Escape of Resonantly Scattered Ly$\beta$ and H$\alpha$ from Hot and Optically Thick Media

Seok-Jun Chang, Hee-Won Lee, Sang-Hyeon Ahn +4

We investigate the escape of Ly$\beta$ from emission nebulae with a significant population of excited hydrogen atoms in the level $n=2$, rendering them optically thick in H$\alpha$. The tra…