The Cliff (cosmological object)

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The Cliff (RUBIES-UDS-154183) is a compact extragalactic object observed as a little red dot with an exceptional (and cliff-like) Balmer jump. It was discovered as part of the James Webb Space Telescope's Red Unknowns: Bright Infrared Extragalactic Survey (RUBIES) in 2024 in the Ultra Deep Survey (UDS). Detailed spectrographic study suggests that it may be a black hole star. [1] [2] [3] [4]

RUBIES-UDS-154183
NIRSpec-PRISM spectrum of The Cliff.jpg
NIRSpec/PRISM spectrum of The Cliff. The orange points show NIRCam and MIRI photometry. [3]
Object typePotential black hole star
Observation data
(Epoch J2000)
Constellation Cetus
02h 17m 38.58s
Declination −05° 07′ 46.79″
Redshift 3.548
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References

  1. ↑ "Are Black Hole Stars real?". www.mpg.de. Retrieved 2025-09-12.
  2. ↑ Berard, Adrienne (2025-09-12). "Mysterious 'red dots' in early universe may be 'black hole star' atmospheres". Phys.org.
  3. 1 2 de Graaff, Anna; Rix, Hans-Walter; Naidu, Rohan P.; Labbé, Ivo; Wang, Bingjie; Leja, Joel; Matthee, Jorryt; Katz, Harley; Greene, Jenny E.; Hviding, Raphael E.; Baggen, Josephine; Bezanson, Rachel; Boogaard, Leindert A.; Brammer, Gabriel; Dayal, Pratika (2025-09-01). "A remarkable ruby: Absorption in dense gas, rather than evolved stars, drives the extreme Balmer break of a little red dot at z = 3.5". Astronomy & Astrophysics. 701: A168. arXiv: 2503.16600 . Bibcode:2025A&A...701A.168D. doi: 10.1051/0004-6361/202554681 . ISSN   0004-6361.
  4. ↑ "Early universe's 'little red dots' may be black hole stars". www.science.org. Retrieved 2025-09-12.
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