MAGIICAT I. The MgII Absorber-Galaxy Catalog
Nikole M. Nielsen, Christopher W. Churchill, Glenn G. Kacprzak,, Michael T. Murphy

TL;DR
The MAGIICAT catalog compiles 182 intermediate redshift galaxies with MgII absorption data, revealing correlations between absorption strength, galaxy properties, and redshift, and providing insights into the circumgalactic medium and galaxy evolution.
Contribution
This work presents a standardized, comprehensive catalog of MgII absorber-galaxy pairs, including new analyses of galaxy properties, absorption correlations, and luminosity functions across redshifts.
Findings
Anti-correlation between MgII equivalent width and impact parameter is highly significant.
Galaxies have colors consistent with Sbc types across redshifts.
MgII absorption is more common in blue, lower stellar mass galaxies, especially at higher redshifts.
Abstract
We describe the MgII Absorber-Galaxy Catalog, MAGIICAT, a compilation of 182 spectroscopically identified intermediate redshift (0.07 < z < 1.1) galaxies with measurements of MgII 2796, 2803 absorption from their circumgalactic medium within projected distances of 200 kpc from background quasars. In this work, we present "isolated" galaxies, which are defined as having no spectroscopically identified galaxy within a projected distance of 100 kpc and a line of sight velocity separation of 500 km/s. We standardized all galaxy properties to the Lambda CDM cosmology and galaxy luminosities, absolute magnitudes, and rest-frame colors to the B- and K-band on the AB system. We present galaxy properties and rest-frame MgII equivalent width, Wr(2796), versus galaxy redshift. The well-known anti-correlation between Wr(2796) and quasar-galaxy impact parameter, D, is significant to the 8 sigma…
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