More Evidence for the Intermediate Broad Line Region of the Mapped AGN PG 0052+251

Abstract

In the manuscript, the properties of the proposed intermediate BLR are checked for the mapped AGN PG 0052+251. With the considerations of the apparent effects of the broad He {\sc ii} line on the observed broad H$\beta$ profile, the line parameters (especially the line width and the line flux) of the observed broad H$\alpha$ and the broad H$\beta$ are carefully determined. Based on the measured line parameters, the model with two broad components applied for each observed broad balmer line is preferred, and then confirmed by the calculated much different time lags for the inner/intermediate broad components and the corresponding virial BH masses ratio determined by the properties of the inner and the intermediate broad components. Then, the correlation between the broad line width and the broad line flux is checked for the two broad components: one clearly strong negative correlation for the inner broad component, but one positive correlation for the intermediate broad component. The different correlations for the two broad components strongly support the intermediate BLR of PG0052+251.

17 pages, 1 table, 9 figures, accepted and to be published in MNRAS

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• Are broad optical balmer lines from central accretion disk in PG 1613+658?
• Optical spectral index - luminosity relation for the 17 mapped Palomar-Green quasars
• Strong Optical and UV Intermediate-Width Emission Lines in the Quasar SDSS J232444.80-094600.3: Dust-Free and Intermediate-Density Gas at the Skin of Dusty Torus ?