Publications

[54] Hidden Cooling Flows in Clusters of Galaxies II: A Wider Sample
A. C. Fabian, G.J. Ferland, J.S. Sanders, B.R. McNamara, C. Pinto, S.A. Walker, 2022,  MNRAS in press (arXiv:2211.13971)

[53] Chemical enrichment of the ICM within the Virgo cluster I: radial profiles
Efrain Gatuzz, J. Sanders, K. Dennerl, A. Liu, A. C. Fabian, C. Pinto, D. Eckert, H. Russell, T. Tamura, S. A. Walker, J. ZuHone, 2023, MNRAS in press (arXiv:2302.04286)

[52] Possible non-thermal origin of the hard X-ray emission in the merging galaxy cluster SPT-CL J2031-4037
M. S. Mirakhor, S. A. Walker, J. Runge, P. Diwanji, 2022, MNRAS, 516, 1855–1864 (arXiv:2208.09553)

[51] Hidden Cooling Flows in Clusters of Galaxies
A. C. Fabian, G.J. Ferland, J.S. Sanders, B.R. McNamara, C. Pinto, S.A. Walker, 2022, MNRAS, 515, 3336–3345 (arXiv:2207.04951)

[50] Suzaku Observations of the Cluster Outskirts and Intercluster Filament in the Triple Merger Cluster Abell 98
Gabriella E. Alvarez, Scott W. Randall, Yuanyuan Su, Arnab Sarkar, Stephen Walker, Nicholas P. Lee, Craig L. Sarazin, Elizabeth Blanton, 2022, ApJ, 938, 51 (arXiv:2206.08430)

[49] A WHIM origin for the soft excess emission in the Coma cluster
M. Bonamente, M. Mirakhor, R. Lieu, S. Walker, 2022, MNRAS, 514, 416-426 (arXiv: 2205.09466)

[48] The velocity structure of the Intracluster Medium of the Centaurus cluster
E. Gatuzz, J. S. Sanders, R. Canning, K. Dennerl, A. C. Fabian, C. Pinto, H. Russell, T. Tamura, S. A. Walker, J. ZuHone, 2022, MNRAS, 513, 1932-1946 (arXiv: 2203.12635)

[47] Hubble Space Telescope Captures UGC 12591: Bulge/Disk Properties, Star Formation and ‘Missing Baryons’ Census in a Very Massive and Fast Spinning Hybrid Galaxy
Shankar Ray, Joydeep Bagchi, Suraj Dhiwar, Mahadev B. Pandge, Mohammad Mirakhor, Stephen A. Walker, Dipanjan Mukherjee, Joe Jacob, Biju K. George, 2022, MNRAS, 517, 99–117 (arXiv: 2203.02885)

[46] Is there an enormous cold front at the virial radius of the Perseus cluster?
S. A. Walker, M. S. Mirakhor, J. ZuHone, J. S. Sanders, A. C. Fabian, P. Diwanji, 2022, ApJ, 929, 37 (arXiv: 2006.14043)

[45] Cluster outskirts and their connection to the cosmic web
Stephen Walker, Erwin Lau, 2022, Accepted for publication in Springer. This Chapter will appear in the Section “Galaxy Clusters” (Section Editors: E. Pointecouteau, E. Rasia, A. Simionescu) of the “Handbook of X-ray and Gamma-ray Astrophysics” (Editors in chief: C. Bambi and A. Santangelo), (arXiv: 2202.07056)

[44] The interaction between rising bubbles and cold fronts in cool core clusters
A. C. Fabian, J. ZuHone and S. A. Walker, 2022, MNRAS, 510, 4000-4018, (arXiv: 2106.03662)

[43] The unusually high dark matter concentration of the galaxy group NGC 1600
J. Runge, S. A. Walker, M. S. Mirakhor, 2022, MNRAS, 509, 2647-2653 (arXiv: 2110.13931)

[42] A detailed study of the bridge of excess X-ray emission between the galaxy clusters Abell 2029 and Abell 2033
M. S. Mirakhor, S. A. Walker, J. Runge, 2022, MNRAS, 509, 1109-1118 (arXiv: 2110.06224)

[41] Measuring sloshing, merging and feedback velocities in the Virgo cluster
Efrain Gatuzz, J. S. Sanders, K. Dennerl, C. Pinto, A. C. Fabian, T. Tamura, S. A. Walker, J. ZuHone, 2021, MNRAS, 511, 4511–4527, (arXiv: 2109.06213)

[40] Gas clumping in the outskirts of the Virgo cluster
M. S. Mirakhor and S. A. Walker, 2021, MNRAS, 506, 139–148, (arXiv: 2106.09732)

[39] Voyage through the Hidden Physics of the Cosmic Web
A. Simionescu, S. Ettori, N. Werner, D. Nagai, F. Vazza, H. Akamatsu, C. Pinto, J. de Plaa, N. Wijers, D. Nelson, E. Pointecouteau, G. W. Pratt, D. Spiga, E. Lau, M. Rossetti, F. Gastaldello, V. Biffi, E. Bulbul, J. W. den Herder, D. Eckert, F. Fraternali, B. Mingo, G. Pareschi, G. Pezzulli, T. H. Reiprich, J. Schaye, S. A. Walker, J. Werk, 2021,  Experimental Astronomy, (arXiv:1908.01778)

[38] Probing ultra-diffuse galaxies out to the virial radius of the Coma cluster with XMM-Newton
M. S. Mirakhor and S. A. Walker, 2021, MNRAS, 503, 679-687, (arXiv: 2102.11285)

[37] Probing within the Bondi radius of the ultramassive black hole in NGC 1600
J. Runge and S. A. Walker, 2021, MNRAS, 502, 5487-5494 (arXiv: 2102.06216)

[36] Exploring the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy with XMM-Newton
M. S. Mirakhor, S. A. Walker, J. Bagchi, A. C. Fabian, A. J. Barth, F. Combes, P. Dabhade, L. C. Ho, M. B. Pandge, 2021, MNRAS, 500, 2503–2513 (arXiv: 2010.15131)

[35] A high coverage view of the thermodynamics and metal abundance in the outskirts of the nearby galaxy cluster Abell 2199
M. S. Mirakhor and S. A. Walker, 2020, MNRAS, 497, 3943 (arXiv: 2007.13768)

[34] A complete view of the outskirts of the Coma cluster
M. S. Mirakhor and S. A. Walker, 2020, MNRAS, 497, 3204 (arXiv: 2007.12194)

[33] Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton
J. S. Sanders, K. Dennerl, H. R. Russell, D. Eckert, C. Pinto, A. C. Fabian, S. A. Walker, T. Tamura, J. ZuHone, F. Hofmann, 2020, A&A, 633, A42, (arXiv:1911.13108)

[32] The X-ray Coronae of two massive galaxies in the core of the Perseus cluster
N. Arakawa, A. C. Fabian, S A. Walker, 2019, MNRAS, 488, 894 (arXiv:1906.11867)

[31] The Massively Accreting Cluster A2029
Jubee Sohn, Margaret J. Geller, Stephen A. Walker, Ian Dell’Antonio, Antonaldo Diaferio, Kenneth J. Rines, 2019, ApJ, 871, 129 (arXiv:1808.00488)

[30] The Physics of Galaxy Cluster Outskirts
Stephen Walker, Aurora Simionescu, Daisuke Nagai, Nobuhiro Okabe, Dominique Eckert, Tony Mroczkowski, Hiroki Akamatsu, Stefano Ettori, Vittorio Ghirardini, 2019, Space Science Reviews,  215: 7,  doi.org/10.1007/s11214-018-0572-8 (arXiv:1810.00890)

[29] What fraction of the density fluctuations in the Perseus cluster core is due to gas sloshing rather than AGN feedback?
S. A. Walker, J. S. Sanders, A. C. Fabian, 2018, MNRAS, 481, 1718, (arXiv:1808.10460)

[28] The split in the ancient cold front in the Perseus cluster
Stephen A. Walker, John ZuHone, Andy Fabian, Jeremy Sanders, 2018, Nature Astronomy 2, 292-296, (arXiv:1803.00898)

[27] Hydrostatic Chandra X-ray analysis of SPT-selected galaxy clusters – I. Evolution of profiles and core properties
J. S. Sanders, A. C. Fabian, H. R. Russell, S. A. Walker, 2018, MNRAS, 474, 1065 (arXiv:1705.09299)

[26] XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326
Yanli Ai, A.C. Fabian, Xiaohui Fan, S.A. Walker, G. Ghisellini, T. Sbarrato, Liming Dou, Feige Wang, Xue-Bing Wu, Longlong Feng, 2017, MNRAS, 470, 1587, (arXiv:1705.06388)

[25] Is there a giant Kelvin-Helmholtz instability in the sloshing cold front of the Perseus cluster?
S. A. Walker, J. Hlavacek-Larrondo, M. Gendron-Marsolais, A. C. Fabian, H. Intema, J. S. Sanders, J. T. Bamford, R. van Weeren, 2017, MNRAS, 468, 2506, (arXiv:1705.00011)

[24] Do sound waves transport the AGN energy in the Perseus Cluster?
A.C. Fabian, S.A. Walker, H.R. Russell, C. Pinto, J.S. Sanders, C.S. Reynolds, 2017, MNRAS, 464, L1 (arXiv:1608.07088)

[23] Applications for edge detection techniques using Chandra and XMM-Newton data: galaxy clusters and beyond
S. A. Walker, J. S. Sanders, A. C. Fabian, 2016, MNRAS, 461, 684, (arXiv:1606.01255)

[22] HST imaging of the dusty filaments and nucleus swirl in NGC4696 at the centre of the Centaurus Cluster
A.C. Fabian, S.A. Walker, H.R. Russell, C. Pinto, R.E.A. Canning, P. Salome, J.S. Sanders, G.B. Taylor, E.G. Zweibel, C.J. Conselice, F. Combes, C.S. Crawford, G.J. Ferland, J.S. Gallagher III, N.A. Hatch, R.M. Johnstone, C.S. Reynolds, 2016, MNRAS 461, 922, (arXiv:1606.02436)

[21] Detecting edges in the X-ray surface brightness of galaxy clusters
J.S. Sanders, A.C. Fabian, H.R. Russell, S.A. Walker, K.M. Blundell, 2016, MNRAS, 460, 1898, (arXiv:1605.02911)

[20] A very deep Chandra view of metals, sloshing and feedback in the Centaurus cluster of galaxies
J.S. Sanders, A.C. Fabian, G.B. Taylor, H.R. Russell, K.M. Blundell, R.E.A. Canning, J. Hlavacek-Larrondo, S.A. Walker, C.K. Grimes, 2016, MNRAS, 457, 82 (arXiv:1601.01489)

[19]  Constraining gas motions in the Centaurus cluster using X-ray surface brightness fluctuations and metal diffusion
S. A. Walker, J. S. Sanders, A. C. Fabian, 2015, MNRAS, 453, 3699, (arXiv:1508.04285)

[18]  X-ray Analysis of Filaments in Galaxy Clusters
S. A. Walker, P. Kosec, A. C. Fabian, J. S. Sanders, 2015, MNRAS, 453, 2480, (arXiv:1508.01037)

[17] Effects of the variability of the nucleus of NGC1275 on X-ray observations of the surrounding intracluster medium
A.C. Fabian, S.A. Walker, C. Pinto, H.R. Russell, A.C. Edge, 2015, MNRAS, 451, 3061, (arXiv:1505.03754)

[16]  A deep Chandra observation of the hot gaseous halo around a rare, extremely massive and relativistic jet launching spiral galaxy
S. A. Walker, J. Bagchi, A. C. Fabian, 2015, MNRAS, 449, 3527, (arXiv:1411.1930)

[15]  Exploring the origin of a large cavity in Abell 1795 using deep Chandra observations
S. A. Walker, A. C. Fabian, P. Kosec, 2014, MNRAS, 445, 3444, (arXiv:1409.6545)

[14] 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, 792, L41, (arXiv:1408.4803)

[13] 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, 444, 1497, (arXiv:1407.8008)

[12] 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)

[11] 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)

[10] 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)

[9] 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)

[8] 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)

[7] 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)

[6] 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)

[5] 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)

[4] 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)

[3] 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 (arXiv:1208.5950)

[2] 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)

[1] 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)

Newsletters:

[1] Edge Detection Gives Chandra a Sharper View of Cluster Astrophysics
Jeremy Sanders, Stephen Walker, John ZuHone, and Elena Bellomi, Chandra Newsletter Issue 25

White papers:

[6] Line Emission Mapper (LEM): Probing physics of cosmic ecosystems Ralph Kraft, Maxim Markevitch, Caroline Kilbourne, the LEM team, (arXiv:2211.09827)

[5] Unveiling the Galaxy Cluster – Cosmic Web Connection with X-ray observations in the Next Decade (Astro2020 white paper), arXiv:1903.04550
Stephen A. Walker, Daisuke Nagai, A. Simionescu, M. Markevitch, H. Akamatsu, M. Arnaud, C. Avestruz, M. Bautz, V. Biffi, S. Borgani, E. Bulbul, E. Churazov, K. Dolag, D. Eckert, S. Ettori, Y. Fujita, M. Gaspari, V. Ghirardini, R. Kraft, E. T. Lau, A. Mantz, K. Matsushita, M. McDonald, E. Miller, T. Mroczkowski, P. Nulsen, N. Okabe, N. Ota, E. Pointecouteau, G. Pratt, K. Sato, X. Shi, G. Tremblay, M. Tremmel, F. Vazza, I. Zhuravleva, E. Zinger, J. ZuHone

[4] Probing Macro-Scale Gas Motions and Turbulence in Diffuse Cosmic Plasmas (Astro2020 white paper), arXiv:1903.04597
Esra Bulbul, Massimo Gaspari, Gabriella Alvarez, Camille Avestruz, Mark Bautz, Brad Benson, Veronica Biffi, Douglas Burke, Nicolas Clerc, Urmila Chadayammuri, Eugene Churazov, Edoardo Cucchetti, Dominique Eckert, Stefano Ettori, Bill Forman, Fabio Gastaldello, Vittorio Ghirardini, Ralph Kraft, Maxim Markevitch, Mike McDonald, Eric Miller, Tony Mroczkowski, Daisuke Nagai, Paul Nulsen, Gabriel W. Pratt, Scott Randall, Thomas Reiprich, Mauro Roncarelli, Aurora Simionescu, Randall Smith, Grant Tremblay, Stephen Walker, Irina Zhuravleva, John ZuHone

[3] Physics of cosmic plasmas from high angular resolution X-ray imaging of galaxy clusters (Astro2020 white paper), arXiv:1903.06356
Maxim Markevitch, Esra Bulbul, Eugene Churazov, Simona Giacintucci, Ralph Kraft, Matthew Kunz, Daisuke Nagai, Elke Roediger, Mateusz Ruszkowski, Alex Schekochihin, Reinout van Weeren, Alexey Vikhlinin, Stephen A. Walker, Qian H. S. Wang, Norbert Werner, Daniel Wik, Irina Zhuravleva, John ZuHone

[2] The Advanced X-ray Imaging Satellite (A Probe-class mission study commissioned by NASA for the NAS Astro2020 Decadal Survey) arXiv:1903.04083
Richard F. Mushotzky, James Aird, Amy J. Barger, Nico Cappelluti, George Chartas, Lia Corrales, Rafael Eufrasio, Andrew C. Fabian, Abraham D. Falcone, Elena Gallo, Roberto Gilli, Catherine E. Grant, Martin Hardcastle, Edmund Hodges-Kluck, Erin Kara, Michael Koss, Hui Li, Carey M. Lisse, Michael Loewenstein, Maxim Markevitch, Eileen T. Meyer, Eric D. Miller, John Mulchaey, Robert Petre, Andrew J. Ptak, Christopher S. Reynolds, Helen R. Russell, Samar Safi-Harb, Randall K. Smith, Bradford Snios, Francesco Tombesi, Lynne Valencic, Stephen A. Walker, Brian J. Williams, Lisa M. Winter, Hiroya Yamaguchi, William W. Zhang, Jon Arenberg, Niel Brandt, David N. Burrows, Markos Georganopoulos, Jon M. Miller, Colin A. Norman, Piero Rosati

[1] AXIS: A Probe Class Next Generation High Angular Resolution X-ray Imaging Satellite R. Mushotzky (for the AXIS Team), SPIE Proceedings (arXiv:1807.02122)

News & Views:

[1] Coma cluster gives up secrets of intergalactic gas
Stephen A. Walker, 2019, Nature Astronomy, News & Views. https://doi.org/10.1038/s41550-019-0821-0