We present the first results from the KMOS AGN Survey at High redshift
(KASHz), a VLT/KMOS integral-field spectroscopic survey of z>0.6 AGN. We
present galaxy-integrated spectra of 89 X-ray AGN (Lx=10^42-10^45 erg/s), for
which we observed O III (z=1.1-1.7) or Halpha 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 O III targets, ~50 per cent have ionised gas velocities indicative of
gas that is dominated by outflows and/or highly turbulent material (i.e.,
overall line-widths >~600 km/s). The most luminous half (i.e., Lx>6x10^43
erg/s) 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 of z<0.4 AGN. This implies little evolution in the prevalence of ionised
outflows, for a fixed AGN luminosity, despite an order-of-magnitude decrease in
average star-formation rates over this redshift range. Furthermore, we compare
our Halpha targets to a redshift-matched sample of star-forming galaxies and
despite a similar distribution of Halpha luminosities and likely star-formation
rates, we find extreme ionised gas velocities are up to ~10x more prevalent in
the AGN-host galaxies. Our results reveal a high prevalence of extreme ionised
gas velocities in high-luminosity X-ray AGN and imply that the most powerful
ionised outflows in high-redshift galaxies are driven by AGN activity.
Beschreibung
[1511.00008] The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionised outflows in the host galaxies of X-ray AGN
%0 Generic
%1 harrison2015survey
%A Harrison, C. M.
%A Alexander, D. M.
%A Mullaney, J. R.
%A Stott, J. P.
%A Swinbank, A. M.
%A Arumugam, V.
%A Bauer, F. E.
%A Bower, R. G.
%A Bunker, A. J.
%A Sharples, R. M.
%D 2015
%K agn ionisation outflows winds
%T The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers
of ionised outflows in the host galaxies of X-ray AGN
%U http://arxiv.org/abs/1511.00008
%X We present the first results from the KMOS AGN Survey at High redshift
(KASHz), a VLT/KMOS integral-field spectroscopic survey of z>0.6 AGN. We
present galaxy-integrated spectra of 89 X-ray AGN (Lx=10^42-10^45 erg/s), for
which we observed O III (z=1.1-1.7) or Halpha 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 O III targets, ~50 per cent have ionised gas velocities indicative of
gas that is dominated by outflows and/or highly turbulent material (i.e.,
overall line-widths >~600 km/s). The most luminous half (i.e., Lx>6x10^43
erg/s) 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 of z<0.4 AGN. This implies little evolution in the prevalence of ionised
outflows, for a fixed AGN luminosity, despite an order-of-magnitude decrease in
average star-formation rates over this redshift range. Furthermore, we compare
our Halpha targets to a redshift-matched sample of star-forming galaxies and
despite a similar distribution of Halpha luminosities and likely star-formation
rates, we find extreme ionised gas velocities are up to ~10x more prevalent in
the AGN-host galaxies. Our results reveal a high prevalence of extreme ionised
gas velocities in high-luminosity X-ray AGN and imply that the most powerful
ionised outflows in high-redshift galaxies are driven by AGN activity.
@misc{harrison2015survey,
abstract = {We present the first results from the KMOS AGN Survey at High redshift
(KASHz), a VLT/KMOS integral-field spectroscopic survey of z>0.6 AGN. We
present galaxy-integrated spectra of 89 X-ray AGN (Lx=10^42-10^45 erg/s), for
which we observed [O III] (z=1.1-1.7) or Halpha 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 [O III] targets, ~50 per cent have ionised gas velocities indicative of
gas that is dominated by outflows and/or highly turbulent material (i.e.,
overall line-widths >~600 km/s). The most luminous half (i.e., Lx>6x10^43
erg/s) 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 of z<0.4 AGN. This implies little evolution in the prevalence of ionised
outflows, for a fixed AGN luminosity, despite an order-of-magnitude decrease in
average star-formation rates over this redshift range. Furthermore, we compare
our Halpha targets to a redshift-matched sample of star-forming galaxies and
despite a similar distribution of Halpha luminosities and likely star-formation
rates, we find extreme ionised gas velocities are up to ~10x more prevalent in
the AGN-host galaxies. Our results reveal a high prevalence of extreme ionised
gas velocities in high-luminosity X-ray AGN and imply that the most powerful
ionised outflows in high-redshift galaxies are driven by AGN activity.},
added-at = {2015-11-03T10:09:44.000+0100},
author = {Harrison, C. M. and Alexander, D. M. and Mullaney, J. R. and Stott, J. P. and Swinbank, A. M. and Arumugam, V. and Bauer, F. E. and Bower, R. G. and Bunker, A. J. and Sharples, R. M.},
biburl = {https://www.bibsonomy.org/bibtex/29b6839db570992f7576fadfba4cc234b/miki},
description = {[1511.00008] The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers of ionised outflows in the host galaxies of X-ray AGN},
interhash = {fd795fc0588b292239de8a8d5f5b6a66},
intrahash = {9b6839db570992f7576fadfba4cc234b},
keywords = {agn ionisation outflows winds},
note = {cite arxiv:1511.00008Comment: Re-submmited to MNRAS after addressing referee's comments. Main paper: 20 pages, 14 figures. Plus appendix},
timestamp = {2015-11-03T10:09:44.000+0100},
title = {The KMOS AGN Survey at High redshift (KASHz): the prevalence and drivers
of ionised outflows in the host galaxies of X-ray AGN},
url = {http://arxiv.org/abs/1511.00008},
year = 2015
}