VLT/UVES observation of the SDSS J2357-0048 outflow

We found a broad absorption line (BAL) outflow in the VLT/UVES spectrum of the quasar SDSS J235702.54-004824.0, in which we identified four subcomponents. We measured the column densities of the ions in one of the subcomponents (v = -1600 km s^-1), which include O I and Fe II. We found the kinetic luminosity of this component to be at most $\sim 2.4{{\ \rm per\ cent}}$ of the quasar's Eddington luminosity. This is near the amount required to contribute to active galactic nucleus feedback. We also examined the time variability of a C IV mini-BAL found at v = -8700 km s^-1, which shows a shallower and narrower absorption feature attached to it in previous SDSS observations from 2000 to 2001, but not in the spectra from 2005 and onwards.