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We present a two-dimensional analysis of the gaseous excitation andkinematics of the inner 2.5 x 1.7 kpc^2 of the LINER/Seyfert 1 galaxy Arp 102B,from optical spectra obtained with the GMOS integral field spectrograph on theGemini North telescope at a spatial resolution of 250 pc. Emission-line fluxmaps show the same two-armed nuclear spiral we have discovered in previousobservations with the HST-ACS camera. One arm reaches 1 kpc to the east and theother 500 pc to the west, with a 8.4 GHz VLA bent radio jet correlating withthe former. The gas density is highest (500 - 900 cm^(-3)) at the nucleus andin the northern border of the east arm, at a region where the radio jet seemsto be deflected. Channel maps show blueshifts but also some redshifts at theeastern arm and jet location which can be interpreted as originated in thefront and back walls of an outflow pushed by the radio jet, suggesting alsothat the outflow is launched close to the plane of the sky. We estimate a massoutflow rate along the east arm of 0.26 - 0.32 Msun yr^(-1) (depending on theassumed outflow geometry), which is between one and two orders of magnitudehigher than the mass accretion rate to the active nucleus, implying that thereis mass-loading of the nuclear outflow from circumnuclear gas. The power ofthis outflow is 0.06 - 0.3%Lbol. We propose a scenario in which gas has beenrecently captured by Arp 102B in an interaction with Arp 102A, settling in adisk rotating around the nucleus of Arp 102B and triggering its nuclearactivity. A nuclear jet is pushing the circumnuclear gas, giving origin to thenuclear arms. A blueshifted emitting gas knot is observed at 300 pc south-eastfrom the nucleus and can be interpreted as another (more compact) outflow, witha possible counterpart to the north-west.

Kinematics and excitation of the nuclear spiral in the active galaxy Arp 102B