Discovery of Metastable He I* $\lambda$10830 Mini-broad Absorption Lines and Very Narrow Paschen $\alpha$ Emission Lines in the ULIRG Quasar IRAS F11119+3257

Abstract

IRAS F11119+3257 is a quasar-dominated Ultra-Luminous InfraRed Galaxy, with a partially obscured narrow-line seyfert 1 nucleus. In this paper, we present the NIR spectroscopy of F11119+3257, in which we find unusual Paschen emission lines, and metastable He I* $\lambda$10830 absorption associated with the previously reported atomic sodium and molecular OH mini-BAL (Broad Absorption Line) outflow. Photo-ionization diagnosis confirms previous findings that the outflows are at kilo-parsec scales. Such large-scale outflows should produce emission lines. We indeed find that high-ionization emission lines ([O III], [Ne III], and [Ne V]) are dominated by blueshifted components at similar speeds to the mini-BALs. The blueshifted components are also detected in some low-ionization emission lines, such as [O II] $\lambda$3727 and some Balmer lines (H$\alpha$, H$\beta$, and H$\gamma$), even though their cores are dominated by narrow ($FWH{M}_{\mathrm{NEL}}=570\pm 40$km s${}^{-1}$) or broad components at the systemic redshift of $z=0.18966\pm 0.00006$. The mass flow rate (230-730$M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$) and the kinetic luminosity (${\dot{E}}_k\sim 10^{43.6-44.8}$erg s${}^{-1}$) are then inferred jointly from the blueshifted emission and absorption lines. In the NIR spectrum of F11119+3257, we also find that the Paschen emission lines are unique, in which a very narrow ($FWHM=260\pm 20$km s${}^{-1}$) component is shown in only Pa$\alpha$. This narrow component most probably comes from heavily obscured star formation. Based on the Pa$\alpha$ and Pa$\beta$ emissions, we obtain an extinction at the $H$ band, $A_H>2.1$ (or a reddenning of $E_{B-V}>$3.7), and a star formation rate of $SFR>130{\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$ that resembles the estimates inferred from the FIR emissions ($SF{R}_{\mathrm{FIR}}=190\pm 90$ $M_{\odot }$ yr${}^{-1}$).

29 pages (single column), 11 figures

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