The Mean Metal-line Absorption Spectrum of DLAs in BOSS

Lluís Mas-Ribas, Jordi Miralda-Escudé, Ignasi Pérez-Ràfols +6

We study the mean absorption spectrum of the Damped Lyman alpha population at $z\sim 2.6$ by stacking normalized, rest-frame shifted spectra of $\sim 27000$ DLAs from the DR12 of…