Polarization in broad emission lines of Active Galactic Nuclei
  We discuss the polarization of broad emission lines in the type 1 active
galactic nuclei (AGNs). The polarization depends on the geometry of the broad
line region (BLR), and also on the polarization mechanism, or distribution of
the scattering material. Therefore the polarization measurements can indicate
the geometry of the BLR and the mechanism of polarization (equatorial or polar
scattering). In addition, the polarization angle (PA) shape across the line
profile can be used to measure the supermassive black hole (SMBH) mass, and
constrain the BLR characteristics. We give an overview of ours and other recent
investigations of the polarization in broad lines from both aspects:
theoretical and observational.
