5 papers
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…
The spectral variability of FSRQs
Minfeng Gu, Y. L. Ai
The optical variability of 29 flat spectrum radio quasars in SDSS Stripe 82 region are investigated by using DR7 released multi-epoch data. All FSRQs show variations with overall a…
The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region
Minfeng Gu, Y. L. Ai
Context. Although a bluer-when-brighter trend is commonly observed in blazars, the opposite trend of redder-when-brighter has also been found in some blazars. Aims. We investigate…
X-Ray Properties of Narrow-Line Seyfert 1 Galaxies with Very Small Broad-Line Widths
Y. L. Ai, W. Yuan, H. Y. Zhou +2
Narrow-line Seyfert\,1 galaxies (NLS1s) with very small broad-line widths (say, FWHM(\hb) $\la $ 1200\,\kms) represent the extreme type of Seyfert\,1 galaxies that have small black…
Dependence of the optical/UV variability on the emission line properties and Eddington ratio in active galactic nuclei
Y. L. Ai, W. Yuan, H. Y. Zhou +4
The dependence of the long-term optical/UV variability on the spectral and the fundamental physical parameters for radio-quiet active galactic nuclei (AGNs) is investigated. The mu…