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The host galaxies of six nearby QSOs are studied on the basis of highresolution HST optical images and spatially resolved VLT slit spectra. The gasionization and velocity are mapped as a function of the distance to the centralQSO. In the majority of the cases, the QSO significantly contributes to the gasionization in its whole host galaxy, and sometimes even outside.  Reflection or scattering of the QSO \ha line from remote regions of thegalaxy is detected in several instances. The line shifts show that, in allcases, the matter responsible for the light reflection moves away from the QSO,likely accelerated by its radiation pressure.  The two faintest QSOs reside in spirals, with some signs of a pastgravitational perturbation. One of the intermediate luminosity QSOs resides ina massive elliptical containing gas ionized (and probably pushed away) by theQSO radiation. The other medium-power object is found in a spiral galaxydisplaying complex velocity structure, with the central QSO moving with respectto the bulge, probably as a result of a galactic collision. The two mostpowerful objects are involved in violent gravitational interactions and one ofthem has no detected host.  These results suggest that (1) large-scale phenomena, such as galacticcollisions, are closely related to the triggering and the feeding of the QSOand (2) once ignited, the QSO has significant influence on its large-scaleneighborhood (often the whole host and sometimes further away).

Understanding the relations between QSOs and their host galaxies from combined HST imaging and VLT spectroscopy