your ID: 0189 
First Name: Weimin 
Last Name: Yuan 
Affiliation: National Astronomical Observatories/Yunnan Observatory, CAS 

Title: Systematic study of a large sample of NLS1 galaxies from SDSS: 
first results
Authors: W. Yuan, H.Y. Zhou, T.G. Wang,  H.L. Lu, X.B. Dong, J.X. Wang, Y. Lu
Topic: 1 
Session: oral 

Abstract: We report on first results obtained from a systematic study of NLS1 galaxies
by making use of the SDSS data. We have compiled a large sample of 
NLS1s (Zhou et al. astro-ph/0603759) which comprises ~2200 objects selected 
by examining their spectral parameters derived from SDSS DR3 data. 
We present some preliminary results on the statistic properties of the sample, 
such as the fraction of NLS1, the properties of broad and narrow emission lines, 
and emission in the other wavebands. The black hole mass -- velocity
dispersion relation for NLS1s was re-examined using the velocity
dispersion values estimated from the stellar absorption spectra of 
the host galaxies.