148 citations · 2.9k across the 72 of their papers we have counts for
4 papers · 1 filter
Optical and X-ray discovery of the changing-look AGN IRAS23226-3843 showing extremely broad and double-peaked Balmer profiles
W. Kollatschny, D. Grupe, M. L. Parker +6
We detected a very strong X-ray decline in the galaxy IRAS23226-3843 within the XMM-Newton slew survey in 2017. Subsequently, we carried out multi-band follow-up studies to investi…
Swift, NuStar and XMM-Newton observations of the NLS1 galaxy RX J2317.8-4422 in an extreme X-ray low flux state
Dirk Grupe, S. Komossa., Luigi Gallo +6
We report the discovery of RX J2317.8-4422 in an extremely low X-ray flux state by the Neil Gehrels Swift observatory in 2014 April/May. In total, the low-energy X-ray emission dro…
The XMM-Newton/HST view of the obscuring outflow in the Seyfert Galaxy Mrk 335 observed at extremely low X-ray flux
Anna Lia Longinotti, Gerard Kriss, Yair Krongold +8
The Seyfert Galaxy Mrk 335 is known for its frequent changes of flux and spectral shape in the X-ray band occurred during recent years. These variations may be explained by the ons…
The view of AGN-host alignment via reflection spectroscopy
Matthew J. Middleton, Michael L. Parker, Christopher S. Reynolds +2
The fuelling of active galactic nuclei (AGN) - via material propagated through the galactic disc or via minor mergers - is expected to leave an imprint on the alignment of the sub-…