen, P. E. J.; Wise, M. W.
Affiliation:
AA(Department of Physics & Astronomy, University of Waterloo, 200 University Avenue W., Waterloo, ON N2L 3G1, Canada ), AB(INAF—Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy ; Department of Astronomy, University of Bologna, via Ranzani 1, I-40127 Bologna, Italy ; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AC(Department of Physics & Astronomy, University of Waterloo, 200 University Avenue W., Waterloo, ON N2L 3G1, Canada ), AD(Department of Physics & Astronomy, University of Waterloo, 200 University Avenue W., Waterloo, ON N2L 3G1, Canada ; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ; Perimeter Institute for Theoretical Physics, 31 Caroline Street N., Waterloo, ON N2L 2Y5, Canada ), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA ), AG(ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990AA Dwingeloo, The Netherlands ; Astronomical Institute "Anton Pannekoek," University of Amsterdam, P.O. Box 94249, 1090GE Amsterdam, The Netherlands)
Publication:
The Astrophysical Journal Letters, Volume 707, Issue 1, pp. L69-L72 (2009). (ApJL Homepage)
Publication Date:
12/2009
Origin:
IOP
ApJ Keywords:
galaxies: abundances, galaxies: active, X-rays: galaxies: clusters
DOI:
10.1088/0004-637X/707/1/L69
Bibliographic Code:
2009ApJ...707L..69K

Abstract

Using deep Chandra observations of the Hydra A galaxy cluster, we examine the metallicity structure near the central galaxy and along its powerful radio source. We show that the metallicity of the intracluster medium is enhanced by up to 0.2 dex along the radio jets and lobes compared to the metallicity of the undisturbed gas. The enhancements extend from a radius of 20 kpc from the central galaxy to a distance of ~120 kpc. We estimate the total iron mass that has been transported out of the central galaxy to be between 2 × 107 M sun and 7 × 107 M sun, which represents 10%-30% of the iron mass within the central galaxy. The energy required to lift this gas is roughly 1% to 5% of the total energetic output of the active galactic nuclei. Evidently, Hydra A's powerful radio source is able to redistribute metal-enriched, low entropy gas throughout the core of the galaxy cluster. The short re-enrichment timescale <109 yr implies that the metals lost from the central galaxy will be quickly replenished.
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