Imprints of the large-scale structure on AGN formation and evolution
  Black hole masses are found to correlate with several global properties of
their host galaxies, suggesting that black holes and galaxies have an
intertwined evolution and that active galactic nuclei (AGN) have a significant
impact on galaxy evolution. Since the large-scale environment can also affect
AGN, this work studies how their formation and properties depend on the
environment. We have used a reconstructed three-dimensional high-resolution
density field obtained from a Bayesian large-scale structure reconstruction
method applied to the 2M++ galaxy sample. A web-type classification relying on
the shear tensor is used to identify different structures on the cosmic web,
defining voids, sheets, filaments, and clusters. We confirm that the
environmental density affects the AGN formation and their properties. We found
that the AGN abundance is equivalent to the galaxy abundance, indicating that
active and inactive galaxies reside in similar dark matter halos. However,
occurrence rates are different for each spectral type and accretion rate. These
differences are consistent with the AGN evolutionary sequence suggested by
previous authors, Seyferts and Transition objects transforming into LINERs
(Low-Ionization Nuclear Emission Line Regions), the weaker counterpart of
Seyferts. We conclud that AGN properties depend on the environmental density
more than on the web-type. More powerful starbursts and younger stellar
populations are found in high densities, where interactions and mergers are
more likely. AGN hosts show smaller masses in clusters for Seyferts and
Transition objects, which might be due to gas stripping. In voids, the AGN
population is dominated by the most massive galaxy hosts.
