Astronomers find a new object from the early universe using Webb data
Since it became operational in 2022, the James Webb Space Telescope (JWST) has released some truly breathtaking views of the cosmos. These images highlight how advancements since the days of the venerable Hubble Space Telescope are now providing the deepest and clearest views of the cosmos to date. The work is published on the arXiv preprint server.
In 2022, the James Webb Space Telescope (JWST) began releasing stunning images of the cosmos, showcasing unprecedented clarity and depth compared to previous telescopes like Hubble. One notable example is the galaxy cluster MACS J0308.9+2645, which revealed several gravitational lenses that in turn exposed even more distant galaxies from when the universe was just 1 billion years old.
Among these distant galaxies, astrophysicist Homer Dávila Gutierrez identified a potential gravitational arc candidate (A1) in the JWST archival Near-Infrared Camera (NIRCam) data obtained through the Webb's General Observation (GO) 5293 campaign. Gutierrez found A1 by examining 54 public JWST/NIRCam fields, evaluating 1,591 possible candidates.
A1 stands out due to its elongated shape (axis ratio ~6.5) and alignment with the cluster center, its brightness, and its absence from existing catalogs. After a multi-band analysis, Gutierrez calculated A1's redshift to be z ≈ 4.4, placing it within the first billion years of the universe's existence. The analysis also revealed a second potential candidate, A2, which shares similar geometry but is significantly fainter and less constrained.
The findings suggest that there could be many more early galaxy candidates hidden within Webb's data, highlighting the importance of careful analysis and verification of catalog photometry for extended sources.
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