GNHeII J1236+6215: A He II $\lambda$1640 emitting and potentially LyC leaking galaxy at $z$ = 2.9803 unveiled through JWST & Keck observations

Chayan Mondal, Kanak Saha, Anshuman Borgohain +6

He II $\lambda$1640 emission in galaxies indicates the presence of sources that produce extreme ionizing photons. Here, we report the discovery of a He II $\lambda$1640 emitting galaxy, GNHeII…