GS-9209 (galaxy)

GS-9209 is a massive quiescent galaxy^{[NB 1]} that exists at redshift z=4.658 or 25 billion light years. It has a stellar mass of 3.8×10¹⁰ solar masses (7.6×10⁴⁰ kg; 1.67×10⁴¹ lb) which is roughly 10 times the mass of the Milky Way galaxy.^[1][2]

When the universe was around 800 million years old, the star formation rate (SFR) in the GS-9209 galaxy has undergone a sharp decrease. Most of the stars that exist in this galaxy has formed over a 200 million year period when the universe was 600-800 million years old.^[1]

Notes

1. quiescent galaxy: a galaxy that is no longer forming stars

References

1. Carnall, Adam C.; McLure, Ross J.; Dunlop, James S.; McLeod, Derek J.; Wild, Vivienne; Cullen, Fergus; Magee, Dan; Begley, Ryan; Cimatti, Andrea; Donnan, Callum T.; Hamadouche, Massissilia L.; Jewell, Sophie M.; Walker, Sam (July 2023). "A massive quiescent galaxy at redshift 4.658". Nature. 619 (7971): 716–719. arXiv:2301.11413. Bibcode:2023Natur.619..716C. doi:10.1038/s41586-023-06158-6. ISSN 1476-4687. PMC 10371866. PMID 37216978.
2. "Ancient galaxy's traits revealed using space telescope". The University of Edinburgh. 2023-05-25. Retrieved 2024-05-15.