2018ApJ...858...39X

We determine the physical conditions and location of the outflow material seen in the mini-BAL quasar SDSS J1111+1437 (z = 2.138). These results are based on the analysis of a high S/N, medium-resolution VLT/X-shooter spectrum. The main outflow component spans the velocity range -1500 to -3000 km s^–1 and has detected absorption troughs from both high-ionization species: C IV, N V, O VI, Si IV, P V, and S IV; and low-ionization species: H I, C II, Mg II, Al II, Al III, Si II, and Si III. Measurements of these troughs allow us to derive an accurate photoionization solution for this absorption component: a hydrogen column density, log(N_H)=21.47_–0.27^+0.21 cm^–2 and ionization parameter, log(U_H)=-1.23_–0.25^+0.20. Troughs produced from the ground and excited states of S IV combined with the derived U_H value allow us to determine an electron number density of log(n_e)=3.62_–0.11^+0.09 cm^–3 and to obtain the distance of the ionized gas from the central source: R=880_–260⁺²¹⁰ pc.