Black Hole Mass Estimation in Type 1 AGN: H$\beta$ vs. Mg II lines and the role of Balmer continuum

Here we investigate the H$\beta$ and Mg II spectral line parameters used for the black hole mass (M${}_{\mathrm{B}\mathrm{H}}$) estimation for a sample of Type 1 Active Galactic Nuclei (AGN) spectra selected from the Sloan Digital Sky Survey (SDSS) database. We have analyzed and compared the virialization of the H$\beta$ and Mg II emission lines, and found that the H$\beta$ line is more confident virial estimator than Mg II. We have investigated the influence of the Balmer continuum emission to the M${}_{\mathrm{B}\mathrm{H}}$ estimation from the UV parameters, and found that the Balmer continuum emission can contribute to the overestimation of the M${}_{\mathrm{B}\mathrm{H}}$ on average for ~ 5% (up to 10%).