The associated absorption features in quasar spectra of the Sload Digital Sky survey .I. \MgII\ absorption doublets

Chen Zhi-Fu, Huang Wei-Rong, Pang Ting-Ting +5

Using the SDSS spectra of quasars included in the DR7Q or DR12Q catalogs, we search for Mg II narrow absorption doublets in the spectra data around Mg II emission lines. We obtain…