TY - JOUR
T1 - Bound star clusters observed in a lensed galaxy 460 Myr after the Big Bang
AU - Adamo, Angela
AU - Bradley, Larry D.
AU - Vanzella, Eros
AU - Claeyssens, Adélaïde
AU - Welch, Brian
AU - Diego, Jose M.
AU - Mahler, Guillaume
AU - Oguri, Masamune
AU - Sharon, Keren
AU - Abdurro’uf, null
AU - Hsiao, Tiger Yu Yang
AU - Xu, Xinfeng
AU - Messa, Matteo
AU - Lassen, Augusto E.
AU - Zackrisson, Erik
AU - Brammer, Gabriel
AU - Coe, Dan
AU - Kokorev, Vasily
AU - Ricotti, Massimo
AU - Zitrin, Adi
AU - Fujimoto, Seiji
AU - Inoue, Akio K.
AU - Resseguier, Tom
AU - Rigby, Jane R.
AU - Jiménez-Teja, Yolanda
AU - Windhorst, Rogier A.
AU - Hashimoto, Takuya
AU - Tamura, Yoichi
N1 - Publisher Copyright: © The Author(s) 2024.
PY - 2024/8/15
Y1 - 2024/8/15
N2 - The Cosmic Gems arc is among the brightest and highly magnified galaxies observed at redshift z ≈ 10.2 (ref. 1). However, it is an intrinsically ultraviolet faint galaxy, in the range of those now thought to drive the reionization of the Universe2–4. Hitherto the smallest features resolved in a galaxy at a comparable redshift are between a few hundreds and a few tens of parsecs (pc)5,6. Here we report JWST observations of the Cosmic Gems. The light of the galaxy is resolved into five star clusters located in a region smaller than 70 pc. They exhibit minimal dust attenuation and low metallicity, ages younger than 50 Myr and intrinsic masses of about 106M⊙. Their lensing-corrected sizes are approximately 1 pc, resulting in stellar surface densities near 105M⊙ pc−2, three orders of magnitude higher than typical young star clusters in the local Universe7. Despite the uncertainties inherent to the lensing model, they are consistent with being gravitationally bound stellar systems, that is, proto-globular clusters. We conclude that star cluster formation and feedback likely contributed to shaping the properties of galaxies during the epoch of reionization.
AB - The Cosmic Gems arc is among the brightest and highly magnified galaxies observed at redshift z ≈ 10.2 (ref. 1). However, it is an intrinsically ultraviolet faint galaxy, in the range of those now thought to drive the reionization of the Universe2–4. Hitherto the smallest features resolved in a galaxy at a comparable redshift are between a few hundreds and a few tens of parsecs (pc)5,6. Here we report JWST observations of the Cosmic Gems. The light of the galaxy is resolved into five star clusters located in a region smaller than 70 pc. They exhibit minimal dust attenuation and low metallicity, ages younger than 50 Myr and intrinsic masses of about 106M⊙. Their lensing-corrected sizes are approximately 1 pc, resulting in stellar surface densities near 105M⊙ pc−2, three orders of magnitude higher than typical young star clusters in the local Universe7. Despite the uncertainties inherent to the lensing model, they are consistent with being gravitationally bound stellar systems, that is, proto-globular clusters. We conclude that star cluster formation and feedback likely contributed to shaping the properties of galaxies during the epoch of reionization.
UR - http://www.scopus.com/inward/record.url?scp=85200155691&partnerID=8YFLogxK
U2 - https://doi.org/10.1038/s41586-024-07703-7
DO - https://doi.org/10.1038/s41586-024-07703-7
M3 - Article
C2 - 38914113
SN - 0028-0836
VL - 632
SP - 513
EP - 516
JO - Nature
JF - Nature
IS - 8025
ER -