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We analyze the cross-correlation of 2,705 unambiguously intervening Mg II(2796,2803A) quasar absorption line systems with 1,495,604 luminous redgalaxies (LRGs) from the Fifth Data Release of the Sloan Digital Sky Surveywithin the redshift range 0.36<=z<=0.8. We confirm with high precision apreviously reported weak anti-correlation of equivalent width and dark matterhalo mass, measuring the average masses to be log M_h(M_[solar]h^-1)=11.29[+0.36,-0.62] and log M_h(M_[solar]h^-1)=12.70 [+0.53,-1.16] for systems withW[2796A]>=1.4A and 0.8A<=W[2796A]<1.4A, respectively. Additionally, weinvestigate the significance of a number of potential sources of bias inherentin absorber-LRG cross-correlation measurements, including absorber velocitydistributions and the weak lensing of background quasars, which we determine iscapable of producing a 20-30% bias in angular cross-correlation measurements onscales less than 2'. We measure the Mg II - LRG cross-correlation for 719absorption systems with v<60,000 km s^-1 in the quasar rest frame and find thatthese associated absorbers typically reside in dark matter haloes that are~10-100 times more massive than those hosting unambiguously intervening Mg IIabsorbers. Furthermore, we find evidence for evolution of the redshift numberdensity, dN/dz, with 2-sigma significance for the strongest (W>2.0A) absorbersin the DR5 sample. This width-dependent dN/dz evolution does not significantlyaffect the recovered equivalent width-halo mass anti-correlation and adds toexisting evidence that the strongest Mg II absorption systems are correlatedwith an evolving population of field galaxies at z<0.8, while the non-evolvingdN/dz of the weakest absorbers more closely resembles that of the LRGpopulation.

A Cross-Correlation Analysis of Mg II Absorption Line Systems and Luminous Red Galaxies from the SDSS DR5