The Ly$\alpha$, CIV, and HeII nebulae around J1000+0234: a galaxy pair at the center of a galaxy overdensity at $z=4.5$

E. F. Jiménez-Andrade, S. Cantalupo, B. Magnelli +7

Ly$\alpha$ $\lambda$1216 (Ly$\alpha$) emission extending over $\gtrsim 10\mathrm{kiloparsec}(\mathrm{kpc})$ around dusty, massive starbursts at $z\gtrsim 3$ might represent a short-lived phase in the evolut…