SDSS J0159 as an outlier in the Mbh-sigma space: further clues to
  support a central tidal disruption event?
  In this Letter, properties of black hole (BH) mass are well checked for the
interesting object SDSS J0159, a changing-look AGN and also a host galaxy of a
tidal disruption event (TDE). Through spectral absorption features, the stellar
velocity dispersion of SDSS J0159 can be well measured as $\sigma\sim81~{\rm
km/s}$, leading to SDSS J0159 being an apparent outlier in the \msig space,
because of the BH mass estimated through the \msig relation about two
magnitudes lower than the reported virial BH mass of about $10^8~{\rm
M_\odot}$. After considerations of contributions of stellar debris from the
central TDE to broad line emission clouds, the over-estimated virial BH mass
could be well explained in SDSS J0159. Therefore, over-estimated virial BH
masses through broad line properties in the \msig space could be treated as
interesting clues to support central TDEs.
