Gemini IFU, VLA, and HST observations of the OH megamaser galaxy IRAS F23199+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 IRAS F23199 + 0123. Our observations show that this system is an interacting pair, with two OHM sources associated with the eastern (IRAS 23199E) 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 similar to 6 kpc of IRAS 23199E at a spatial resolution of 2.3 kpc. The GMOS-IFU flux distributions in H alpha and [N (II)] lambda 6583 are similar to that of an HST [N (II)] + H alpha narrow-band image, being more extended along the north-east-southwest direction, as also observed in the continuum HST F814W image. The GMOS-IFU H alpha flux map of IRAS 23199E 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 (full width at half-maximum approximate to 2170 km s(-1)) double-peaked Ha component, from which we derive a black hole mass of M-BH = 3.8(-0.2)(+0.3) x 10(6) M-circle dot. The gas kinematics shows low velocity dispersions (sigma) and low [N (II)]/H alpha ratios for the star-forming complexes and higher sigma and [N (II)]/H alpha surrounding the radio emission region, supporting interaction between the radio plasma and ambient gas. The two OH masers detected in IRAS F23199E are observed in the vicinity of these enhanced s 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 disc, with residuals along the north-south direction being tentatively attributed to emission from the front walls of a bipolar outflow.