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We investigate the host galaxy and environment properties of a sample of 400low z (<0.5) quasars that were imaged in the SDSS Stripe82. We can detect andstudy the properties of the host galaxy for more than 75% of the data sample.We discover that quasar are mainly hosted in luminous galaxies of absolutemagnitude M* -3 < M(R) < M* and that in the quasar environments the galaxynumber density is comparable to that of inactive galaxies of similarluminosities. For these quasars we undertake also a study in u,g,r,i and z SDSSbands and again we discover that the mean colours of the quasar host galaxy itis not very different with respect to the values of the sample of inactivegalaxies. For a subsample of low z sources the imaging study is complemented byspectroscopy of quasar hosts and of close companion galaxies. This studysuggests that the supply and cause of the nuclear activity depends only weaklyon the local environment of quasars. Contrary to past suggestions, for lowredshift quasar there is a very modest connection between recent star formationand the nuclear activity.

On the role of the environments and star formation for quasar activity