  Context. Quasar outflows are often analyzed to determine their ability to
contribute to active galactic nucleus (AGN) feedback. We have identified a
broad absorption line (BAL) outflow in the VLT/UVES spectrum of the quasar SDSS
J1321-0041. The outflow shows troughs from Fe II, and is therefore identified
as an FeLoBAL. It is quite extreme among that population, as it shows C II and
Si II BALs. Aims. Outflow systems require a kinetic luminosity above
$\sim0.5\%$ of the quasar's luminosity to contribute to AGN feedback. For this
reason, we analyzed the spectrum of J1321-0041 to determine the outflow's
kinetic luminosity, as well as the quasar's bolometric luminosity. Methods. We
measured the ionic column densities from the absorption troughs in the
spectrum, and determined the Hydrogen column density and ionization parameter
using those column densities as our constraints. We also determined the
electron number density $n_e$ based on the ratios between excited state and
resonance state column densities of Fe II and Si II. This allowed us to find
the distance of the outflow from its central source, as well as its kinetic
luminosity. Results. We determined the kinetic luminosity of the outflow to be
$8.4^{+13.2}_{-5.3}\times 10^{45}\text{ erg s}^{-1}$, and the quasar's
bolometric luminosity to be $1.72\pm0.13\times10^{47}\text{ erg s}^{-1}$,
resulting in a ratio of $\dot{E}_k/L_{Bol}=4.8^{+7.7}_{-3.1}\%$. We conclude
that this outflow has sufficient kinetic luminosity to contribute to AGN
feedback.

Astrophysics of Galaxies