148 citations · 2.9k across the 72 of their papers we have counts for
72 papers
MOMO VI: Multifrequency radio variability of the blazar OJ 287 from 2015-2022, absence of predicted 2021 precursor-flare activity, and a new binary interpretation of the 2016/2017 outburst
S. Komossa, A. Kraus, D. Grupe +12
Based on our dedicated Swift monitoring program, MOMO, OJ 287 is one of the best-monitored blazars in the X-ray--UV--optical regime. Here, we report results from our accompanying,…
The outburst of the changing-look AGN IRAS23226-3843 in 2019
Wolfram Kollatschny, Dirk Grupe, Michael L. Parker +8
IRAS23226-3843 has previously been classified as a changing-look AGN based on X-ray and optical spectral variations. In 2019, Swift observations revealed a strong rebrightening in…
Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO
S. Komossa, A. Kraus, D. Grupe +19
We are carrying out the densest and longest multiyear, multiwavelength monitoring project of OJ 287 ever done. The project MOMO (Multiwavelength Observations and Modelling of OJ 28…
A Disc Reflection Model for Ultra-Soft Narrow-Line Seyfert 1 Galaxies
Jiachen Jiang, Luigi C. Gallo, Andrew C. Fabian +2
We present a detailed analysis of the XMM-Newton observations of five narrow-line Seyfert 1 galaxies (NLS1s). They all show very soft continuum emission in the X-ray band with a ph…
A NuSTAR and Swift View of the Hard State of MAXI J1813-095
Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser +9
We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of…
XMM-Newton Observations of the Narrow-Line Seyfert 1 Galaxy IRAS 132243809 : X-ray Spectral Analysis II
Jiachen Jiang, Thomas Dauser, Andrew C. Fabian +4
Previously, we modelled the X-ray spectra of the narrow-line Seyfert 1 galaxy IRAS 132243809 using a disc reflection model with a fixed electron density of cm.…