The clustering of Luminous Red Galaxies around MgII absorbers
Abstract
We study the cross-correlation between 212 MgII quasar absorption systems and \~20,000 Luminous Red Galaxies (LRGs) selected from the Sloan Digital Sky Survey Data Release 1 in the redshift range 0.4<z<0.8. The MgII systems were selected to have 2796 & 2803 rest-frame equivalent widths >=1.0 Angstrom and identifications confirmed by the FeII 2600 or MgI 2852 lines. Over comoving scales 0.05--13 h-1 Mpc, the MgII--LRG cross-correlation has an amplitude 0.69+/-0.09 times that of the LRG--LRG auto-correlation. Since LRGs have halo-masses greater than 3.5 x 1012 solar masses for MR<-21, this relative amplitude implies that the absorber host-galaxies have halo-masses greater than 2--8 x 1011 Msun. For 1013 Msun LRGs, the absorber host-galaxies have halo-masses 0.5--2.5 x 1012 Msun. Our results appear consistent with those of Steidel et al. (1994) who found that MgII absorbers with Wr>=0.3 Angstrom are associated with ~0.7 L*B galaxies.
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