Gemini IFU, VLA and HST observations of the OH Megamaser galaxy
  IRASF23199+0123: the hidden monster and its outflow
  We present Gemini Multi-Object Spectrograph (GMOS) Integral field Unit (IFU),
Very Large Array (VLA) and Hubble Space Telescope (HST) observations of the OH
Megamaser (OHM) galaxy IRASF23199+0123. Our observations show that this system
is an interacting pair, with two OHM sources associated to the eastern
(IRAS23199E) member. The two members of the pair present somewhat extended
radio emission at 3 and 20~cm, with flux peaks at each nucleus. The GMOS-IFU
observations cover the inner $\sim$6kpc of IRAS23199E at a spatial resolution
of 2.3~kpc. The GMOS-IFU flux distributions in H$\alpha$ and [NII]$\lambda$6583
are similar to that of an HST [NII]+H$\alpha$ narrow-band image, being more
extended along the northeast-southwest direction, as also observed in the
continuum HST F814W image. The GMOS-IFU H$\alpha$ flux map of IRAS23199E shows
three extranuclear knots attributed to star-forming complexes. We have
discovered a Seyfert 1 nucleus in this galaxy, as its nuclear spectrum shows an
unresolved broad (FWHM$\approx$2170 kms$^{-1}$) double-peaked H$\alpha$
component, from which we derive a black hole mass of M$_{BH}$=
3.8$^{+0.3}_{-0.2}\times 10^{6}$M$_{\odot}$. The gas kinematics shows low
velocity dispersions ($\sigma$) and low [NII]/H$\alpha$ ratios for the
star-forming complexes and higher $\sigma$ and [NII]/H$\alpha$ surrounding the
radio emission region, supporting interaction between the radio-plasma and
ambient gas. The two OH masers detected in IRASF23199E are observed in the
vicinity of these enhanced $\sigma$ regions, supporting their association with
the active nucleus and its interaction with the surrounding gas. The gas
velocity field can be partially reproduced by rotation in a disk, with
residuals along the north-south direction being tentatively attributed to
emission from the front walls of a bipolar outflow.
