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6 papers · 2 filters
A note on black hole masses estimated by the second moment in Narrow Line Seyfert 1 Galaxies
Wei-Hao Bian, Chen Hu, Qiu-Sheng Gu +1
The second moment of the H emission line is calculated for 329 narrow line Seyfert 1 galaxies (NLS1s) selected from the Sloan Digital Sky Survey (SDSS), which is used to calcula…
Hbeta Profiles in Quasars: Evidence for an Intermediate-line Region
Chen Hu, Jian-Min Wang, Luis C. Ho +3
We report on a systematic investigation of the Hbeta and Fe II emission lines in a sample of 568 quasars within z < 0.8 selected from the Sloan Digital Sky Survey. The conventional…
A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow to the Central Black Hole
Chen Hu, Jian-Min Wang, Luis C. Ho +4
Broad Fe II emission is a prominent feature of the optical and ultraviolet spectra of quasars. We report on a systematical investigation of optical Fe II emission in a large sample…
Supermassive Black Hole Masses in Type II Active Galactic Nuclei with Polarimetric Broad Emission Lines
Shi-Yan Zhang, Wei-Hao Bian, Ke-Liang Huang
Type II AGNs with polarimetric broad emission line provided strong evidence for the orientation-based unified model for AGNs. We want to investigate whether the polarimetric broad…
The Origin and Evolution of \civ Baldwin Effect in QSOs from the Sloan Digital Sky Survey
Yan Xu, Wei-Hao Bian, Qi-Rong Yuan +1
Using a large sample of 26623 quasars with redshifts in the range with \civ 1549 Åemission line in Fifth Data Release of the Sloan Digital Sky Survey (SDSS),…
The radio luminosity, black hole mass and Eddington ratio for quasars from the Sloan Digital Sky Survey
Wei-Hao. Bian, Yan-Mei. Chen, Chen. Hu +2
We investigate the $\mbh- σ_*$ relation for radio-loud quasars with redshift in Data Release 3 of the Sloan Digital Sky Survey (SDSS). The sample consists of 3772 quasars…