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astro-ph2004
The mass estimate in narrow-line Seyfert 1 galaxies
W. Bian, Y. Zhao
It is possible that narrow-line Seyfert 1 galaxies (NLS1s) are in the early stage of active galactic nuclei (AGNs) evolution. It is important to estimate the mass of supermassive b…
astro-ph2003
On X-ray variability in narrow line and broad line AGNs
W. Bian, Y. Zhao
We assembled a sample of broad line and narrow lines AGNs observed by ASCA, whose excess variances have been determined. The central black hole masses in this sample can be obtaine…