299 citations · 646 across the 23 of their papers we have counts for
5 papers · 1 filter
Evidence for Two Distinct Broad-Line Regions from Reverberation Mapping of PG 0026+129
Chen Hu, Sha-Sha Li, Wei-Jian Guo +17
We report on the results of a new spectroscopic monitoring campaign of the quasar PG 0026+129 at the Calar Alto Observatory 2.2m telescope from July 2017 to February 2020. Signific…
Robotic reverberation mapping of the broad-line radio galaxy 3C 120
Michael Hlabathe, David Starkey, Keith Horne +10
We carried out photometric and spectroscopic observations of the well-studied broad-line radio galaxy 3C 120 with the Las Cumbres Observatory (LCO) global robotic telescope network…
The post-maximum behaviour of the changing-look Seyfert galaxy NGC 1566
V. L. Oknyansky, H. Winkler, S. S. Tsygankov +6
We present results of the long-term multi-wavelength study of optical, UV and X-ray variability of the nearby changing-look (CL) Seyfert NGC 1566 observed with the Swift Observator…
Broad-line Region of the Quasar PG 2130+099 from a Two-Year Reverberation Mapping Campaign with High Cadence
Chen Hu, Yan-Rong Li, Pu Du +12
As one of the most interesting Seyfert 1 galaxies, PG 2130+099 has been the target of several reverberation mapping (RM) campaigns over the years. However, its measured broad H…
Revisiting old (AGN) friends -- what's changed in their spectral looks
Hartmut Winkler
Active Galactic Nuclei (AGN) have long been known to be variable, but the amplitude, timescale and nature of these changes can often differ dramatically from object to object. The…