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

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