UNCOVER

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UNCOVER, or Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization, was a general observer survey program on the James Webb Space Telescope that imaged the Abell 2744 cluster between November 2022 and July 2024. [1] The large treasury program aimed to make use of Abell 2744's gravitational lensing to observe the earliest galaxies formed at the beginning of the epoch of reionization. [2] [3] Imaging from the program was used to discover several extremely distant objects, such as UNCOVER-z13 and UNCOVER-z12.

Contents

Program

UNCOVER was awarded over 100 hours of combined observation time in Cycle 1 of the JWST general observer program, which awarded a total of about 6000 hours to 266 programs. [4] The program began with initial observations in November 2022, with follow-up observations in July/August 2023 and July 2024 on objects of interest. [1]

Notable Discoveries

References

  1. 1 2 "UNCOVER: Ultra-deep NIRCam and NIRSpec Observations Before the Epoch of Reionization". stsci.edu. Retrieved 3 February 2026.
  2. ↑ Bezanson, Rachel; Labbe, Ivo; Whitaker, Katherine E.; Leja, Joel; Price, Sedona H.; Franx, Marijn; Brammer, Gabe; Marchesini, Danilo; Zitrin, Adi; Wang, Bingjie; Weaver, John R.; Furtak, Lukas J.; Atek, Hakim; Coe, Dan; Cutler, Sam E.; Dayal, Pratika; Dokkum, Pieter van; Feldmann, Robert; Schreiber, Natascha Forster; Fujimoto, Seiji; Geha, Marla; Glazebrook, Karl; Graaff, Anna de; Greene, Jenny E.; Juneau, Stephanie; Kassin, Susan; Kriek, Mariska; Khullar, Gourav; Maseda, Michael; Mowla, Lamiya A.; Muzzin, Adam; Nanayakkara, Themiya; Nelson, Erica J.; Oesch, Pascal A.; Pacifici, Camilla; Pan, Richard; Papovich, Casey; Setton, David; Shapley, Alice E.; Smit, Renske; Stefanon, Mauro; Taylor, Edward N.; Williams, Christina C. (2022). "The JWST UNCOVER Treasury survey: Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization". The Astrophysical Journal. 974 (1): 92. arXiv: 2212.04026 . Bibcode:2024ApJ...974...92B. doi: 10.3847/1538-4357/ad66cf .
  3. ↑ "UNCOVER: Ultra-deep NIRCam and NIRSpec Observations Before the Epoch of Reionization" (PDF). Archived from the original (PDF) on 2022-03-08.
  4. ↑ "General Observer Programs in Cycle 1". stsci.edu. Retrieved 3 February 2026.
  5. ↑ Jefferson, Brandie (March 1, 2024). "Rachel Bezanson was on a team of astronomers that detected a black hole in the early universe". University of Pittsburgh.
  6. ↑ Devlin, Hannah (2 September 2025). "'A paradigm change': black hole spotted that may have been created moments after big bang". The Guardian. Retrieved 2025-09-02.
  7. ↑ Juodžbalis, Ignas; Marconcini, Cosimo; D'Eugenio, Francesco; Maiolino, Roberto; Marconi, Alessandro; Übler, Hannah; Scholtz, Jan; Ji, Xihan; Arribas, Santiago; Bennett, Jake S.; Bromm, Volker; Bunker, Andrew J.; Carniani, Stefano; Charlot, Stéphane; Cresci, Giovanni; Dayal, Pratika; Egami, Eiichi; Fabian, Andrew; Inayoshi, Kohei; Isobe, Yuki; Ivey, Lucy; Jones, Gareth C.; Koudmani, Sophie; Laporte, Nicolas; Liu, Boyuan; Lyu, Jianwei; Mazzolari, Giovanni; Monty, Stephanie; Parlanti, Eleonora; Pérez-González, Pablo G.; Perna, Michele; Robertson, Brant; Schneider, Raffaella; Sijacki, Debora; Tacchella, Sandro; Trinca, Alessandro; Valiante, Rosa; Volonteri, Marta; Witstok, Joris; Zhang, Saiyang (September 1, 2025). "A direct black hole mass measurement in a Little Red Dot at the Epoch of Reionization". arXiv: 2508.21748 [astro-ph.GA].
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