347 citations · 377 across the 2 of their papers we have counts for
8 papers · 1 filter
A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample
Hongyan Zhou, Tinggui Wang, Weimin Yuan +4
This is the first paper in a series dedicated to the study of the emission-line and continuum properties of narrow line Seyfert 1 galaxies (NLS1s). We carried out a systematic sear…
Evidence for a population of beamed radio intermediate quasars
Tinggui Wang, Hongyan Zhou, Junxian Wang +2
Whether radio intermediate quasars possess relativistic jets as radio-loud quasars is an important issue in the understanding of the origin of radio emission in quasars. In this le…
Probing the precession of the inner accretion disk in Cygnus X-1
Diego F. Torres, Gustavo E. Romero, Xavier Barcons +1
We show that changes in the orientation of the inner accretion disk of Cygnus X-1 affect the shape of the broad Fe K emission line emitted from this object, in such a way that e…
Evolution of accretion disks around massive black holes: constraints from the demography of active galactic nuclei
Qingjuan Yu, Youjun Lu, Guinevere Kauffmann
Observations have shown that the Eddington ratios (the ratio of the bolometric luminosity to the Eddington luminosity) in QSOs/active galactic nuclei (AGNs) cover a wide range. In…
The Strömgren sphere, the environment and the reionization in the local universe of the highest redshift QSOs
Qingjuan Yu, Youjun Lu
In this paper we investigate the environment and reionization process around the highest redshift QSOs having Gunn-Peterson troughs (z>6.1). Starting with the cosmic density pertur…
The black hole mass versus velocity dispersion relation in QSOs/Active Galactic Nuclei: observational appearance and black hole growth
Qingjuan Yu, Youjun Lu
Studies of massive black holes (BHs) in nearby galactic centers have revealed a tight correlation between BH mass and galactic velocity dispersion. In this paper we investigate how…