Spectroscopic Confirmation of an Ultra-Massive Galaxy in a Protocluster at $z\sim 4.9$

Stephanie M. Urbano Stawinski, M. C. Cooper, Ben Forrest +8

We present spectroscopic confirmation of an ultra-massive galaxy (UMG) with $\log (M_{\star }/M_{\odot })=10.98\pm 0.07$ at $z_{\mathrm{spec}}=4.8947$ in the Extended Groth Strip (EGS)…