Abstract

We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 x 1.9 kpc(2) of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) at a spatial resolution of similar to 250 pc and spectral resolution of 36 km s(-1). Strong [O III], H alpha, [N II] and [S II] emission lines are detected over the entire field of view. The stellar kinematics trace circular rotation with a projected velocity amplitude of +/- 96 km s(-1), a kinematic major axis in position angle of 11 degrees, and an average velocity dispersion of 123 km s(-1). To analyse the gas kinematics, we used aperture spectra, position-velocity diagrams and single/double Gaussian fits to the emission lines. All lines show two clear kinematic components: a rotating component that follows the stellar kinematics, and a larger-dispersion component, close to the systemic velocity (from which most of the [OIII] emission comes), mainly detected to the south-west. We interpret this second component as gas outflowing at similar to 400 km s(-1) in a compact (300 pc) ionization cone with a half-opening angle <= 40 degrees. The counter-cone is probably obscured behind a dust lane. We estimate a mass outflow rate of 1.1 M-circle dot yr(-1), 200 times larger than the estimated accretion rate on to the supermassive black hole, and a kinetic to radiative power ratio of 1.7 x 10(-3). Bar-induced perturbations probably explain the remaining disturbances observed in the velocity field of the rotating gas component.