Institute of Astronomy

Dr Stephen Walker

E-mail: swalker@ast.cam.ac.uk

Personal Homepage

Office: Hoyle H54
Office Tel: (01223) 765848
More Info (Internal)

Preprints
Publications

Research

Galaxy clusters: cluster outskirts, merging galaxy clusters, large scale gas motions, sound waves and cavities in the ICM due to AGN feedback, cooling flows, inverse Compton emission in clusters.

Selected papers

As first author:

The effect of the quasar H1821+643 on the surrounding intracluster medium: revealing the underlying cooling flow

S. A. Walker, A. C. Fabian, H. R. Russell, J. S. Sanders, 2014, MNRAS, 442, 2809 (arXiv:1405.7522)

Large scale gas sloshing out to half the virial radius in the strongest cool core REXCESS galaxy cluster, RXJ2014.8-2430

S. A. Walker, A. C. Fabian, J. S. Sanders, 2014, MNRAS, 441, L31, (arXiv:1402.6894)

An XMM-Newton view of the merging activity in the Centaurus cluster

S. A. Walker, A. C. Fabian, J. S. Sanders, 2013, MNRAS, 435, 3221, (arXiv:1308.2090)

X-ray exploration of the outskirts of the nearby Centaurus cluster using Suzaku and Chandra

S. A. Walker, A. C. Fabian, J. S. Sanders, A. Simionescu, Y. Tawara, 2013, MNRAS, 432, 554, (arXiv:1303.4240)

Galaxy cluster outskirts: a universal entropy profile for relaxed clusters?

S. A. Walker, A. C. Fabian, J. S. Sanders, M. R. George, 2012, MNRAS, 427, L45-L49 (arXiv:1208.5950)

Further X-ray observations of the galaxy cluster PKS 0745-191 to the virial radius and beyond 

S. A. Walker, A. C. Fabian, J. S. Sanders, M. R. George, 2012, MNRAS, 424, 1826 (arXiv:1205.2276)

X-ray observations of the galaxy cluster Abell 2029 to the virial radius

S. A. Walker, A. C. Fabian, J. S. Sanders, M. R. George, Y. Tawara, 2012, MNRAS, 422, 3503 (arXiv:1203.0486)

As co-author:

The X-ray spectrum of the cooling-flow quasar H1821+643 : A massive black hole feeding off the intracluster medium

Christopher S. Reynolds, Anne M. Lohfink, Arif Babul, Andrew C. Fabian, Julie Hlavacek-Larrondo, Helen R. Russell, Stephen A. Walker, ApJ Letters, in press, (arXiv:1408.4803)

Feedback, scatter and structure in the core of the PKS 0745-191 galaxy cluster

J. S. Sanders, A. C. Fabian, J. Hlavacek-Larrondo, H. R. Russell, G. B. Taylor, F. Hofmann, G. Tremblay, S. A. Walker, 2014, MNRAS in press (arXiv:1407.8008)

Do high redshift quasars have powerful jets?

A.C. Fabian, S.A. Walker, A. Celotti, G. Ghisellini, P. Mocz, K.M. Blundell, R.G. McMahon, 2014, MNRAS, 442, L81-L84 (arXiv:1404.7367)

X-ray mapping the outer regions of galaxy clusters at z= 0.23 and 0.45

Q. Daniel Wang and Stephen Walker, 2014, MNRAS, 439, 1796 (arXiv:1401.6205)

The X-ray coronae of the two brightest galaxies in the Coma cluster

J. S. Sanders, A. C. Fabian, M. Sun, E. Churazov, A. Simionescu, S. A. Walker, N. Werner, 2014, MNRAS, 439, 1182 (arXiv:1401.3131)

Linear structures in the core of the Coma cluster

J. S. Sanders, A. C. Fabian, E. Churazov, A. A. Schekochihin, A. Simionescu, S. A. Walker, N. Werner, 2013, Science, Vol. 341 no. 6152 pp. 1365-1368 (arXiv:1309.4866)

Thermodynamics of the Coma Cluster Outskirts 

A. Simionescu, N. Werner, O. Urban, S. W. Allen, A. C. Fabian, A. Mantz, K. Matsushita, P. E. J. Nulsen, J. S. Sanders, T. Sasaki, T. Sato, Y. Takei, S. A. Walker, 2013, ApJ, 775, (arXiv:1302.4140)

 

Selected Posters

XMM-Newton 2012 Science Workshop: Galaxy Clusters as Giant Cosmic Laboratories (ESAC, Madrid, Spain 21st - 23rd May 2012) - Exploring the outskirts of the galaxy clusters Abell 2029 and PKS 0745-191 to the virial radius

Page last updated: 22 August 2014 at 12:24