In the last decade the potential impact of galaxy-scale outflows driven by quasars
on their environment has become widely recognized. Quasars provide radiative
feedback in the form of pressure and photo heating, and have been increasingly
invoked by popular evolution models to regulate both the star formation in the host
galaxies and the accretion of material onto the central supermassive black holes.
In this talk, I will discuss Extremely Red Quasars (ERQs), a unique population
of heavily-reddened quasars at redshift z ∼ 2 − 3 with exotic physical conditions.
Our new NIR observations show that ERQs routinely exhibit [OIII]λλ4959,5007
emission lines with the broadest and most blueshifted profiles ever reported, with
widths and blue-shifted wings reaching ∼6000 km/s. The energy released by
ERQs has the potential to profoundly affect the evolution of host galaxies. ERQs
are candidates to be young objects in a transition stage between dusty starbursts
and unobscured blue quasars: the perfect laboratory where to study powerful
outflows through their peculiar emission lines.