Asymmetric Absorption Profiles of Lyα and Lyβ in Damped Lyman Alpha Systems

Hee-Won Lee

Damped Lyα systems (DLAs) observed in the quasar spectra are characterized by a high neutral hydrogen column density $N_{HI}>2\times 10^{20}\mathrm{c}{\mathrm{m}}^{-2}$. The absorption wing pro…