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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…
The Chandra Deep Field-South Survey: 2 Ms Source Catalogs
B. Luo, F. E. Bauer, W. N. Brandt +19
We present point-source catalogs for the ~2 Ms exposure of the Chandra Deep Field-South (CDF-S); this is one of the two most-sensitive X-ray surveys ever performed. The survey cove…
Stellar and Dust Properties of Local Elliptical Galaxies: Clues to the Onset of Nuclear Activity
Yu Zhang, Qiusheng Gu, Luis C. Ho
We study the stellar and dust properties of a well-defined sample of local elliptical galaxies to investigate the relationship between host galaxy properties and nuclear activity.…
The accretion ratios in Seyfert 2 galaxies with and without hidden broad-line regions
W. Bian, Q. Gu
Using a large sample of 90 Seyfert 2 galaxies (Sy2s) with spectropolarimetric observations, we tested the suggestion that the presence of hidden broad-line regions (HBLRs) in Sy2s…
Stellar and gaseous velocity dispersions in type II AGNs at 0.3<z<0.83 from the Sloan Digital Sky Survey
W. Bian, Q. Gu, Y. Zhao +2
We apply the stellar population synthesis code by Cid Fernandes et al. to model the stellar contribution for a sample of 209 type II AGNs at from the Sloan Digital Sky…
The K-band properties of Seyfert 2 galaxies
ZhiXin Peng, Qiusheng Gu, Jorge Melnick +1
It is well known that the [O {\sc iii}]5007 emission line and hard X-ray(2-10keV) luminosities are good indicators of AGN activities and that the near and mid-infrared emission…