77 citations · 448 across the 16 of their papers we have counts for
16 papers
Simultaneous H alpha and dust reverberation mapping of 3C120: Testing the bowl-shaped torus geometry
Michael Ramolla, Martin Haas, Christian Westhues +8
At the Universitaetssternwarte Bochum near Cerro Armazones we have monitored the Seyfert-1 galaxy 3C 120 between September 2014 and March 2015 in BVRI and a narrow band filter cove…
Broad-line region structure and line profile variations in the changing look AGN HE1136-2304
W. Kollatschny, M. W. Ochmann, M. Zetzl +5
A strong X-ray outburst was detected in HE1136-2304 in 2014. Accompanying optical spectra revealed that the spectral type has changed from a nearly Seyfert 2 type (1.95), classifie…
Long-term optical, UV, and X-ray continuum variations in the changing-look AGN HE 1136-2304
M. Zetzl, W. Kollatschny, M. W. Ochmann +6
A strong outburst in the X-ray continuum and a change of its Seyfert spectral type was detected in HE 1136-2304 in 2014. The spectral type changed from nearly Seyfert 2 type (1.95)…
The detection and X-ray view of the changing look AGN HE 1136-2304
M. L. Parker, S. Komossa, W. Kollatschny +9
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfe…
The peculiar optical-UV X-ray spectra of the X-ray weak quasar PG 0043+039
W. Kollatschny, N. Schartel, M. Zetzl +4
The object PG 0043+039 has been identified as a broad absorption line (BAL) quasar based on its UV spectra. However, this optical luminous quasar has not been detected before in de…
Proving strong magnetic fields near to the central black hole in the quasar PG0043+039 via cyclotron lines
W. Kollatschny, N. Schartel, M. Zetzl +3
The optical luminous quasar PG0043+039 has not been detected before in deep X-ray observations indicating the most extreme optical-to-X-ray slope index of all quasars. Thi…