I am a NASA Postdoctoral Program Fellow at NASA’s Goddard Space Flight Center. 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, to gas sloshing produced by galaxy cluster mergers, to studying AGN feedback in cluster cores, focusing on their X-ray emission.
Contact: stephen.a.walker [at] nasa.gov
Starting August 2019 I will be an Assistant Professor of Physics and Astronomy at the University of Alabama in Huntsville (UAH), and can be contacted at
Contact: stephen.walker [at] uah.edu
I am hiring a postdoc to work at UAH on Galaxy Clusters and AGN feedback, and the application website for the job is here.
Scientists Surprised by Relentless Cosmic Cold Front – NASA Chandra press release, April 2018 – Walker et al. 2018, Nature Astronomy
Perseus’s ancient edge still sharp – Nature 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