The C IV absorption-Mg II kinematics connection in ⟨z⟩ ∼ 0.7 galaxies

We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV lambda lambda 1548, 1550 absorption associated with 40 Mg II lambda lambda 2796, 2803 absorption-selected galaxies at 0.4 less than or equal to z less than or equal to 1.4. We report a strong correlation between Mg II kinematics, measured in similar to 6 km s(-1) resolution HIRES/Keck spectra, and W-r(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition W-r(1548)/W-r(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-redshift galaxies. We find tentative evidence (2 sigma) that W-r(1548)/W-r(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z similar to 1.