2020MNRAS.497.5103C

We investigate the ionized gas excitation and kinematics in the inner 4.3 ×6.2 kpc² of the merger radio galaxy 4C+29.30. Using optical integral field spectroscopy with the Gemini North Telescope, we present flux distributions, line-ratio maps, peak velocities and velocity dispersion maps as well as channel maps with a spatial resolution of ~955 pc. We observe high blueshifts of up to ∼-650 km s^–1 in a region ∼1 arcsec south of the nucleus (the southern knot - SK), which also presents high velocity dispersions (∼250 km s^–1), which we attribute to an outflow. A possible redshifted counterpart is observed north from the nucleus (the northern knot - NK). We propose that these regions correspond to a bipolar outflow possibly due to the interaction of the radio jet with the ambient gas. We estimate a total ionized gas mass outflow rate of {dot}M_ out_ = 25.4 ^+11.5 ^_ -7.5_ M_☉ yr^–1with a kinetic power of {dot}E = 8.1 ^+10.7 ^_ -4.0_ ×10⁴² erg s^–1, which represents 5.8 ^+7.6 ^_ -2.9_ per cent of the active galactic nucleus (AGN) bolometric luminosity. These values are higher than usually observed in nearby active galaxies with the same bolometric luminosities and could imply a significant impact of the outflows in the evolution of the host galaxy. The excitation is higher in the NK - that correlates with extended X-ray emission, indicating the presence of hotter gas - than in the SK, supporting a scenario in which an obscuring dust lane is blocking part of the AGN radiation to reach the southern region of the galaxy.