The JWST EXCELS survey: Too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5

A. C. Carnall, F. Cullen, R. J. McLure +21

We report ultra-deep, medium-resolution spectroscopic observations for 4 quiescent galaxies with log${}_{10}(M_{\ast }/{\mathrm{M}}_{\odot })>11$ at $3<z<5$. These data were obtained with J…