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Multiphase signatures of active galactic nucleus feedback in Abell 2597

Tremblay, G.R.; O'Dea, C.P.; Baum, S.A.; Clarke, T.E.; Sarazin, C.L.; Bregman, J.N.; Combes, F.; Donahue, M.; Edge, A.C.; Fabian, A.C.; Ferland, G.J.; McNamara, B.R.; Mittal, R.; Oonk, J.B.R.; Quillen, A.C.; Russell, H.R.; Sanders, J.S.; Salomé, P.; Voit, G.M.; Wilman, R.J.; Wise, M.W.

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G.R. Tremblay

C.P. O'Dea

S.A. Baum

T.E. Clarke

C.L. Sarazin

J.N. Bregman

F. Combes

M. Donahue

A.C. Fabian

G.J. Ferland

B.R. McNamara

R. Mittal

J.B.R. Oonk

A.C. Quillen

H.R. Russell

J.S. Sanders

P. Salomé

G.M. Voit

M.W. Wise


We present new Chandra X-ray observations of the brightest cluster galaxy (BCG) in the cool-core cluster Abell 2597 (z= 0.0821). The data reveal an extensive kpc-scale X-ray cavity network as well as a 15-kpc filament of soft-excess gas exhibiting strong spatial correlation with archival Very Large Array radio data. In addition to several possible scenarios, multiwavelength evidence may suggest that the filament is associated with multiphase (103–107 K) gas that has been entrained and dredged-up by the propagating radio source. Stemming from a full spectral analysis, we also present profiles and 2D spectral maps of modelled X-ray temperature, entropy, pressure and metal abundance. The maps reveal an arc of hot gas which in projection borders the inner edge of a large X-ray cavity. Although limited by strong caveats, we suggest that the hot arc may be (a) due to a compressed rim of cold gas pushed outwards by the radio bubble or (b) morphologically and energetically consistent with cavity-driven active galactic nucleus heating models invoked to quench cooling flows, in which the enthalpy of a buoyant X-ray cavity is locally thermalized as ambient gas rushes to refill its wake. If confirmed, this would be the first observational evidence for this model.


Tremblay, G., O'Dea, C., Baum, S., Clarke, T., Sarazin, C., Bregman, J., …Wise, M. (2012). Multiphase signatures of active galactic nucleus feedback in Abell 2597. Monthly Notices of the Royal Astronomical Society, 424(2), 1026-1041.

Journal Article Type Article
Publication Date Aug 1, 2012
Deposit Date Apr 8, 2013
Publicly Available Date Nov 26, 2013
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 424
Issue 2
Pages 1026-1041
Keywords Galaxies, Active, Clusters, Abell 2597, Intracluster medium, Star formation.


Published Journal Article (10.8 Mb)

Copyright Statement
This article has been published in the Monthly Notices of the Royal Astronomical Society <br /> © 2012 The Authors.<br /> Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.

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