Stephen Walker


Walker,_Stephen_mediumI am an Assistant Professor of Physics and Astronomy at the University of Alabama in Huntsville (UAH).

My research concentrates on all aspects of galaxy clusters (the largest collapsed structures in the universe), from the outskirts where they are continuing to form from the cosmic web, to gas sloshing produced by galaxy cluster mergers, to studying AGN feedback in cluster cores, focusing on their X-ray emission.

Contact: stephen.walker [at]

Twitter: @astroswalker

Prior to this I have been a NASA Postdoctoral Program (NPP) Fellow at NASA’s Goddard Space Flight Center, and a postdoctoral researcher at the University of Cambridge. My CV is here: Stephen’s Curriculum Vitae (CV)

Recent highlights

TV interview with local Huntsville news channel (November 2021)

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Press releases

Galaxies Go on a Deep Dive and Leave Fiery Tail Behind – NASA press release, June 2023 – Mirakhor, Walker and Runge 2023

First sighting of hot gas sloshing in galaxy cluster – ESA press release, January 2020 – Sanders et al. 2020

Scientists Surprised by Relentless Cosmic Cold Front – NASA Chandra press release, April 2018 – Walker et al. 2018, Nature Astronomy

Perseus’s ancient edge still sharpNature Astronomy cover article, April 2018

Scientists Find Giant Wave Rolling Through The Perseus Cluster – NASA press release, May 2017 – Walker et al. 2017

APOD, May 4th 2017: The Perseus Cluster Waves

NGC 4696: The Arrhythmic Beating of a Black Hole Heart – Chandra press release, April 2017 – Sanders et al. 2016

Tangled threads weave through cosmic oddity – ESA/Hubble press release, December 2016 – Fabian, Walker et al. 2016

APOD, December 7th 2016: NGC 4696: Filaments around a black hole

Clues to the Growth of the Colossus in Coma – NASA press release, September 2013 – Sanders et al. 2013