Stephen A Walker @astroswalker
Associate Professor of Physics and Astronomy @UAHuntsville. Formerly @NASAGoddard, @Cambridge_Uni and @UniofOxford. Researching #galaxyclusters astrostephen.com Huntsville, AL Joined January 2022-
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Stephen A Walker retweeted
The central region of A3667 in hard X-rays, by @MSMirakhor+@astroswalker A @NASANuSTAR observation of the cluster is presented. The spectrum is better described by a 2T thermal model. An updated limit of B > 0.2 muG is provided from the lack of IC emission arxiv.org/abs/2505.20453
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Stephen A Walker retweeted
#A distant #SpiralGalaxy with colossal radio jets challenges our understanding of galaxy evolution. This anomaly suggests the #MilkyWay might one day produce similar jets, impacting life on Earth. @RoyalAstroSoc doi.org/g89b9d phys.org/news/2025-03-c…
Stephen A Walker retweeted
From Lindsey Gordon: Bundle up – we’re taking a look at some cool simulations of cluster cold fronts. 🔭✨️ astrobites.org/2024/11/11/col…
Stephen A Walker retweeted
On the largest scales, our universe looks like a giant web. 🕸 Clusters and superclusters of galaxies form along giant thread-like structures with voids in between. #MondayMotivation #NASAHalloween
Stephen A Walker retweeted
We are thrilled that AXIS has been selected to advance to Phase A. Our team is eager to continue supporting AXIS and the remarkable scientific discoveries it will deliver. #AXISTheXrayUniverse nasa.gov/news-release/n…
Stephen A Walker retweeted
#SaveChandra worked 👀👀👀👀❤️❤️❤️❤️❤️🫡🫡🫡🫡🚀🚀🚀🚀
Stephen A Walker retweeted
Are we alone? X-ray observations of nearby stars are helping astronomers identify the best targets to search for exoplanets with conditions suitable for life. Explore more at: s.si.edu/exoplanets24 #AAS244 🪐
Stephen A Walker retweeted
The world’s most powerful space telescope has done it again. Webb has discovered what appears to be a new record-holder for the most distant known galaxy — shattering its own previous record. This galaxy existed only 290 million years after the big bang: blogs.nasa.gov/webb/2024/05/3…
Stephen A Walker retweeted
Today Chandra is studying a galaxy in the constellation Canes Venatici (Latin for "hunting dogs"). Nearby in the sky is M63, also known as the Sunflower Galaxy. Similar in size to our own Milky Way Galaxy, this celestial bloom contains over 400 billion stars! 🌻✨
Stephen A Walker retweeted
Can we vent? Scientists have discovered an "exhaust vent" releasing hot gas from a region around Sagittarius A*, the supermassive black hole at the center of our galaxy. It could help reveal how Sagittarius A* ingests & rejects material: s.si.edu/vent #BlackHoleWeek⚫
Stephen A Walker retweeted
Congratulations UAH class of 2024! 🫶
Stephen A Walker retweeted
There’s no doubt that Chandra has revolutionised our understanding of the planets, dwarf planets, moons and comets in our Solar System. It’s not just for far-away astronomy! Chandra is also essential for planetary and Solar System science.
Stephen A Walker retweeted
Celebrate the 25th anniversary of @NASA's Chandra X-ray Observatory with us this year!🎉 Chandra is at the forefront of so many discoveries — what wonders will come next? Learn more at: chandra.si.edu/blog/node/874
Stephen A Walker retweeted
Stephen A Walker retweeted
XRISM spectrum of the Perseus cluster just released!
Stephen A Walker retweeted
We’ve selected a new @NASAUniverse mission! UVEX — UltraViolet Explorer — will conduct a deep survey of the whole sky in two bands of ultraviolet light, providing new insights into galaxy evolution and the lifecycles of stars. Congratulations to Principal Investigator, Fiona…
Stephen A Walker retweeted
We hate to burst your bubble on #BubbleGumDay, but you'll never blow a bubble bigger than the one an O-type star is blowing in RCW 120. This big, beautiful, expanding bubble of hydrogen gas is more than 12 light-years across! (Yes, we'd like to watch it pop too.)
Stephen A Walker retweeted
Congratulations to the @eROSITA_SRG consortium on the first #eROSITA #AllSkySurvey data release 👇🏽
Congratulations to the @eROSITA_SRG consortium on the first #eROSITA #AllSkySurvey data release 👇🏽
Stephen A Walker retweeted
🆕 Spiral galaxies galore! Webb has snapped portraits of 19 spiral galaxies, showing stars, gas, and dust on the smallest scales ever seen beyond our own galaxy ⭐. Read more: esawebb.org/news/weic2403/ or 🧵👇
Stephen A Walker retweeted
How do you measure something that the human eye can't see? JAXA’s @XRISM_jp X-ray telescope has done just this in its 'first light' observations released today. XRISM’s images reveal a cluster of galaxies and a supernova remnant plus more hidden behind the Universe's hot gas.
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