C. M. Harrison, D. M. Alexander, A. M. Swinbank, Ian Smail, S. Alaghband-Zadeh, F. E. Bauer, S. C. Chapman, R. C. Hickox, R. J. Ivison, A. Del Moro, J. R. Mullaney, N. P. H. Nesvadba
We present integral field spectroscopy observations, covering the [O III]4959,5007 emission-line doublet of eight high-redshift (z=1.4-3.4) ultra-luminous infrared galaxies (ULIRGs) that host active galactic nuclei (AGN) activity, including known sub-millimetre luminous galaxies (SMGs). The targets have moderate radio luminosities that are typical of high-redshift ULIRGs (L[1.4GHz]=10^24-10^25 W/Hz) and therefore are not radio-loud AGN. We de-couple kinematic components due to the galaxy dynamics and mergers from those due to outflows. We find evidence in the most luminous systems, L([O III])\gtrsim10^43 erg/s, for the signatures of large-scale energetic outflows: extremely broad [O III] emission (FWHM \sim 700-1400 km/s) across \sim4-15 kpc, with high velocity offsets from the systemic redshifts (up to \sim850 km/s). These outflows are potentially depositing energy into their host galaxies at considerable rates (\sim10^43-10^45 erg/s) and are likely to unbind some of the gas from the host galaxies. Based on energetic arguments we find that the radiative power of the AGN, as opposed to star formation or radio jets, is likely to dominate in driving these outflows. We suggest that the galaxies observed may represent a key stage in the evolution of massive galaxies.
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http://arxiv.org/abs/1205.1801
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