The eventful life of galaxies in low density environment: a multi-wavelenght approach.

Interaction, accretion and merging events along the Hubble time play a key role in determining the overall galaxies properties. Several studies suggest that such events are well effective not only in clusters but also in the so-called low density environments (LDE). Provided that typical galaxy aggregates in LDE, such as groups, today contain a substantial fraction of the mass of the Universe, this implies that the local environment strongly affects the evolution of most galaxies.

In this context very poor galaxy aggregates and nearly isolated galaxies, in particular early-type galaxies (ETGs) deserve a special value. The former class includes the simplest systems where the effect of the ongoing interaction on the galaxy evolution can be directly tested, while ETGs are widely considered the fossil evidence of the process of galaxy evolution.

We adopt the so called archeological approach, i.e the subject of our investigations are nearby objects, where multi-wavelength studies of single galaxies, of the groups structure and of the inter-galactic medium (IGM) can be performed with an unprecedented detail exploiting the new generation of telescopes and instruments.