Capturing dual AGN activity and kiloparsec-scale outflows in IRAS
  20210+1121
  The most accepted scenario for the evolution of massive galaxies across
cosmic time predicts a regulation based on the interplay between AGN feedback,
which injects large amounts of energy in the host environment, and galaxy
mergers, being able to trigger massive star formation events and accretion onto
the supermassive black holes. Interacting systems hosting AGN are useful
laboratories to get key insights into both phenomena. In this context, we
present the analysis of the optical spectral properties of IRAS 20210+1121
(I20210), a merging system at $z = 0.056$. According to X-ray data, this object
comprises two interacting galaxies, each hosting an obscured AGN. The optical
spectra confirm the presence of AGN features in both galaxies. In particular,
we are able to provide a Seyfert classification for I20210 North. The spectrum
of I20120 South shows broad blueshifted components associated with the most
intense emission lines that indicate the presence of an ionized outflow, for
which we derive a maximum velocity of $\sim$2000 km s$^{-1}$, an extension of
$\sim$2 kpc and a mass rate of $\sim$0.6 M$_\odot$ yr$^{-1}$. We also report
the existence of an ionized nebular component with $v \sim 1000$ km s$^{-1}$ at
$\sim$6.5 kpc Southwards of I20210 South, that can be interpreted as disrupted
gas ejected from the host galaxy by the action of the outflow. I20120 therefore
exhibits a double obscured AGN, with one of them showing evidence of ongoing
events for AGN-powered outflows. Future spatially-resolved spectroscopy will
allow to accurately map on the gas kinematics in this AGN pair and evaluate the
impact of the outflow on both the interstellar medium and galaxy environment.
