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The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionized outflows in the host galaxies of X-ray AGN

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  • C. M. Harrison
  • D. M. Alexander
  • J. R. Mullaney
  • J. P. Stott
  • A. M. Swinbank
  • V. Arumugam
  • F. E. Bauer
  • R. G. Bower
  • A. J. Bunker
  • R. M. Sharples
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<mark>Journal publication date</mark>21/02/2016
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number2
Volume456
Number of pages26
Pages (from-to)1195-1220
Publication StatusPublished
Early online date1/12/15
<mark>Original language</mark>English

Abstract

We present the first results from the KMOS (K-band Multi-Object Spectrograph) AGN (active galactic nuclei) Survey at High redshift (KASHz), a VLT/KMOS integral-field spectroscopic (IFS) survey of z ≲ 0.6 AGN. We present galaxy-integrated spectra of 89 X-ray AGN (L2-10 keV = 1042-1045 erg s-1), for which we observed [OIII] (z ≈ 1.1-1.7) or Hα emission (z ≈ 0.6-1.1). The targets have X-ray luminosities representative of the parent AGN population and we explore the emission-line luminosities as a function of X-ray luminosity. For the [OIII] targets,≈50 per cent have ionized gas velocities indicative of gas that is dominated by outflows and/or highly turbulent material (i.e. overall linewidths≲600 km s-1). The most luminous half (i.e. LX > 6 × 1043 erg s-1) have a ≲2 times higher incidence of such velocities. On the basis of our results, we find no evidence that X-ray obscured AGN are more likely to host extreme kinematics than unobscured AGN. Our KASHz sample has a distribution of gas velocities that is consistent with a luminosity-matched sample ofz