Broad Emission and Absorption Line Outflows in the Quasar SDSS J163345.22+512748.4

Abstract

We present a detailed study of the optical and NIR emission and absorption line spectrum of the quasar SDSS J163345.22+512748.4. We discovered on the newly acquired NIR spectrum a highly meta-stable neutral helium broad absorption line (BAL) \heiozetz\ with a width of $\sim$ 2000 \kmps\ and a blueshift of $\sim$ 7000 \kmps\ in the velocity space. The BAL system is also significantly detected in \mgii\ and \heiteen. We estimate a column density of $(5.0\pm 1.7)\times 10^{14}$ cm${}^{-2}$ for the HeI*(2~${}^3$S) level, and infer an ionization parameter of $U_A=10^{-1.9\pm 0.2}$ for the BAL outflow assuming that the BAL region is thick enough for a full development of an ionization front. The total column density of the BAL outflow is constrained in the range N${}_{\mathrm{H}}$ $\sim$ 10${}^{21}$-10${}^{21.4}$ cm${}^{-2}$. We also found that the bulk of both MgII and UV FeII, as well as H$\alpha$ broad emission lines (BELs) are blueshifted with a velocity of $\sim$ 2200 \kmps\ with respect to the quasar systemic redshift. We constrain that the blueshifted BEL region has a covering factor $C_f\approx 16\%$, a density n${}_{\mathrm{H}}$ $\sim$ 10${}^{10.6}$-10${}^{11.3}$ cm${}^{-3}$, a column density N${}_{\mathrm{H}}\gtrsim 10^{23}$ cm${}^{-2}$, and an ionization parameter $U_E\sim 10^{-2.1}-10^{-1.5}$. The outflow gas is located at $\sim$0.1 pc away from the central ionization source, at a scale comparable to the BLR. A toy kinetic model has been proposed to reproduce the profile of MgII BEL well if assuming a partial obscured axisymmetric geometry of the outflow with a radial velocity as observed by the BALs.

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