The spectral decomposition of Active Galactic Nuclei with double-peaked Balmer lines from SDSS

For a sample of 52 double-peaked broad-lines AGNs from the Sloan Digital Sky Survey (SDSS), we do the spectral decomposition to obtain the host spectrum and the nuclei spectrum from their SDSS spectra, as well as the bulge luminosity (L_bulge), stellar velocity dispersion (σ_*). A strong correlation is found between the σ_* and the gaseous velocity dispersion in narrow line regions. With the M_bh − σ_* relation, we estimate the black hole masses, range from 1.0 × 10⁷ to 6 × 10⁸ M_⊙, and the Eddington ratio from about 0.01 to about 1. It is consistent with the result from M_bh − L_bulge relation. However, it is not consistent with the mass from the Hβ FWHM. It seems that the empirical size-luminosity relation for broad line regions dose not hold for double-peaked AGNs, otherwise the calibration factor is as small as 0.185, suggesting the non-virial dynamics of broad line regions.