16703

We propose an HST-COS spectroscopy of 8 QSOs probing the extended major axis region of a sample of purely edge-on galaxies. Several studies probing these major axis CGM regions have shown that low-ionization absorption (Mg II) is kinematically correlated with the disk rotation comma a potential signature of gas accretion fueling star formation and adding angular momentum to the disk. However comma similar results for high-ionization material (O VI) show that the O VI absorption is not kinematically correlated with the disk rotation and likely traces the ambient comma volume-filling hotter halo phase. Our study will be the first to simultaneously characterize the phase structure of these accreting streams via absorption from low- and intermediate-ionization species. We have a ground-based spectroscopic program underway to measure the rotation curves of all of our galaxy targets as well as spatially resolved SFRs and metallicities. We will correlate the kinematics of the detected CGM absorption in these COS data comma including Si II comma Si III comma Si IV comma C IV comma and H I Ly-alpha with the galaxy rotation curves as well as the SFR-metallicities in the disk. In addition to unprecedented constraints on mid-ionization phases comma our study will be the first to leverage truly edge-on galaxies in such an analysis comma eliminating uncertainties associated with the galaxy inclination.