Abstract
A new relation is presented to estimate the virial BH masses of AGN with broad double-peaked low-ionization emission lines (hereafter, dbp emitters). A discussion is given on the adequate parameter to trace the local velocity of the Broad line Region (BLR), and the determination of the size of the BLR (its distance to the ionizing source) for dbp emitters. We select 17 dbp emitters from SDSS with measurable stellar absorption lines to determine BH masses from stellar dispersion velocities, and compare with our virial masses. We confirm a previous result that the relations to estimate virial BH masses for ``normal'' AGN are not appropriate for dbp emitters (Zhang, Dultzin-Hacyan, & Wang 2007).
