An Extremely Compact, Low-mass Galaxy on its Way to Quiescence at z = 5.2

• Published in: Astrophysical journal. Letters Vol. 949; no. 2; p. L23
• Main Authors: Strait, Victoria, Brammer, Gabriel, Muzzin, Adam, Desprez, Guillaume, Asada, Yoshihisa, Abraham, Roberto, Bradač, Maruša, Iyer, Kartheik G., Martis, Nicholas, Mowla, Lamiya, Noirot, Gaël, Sarrouh, Ghassan T. E., Sawicki, Marcin, Willott, Chris, Gould, Katriona, Grindlay, Tess, Matharu, Jasleen, Rihtaršič, Gregor
• Format: Journal Article
• Language: English
• Published: Austin The American Astronomical Society 01.06.2023; IOP Publishing
• Subjects: Active galactic nuclei; Clusters; Compact galaxies; Galaxies; Post-starburst galaxies; Spectrophotometry; Star & galaxy formation; Star formation; Star formation rate; Stars; Stellar mass

We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part of the CAnadian NIRISS Unbiased Cluster Survey...