Empirical Constraints of Super-Galactic Winds at z> ∼ 0.5

Under the hypothesis that Mg II absorbers found near the minor axis of a disk galaxy originate in the cool phase of super-galactic winds, we carry out a study to constrain the properties of large-scale galactic outflows at redshift zgal ∼ 0.5 based on the observed relative motions of individual absorbing clouds with respect to the positions and orientations of the absorbing galaxies. We identify in the literature four highly inclined disk galaxies located within 50 kpc and with the minor axis oriented within 45 degrees of a background QSO sightline. Deep HST images of the galaxies are available for accurate characterizations of the optical morphologies of the galaxies. High-quality echelle spectra of the QSO members are also available in public archives for resolving the velocity field of individual absorption clumps. Three galaxies in our sample are located at ρ = 8 − 34 kpc and exhibit strong associated Mg II absorption feature with Wr(2796) ∼ 0.8 Å. One galaxy, located at an impact parameters ρ = 4