Discovery of an X-ray Quasar Wind Driving the Cold Gas Outflow in the Ultraluminous Infrared Galaxy IRAS F05189-2524

Abstract

We present new XMM-Newton and NuSTAR observations of the galaxy merger IRAS F05189-2524 which is classified as an ultra-luminous infrared galaxy (ULIRG) and optical Seyfert 2 at $z$ = 0.0426. We test a variety of spectral models which yields a best-fit consisting of an absorbed power law with emission and absorption features in the Fe K band. Remarkably, we find evidence for a blueshifted Fe K absorption feature at $E$ = 7.8 keV (rest-frame) which implies an ultra-fast outflow (UFO) with $v_{\mathrm{out}}=0.11\pm 0.01c$. We calculate that the UFO in IRAS F05189-2524 has a mass outflow rate of ${\dot{M}}_{\mathrm{out}}\gtrsim 1.0M_{\odot }$ yr${}^{-1}$, a kinetic power of ${\dot{E}}_{\mathrm{K}}\gtrsim$ 8% $L_{\mathrm{AGN}}$, and a momentum rate (or force) of ${\dot{P}}_{\mathrm{out}}\gtrsim 1.4L_{\mathrm{AGN}}/c$. Comparing the energetics of the UFO to the observed multi-phase outflows at kiloparsec scales yields an efficiency factor of $f\sim 0.05$ for an energy-driven outflow. Given the uncertainties, however, we cannot exclude the possibility of a momentum-driven outflow. Comparing IRAS F05189-2524 with nine other objects with observed UFOs and large-scale galactic outflows suggests that there is a range of efficiency factors for the coupling of the energetics of the nuclear and galaxy-scale outflows that likely depend on specific physical conditions in each object.

23 pages, 8 figures; accepted by ApJ

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