Data-driven dissection of emission-line regions in Seyfert galaxies
  Indirectly resolving the line-emitting gas regions in distant Active Galactic
Nuclei (AGN) requires both high-resolution photometry and spectroscopy (i.e.
through reverberation mapping). Emission in AGN originates on widely different
scales; the broad-line region (BLR) has a typical radius less than a few
parsec, the narrow-line region (NLR) extends out to hundreds of parsecs. But
emission also appears on large scales from heated nebulae in the host galaxies
(tenths of kpc).
  We propose a novel, data-driven method based on correlations between
emission-line fluxes to identify which of the emission lines are produced in
the same kind of emission-line regions. We test the method on Seyfert galaxies
from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) and Galaxy Zoo
project.
  We demonstrate the usefulness of the method on Seyfert-1s and Seyfert-2
objects, showing similar narrow-line regions (NLRs). Preliminary results from
comparing Seyfert-2s in spiral and elliptical galaxy hosts suggest that the
presence of particular emission lines in the NLR depends both on host
morphology and eventual radio-loudness. Finally, we explore an apparent linear
relation between the final correlation coefficient obtained from the method and
time lags as measured in reverberation mapping for Zw229-015.
