Revealing an Energetic Galaxy-Wide Outflow in a z ≈ 2 Ultraluminous Infrared Galaxy

摘要

Leading models of galaxy formation require large-scale energeticoutflows to regulate the growth of distant galaxies and their central black holes However, current observational support for this hypothesis at high redshift mostly limited to rare z > 2 radio galaxies. Here we present Gemini-North NIFS Intregral Field Unit (IFU) observations of the [O m]λ5007 emission from. a z ≈ 2 ultraluminous infrared galaxy (ULIRG; L_(IR) > 10~(12) L⊙)with an-optically identified Active Galactic Nucleus (AGN). The spatial extent(≈4-8 kpc) of the high velocity and broad [O m] emission are consistent with that found in z > 2 radio galaxies, indicating the presence of a large-scale energetic outflow in galaxy population potentially orders of magnitude more common than distant radio galaxies. The low radio luminosity of this system indicates that radio bright jets are unlikely to be responsible for driving the outflow. However, estimated energy input required to produce the large-scale outflow signatures (or order≈ 10~(59) ergs over ≈ 30 Myrs) could be delivered by a wind radiatively drix en by the AGN and/or supernovae winds from intense star formation. The energy injection required to drive the outflow is comparable to the estimated binding energy of the galaxy spheroid, suggesting that it can have a significant impact on the evolution of the galaxy. We argue that the outflow observed in this system is likely to be comparatively typical of the high-redshift ULIRG population and discuss the implications of these observations for galaxy formation models.