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 \sim 81 ~ { } { km / s } , leading to SDSS J0159 being an apparent outlier in the M _ { BH } - \sigma space , because of the BH mass estimated through the M _ { BH } - \sigma relation about two magnitudes lower than the reported virial BH mass of about 10 ^ { 8 } ~ { } { 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 M _ { BH } - \sigma space could be treated as interesting clues to support central TDEs .