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Aims. We analyze a MUSE optical integral field spectrum of the star-formingedge-on galaxy IC 1553 in order to study its extraplanar diffuse ionized gas(eDIG) and the processes shaping its disk-halo interface. Methods. We extractedthe optical emission line properties from the integral field spectrum andgenerated the commonly used emission line diagnostic diagrams in order toanalyze the ionization conditions and the distribution of the eDIG.Furthermore, we performed gravitational potential fitting to investigate thekinematics of a suspected galactic outflow. Results. We find that the eDIGscale height has a maximum value of approximately 1.0 kpc and decreases roughlylinearly with the radial distance from the galactic center in projection. Theionization state of the eDIG is not consistent with a pure photoionizationscenario and instead requires a significant contribution from shock ionization.This, in addition to the gas kinematics, strongly suggests the presence of agalactic scale outflow, the origin of which lies at least 1.4 kpc away from thegalactic center. The inferred shock velocity in the eDIG of approximately 225km s-1 is comparable to the escape velocity estimated from our potentialmodelling. The asymmetric distribution of currently star-forming clustersproduces a range of different ionization conditions in the eDIG. As a result,the vertical emission line profiles vary quantitatively and qualitatively alongthe major axis of the galaxy. This analysis illustrates that it is crucial instudies of the eDIG to use observations that take the spatial and kinematicaldistributions into account, such as those done with integral field units, toform an accurate picture of the relevant physical properties.

Evidence for a large off-centered galactic outflow and its connection to the extraplanar diffuse ionized gas in IC 1553