Another Early Universe Surprise From The JWST: A Jellyfish Galaxy
#James Webb Space Telescope #Jellyfish Galaxy #Ram Pressure Stripping #Early Universe #Red Nugget Galaxies #COSMOS2020-635829 #Galaxy Clusters #Astrophysical Journal
📌 Key Takeaways
- JWST has discovered a candidate jellyfish galaxy existing only 5 billion years after the Big Bang
- This discovery challenges current understanding as ram pressure stripping wasn't expected so early in cosmic history
- The galaxy could help explain the puzzling 'Red Nugget' galaxies found at high redshifts
- The star-forming knots in the galaxy's tail are extremely young, confirming they formed after gas was stripped away
📖 Full Retelling
The existence of this jellyfish galaxy at such an early stage in the Universe's history has significant implications for our understanding of galaxy evolution. Dr. Roberts and his team note that this discovery means cluster environments were already harsh enough to strip galaxies earlier than expected, and that galaxy clusters may strongly alter galaxy properties sooner than previously believed. This phenomenon could help explain the puzzling population of 'Red Nugget' galaxies—massive, compact galaxies found at high redshifts that must have formed stars extremely rapidly and then shut down when the Universe was only 1-2 billion years old. While the researchers stress that COSMOS2020-635829 is still only a candidate jellyfish galaxy requiring confirmation, they describe it as an 'important new addition to the broader understanding of environmental quenching at these early times' and a crucial laboratory for studying galaxy transformation in the early universe.
🏷️ Themes
Astronomy, Galaxy Formation, JWST Discoveries, Early Universe
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James Webb Space Telescope
NASA/ESA/CSA space telescope launched in 2021
The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy. It is the largest telescope in space, and is equipped with high-resolution and high-sensitivity instruments, allowing it to view objects too old, distant, or faint for the Hubble Space Telescope. This ...
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Original Source
Another Early Universe Surprise From The JWST: A Jellyfish Galaxy By Evan Gough - February 19, 2026 07:52 PM UTC | Extragalactic Astronomers working with JWST have found a jellyfish galaxy only about 5 billion years after the Big Bang. Jellyfish galaxies are so named because they trail streams of gas that look like jellyfish tentacles. They're created when a galaxy moves rapidly through a cluster, and the intracluster medium strips gas from them, stretching it into long streams. The phenomenon is called ram-pressure stripping, and while it's not unusual, astronomers didn't expect to find it so early in the Universe's history. This is yet another example of the JWST showing us the true nature of the early cosmos. The findings are in a paper titled " JWST Reveals a Candidate Jellyfish Galaxy at z = 1.156 ," and it's published in The Astrophysical Journal. The lead author is Dr. Ian Roberts, Banting Postdoctoral Fellow at the Waterloo Centre for Astrophysics in the Faculty of Science. "We report the discovery of COSMOS2020-635829 as a candidate jellyfish galaxy undergoing ram pressure stripping in a cluster at z > 1," Roberts and his co-researchers write. It was found in the COSMOS field , a well-observed region of space where astronomers search for distant galaxies. It's away from the Milky Way's galactic plane, making it easier to observe. It' s also visible from both the north and south hemispheres, and has no bright foreground stars that can make observing difficult. “We were looking through a large amount of data from this well-studied region in the sky with the hopes of spotting jellyfish galaxies that haven’t been studied before,” lead author Roberts said in a press release . “Early on in our search of the JWST data, we spotted a distant, undocumented jellyfish galaxy that sparked immediate interest.” This discovery is a surprise because of the galaxy's age. It existed about 8.5 billion years ago. Scientists think that ram pressure stripping was only a feature o...
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