2019ApJ...877...72T

We report a clear detection of He I*λλ2946, 3189, and 3889 broad absorption line (BAL) in the low-ionization BAL (LoBAL) quasar SDSS J144842.45+042403.1. We also detected new BALs, including Lyα, C II, and Si IV, as well as optical emission lines, such as Hα, Hβ, and [O III]. Using photoionization simulations, we constrained the physical conditions of the outflow to a hydrogen column density of N_H ≃ 10^21.3 cm^–2, an ionization parameter of U ≃ 10^–1.4, and a hydrogen number density of n_H ≃ 10^3.6 cm^–3, and located its radial distance at r_abs ∼ 1.52 kpc from the central engine. The photoionization model predicts the presence of a Lyman limit system with H I column density of N_H I_ ∼ 3.0 x 10¹⁷-1.2 x 10¹⁸ cm^–2, which is confirmed by the GALEX photometry. Interestingly, we found that the [O III] emission line doublet has an outflow component at a large blueshift of v ∼ 1700 km s^–1 and a width of FWHM ∼ 5000 km s^–1. Assuming that we are witnessing the same outflow in both emission and absorption lines, we estimate the global covering fraction of the emission line outflow to be ∼4%, its mass-loss rate to be ∼70 M_☉ yr^–1 and its kinetic luminosity to be ∼3.2 x 10⁴⁴ erg s^–1. SDSS J1448+0424 is a representative example of a significant fraction of LoBAL quasars, which deserves further studies to understand the connection between the growth of supermassive black holes and the evolution of their host galaxies.