278 citations · 542 across the 6 of their papers we have counts for
6 papers
Line and Continuum Variability in Active Galaxies
Y. E. Rashed, A. Eckart, M. Valencia-S. +5
We compared optical spectroscopic and photometric data for 18 AGN galaxies over 2 to 3 epochs, with time intervals of typically 5 to 10 years. We used the Multi-Object Double Spect…
Chandra and MMT observations of low-mass black hole active galactic nuclei accreting at low rates in dwarf galaxies
W. Yuan, H. Zhou, L. Dou +3
We report on Chandra X-ray observations of four candidate low-mass black hole (<10^6Msun) active galactic nuclei (AGNs) that have the estimated Eddington ratios among the lowest (~…
A comparative study of optical/ultraviolet variability of narrow-line Seyfert 1 and broad-line Seyfert 1 active galactic nuclei
Y. L. Ai, W. Yuan, H. Zhou +4
The ensemble optical/ultraviolet variability of narrow-line Seyfert 1 (NLS1) type active galactic nuclei (AGNs) is investigated, based on a sample selected from the Sloan Digital S…
Evolution of tidal disruption candidates discovered by XMM-Newton
P. Esquej, R. D. Saxton, S. Komossa +8
It has been demonstrated that active galactic nuclei are powered by gas accretion onto supermassive black holes located at their centres. The paradigm that the nuclei of inactive g…
A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
W. Yuan, H. Y. Zhou, S. Komossa +4
(abridged) We present a comprehensive study of a sample of 23 genuine radio-loud NLS1 galaxies which have the radio-loudness parameters greater than 100. The radio sources of the s…
Strong CaII absorption lines in the reddened quasar SDSS J23390912: Evidence of the collision/merger in the host galaxy?
Tinggui Wang, Xiaobo Dong, Hongyan Zhou +1
We report the detection of strong CaII/MgII absorption lines at the quasar redshift in the narrow line quasar SDSS J2339-0912 (z=0.6604). The quasar exhibits strong FeII, small Bal…