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In order to study the circumgalactic medium (CGM) of galaxies we develop anautomated pipeline to estimate the optical continuum of quasars and detectintervening metal absorption line systems with a matched kernel convolutiontechnique and adaptive S/N criteria. We process $\sim$ one million quasars inthe latest Data Release 16 (DR16) of the Sloan Digital Sky Survey (SDSS) andcompile a large sample of $\sim$ 160,000 MgII absorbers, together with $\sim$70,000 FeII systems, in the redshift range $0.35<z_{abs}<2.3$. Combining thesewith the SDSS DR16 spectroscopy of $\sim1.1$ million luminous red galaxies(LRGs) and $\sim 200,000$ emission line galaxies (ELGs), we investigate thenature of cold gas absorption at $0.5<z<1$. These large samples allow us tocharacterize the scale dependence of MgII with greater accuracy than inprevious work. We find that there is a strong enhancement of MgII absorptionwithin $\sim 50$ kpc of ELGs, and the covering fraction within $0.5r_{\rm vir}$of ELGs is 2-5 times higher than for LRGs. Beyond 50 kpc, there is a sharpdecline in MgII for both kinds of galaxies, indicating a transition to theregime where the CGM is tightly linked with the dark matter halo. The MgIIcovering fraction correlates strongly with stellar mass for LRGs, but weaklyfor ELGs, where covering fractions increase with star formation rate. Ouranalysis implies that cool circumgalactic gas has a different physical originfor star forming versus quiescent galaxies.

Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16