SkyMapper colours of Seyfert galaxies and Changing-look AGN-II. Newly
  discovered Changing-look AGN
  Changing-look Active Galactic Nuclei (CLAGN) are AGN that change type as
their broad emission lines appear or disappear, which is usually accompanied by
strong flux changes inn their blue featureless continuum. We search for Turn-On
CLAGN by selecting type-2 AGN from the spectroscopic 6dF Galaxy Survey, whose
photometry, as observed over a decade later by the SkyMapper Southern Survey,
is consistent with type-1 AGN. Starting from a random sample of 235 known
type-2 AGN we select 18 candidates and confirm 13 AGN to have changed into
type-1 spectra; observations of an incomplete sample reveal nine further
Turn-On CLAGN. While our search was not intended to reliably discover Turn-Off
CLAGN, we discover four such cases as well. This result suggests a Turn-On
CLAGN rate of 12% over ~15 years and imply a total CLAGN rate of ~25% over this
period. Finally, we present observations of AGN that are atypical for the CLAGN
phenomenology, including J1109146 - a CLAGN that did not appear as an AGN in
6dFGS; J1406507 - the second reported Changinglook NLS1; and J1340153 - a CLAGN
with a change timescale of three months.
