57 citations · 185 across the 24 of their papers we have counts for
14 papers · 1 filter
Disk reflection as the origin of the X-ray polarization of NGC 4151 with IXPE
E. Kammoun, M. Dovčiak, J. Podgorný +6
We present an X-ray spectro-polarimetric study of the nearby type-1 active galactic nucleus NGC 4151 using two long IXPE observations obtained in 2022 and 2024, supported by simult…
Characterising the X-ray variability of QSOs to the highest Eddington ratios and black hole masses with eROSITA light curves
Antonis Georgakakis, Angel Ruiz, Johannes Buchner +9
An important diagnostic of the inner structure of accretion flows onto supermassive black holes are the stochastic flux variations at X-ray wavelengths. Despite its significance, a…
The X-ray/UV Connection in NGC 5548: A Rapidly Varying Corona
M. Papoutsis, I. E. Papadakis, C. Panagiotou +2
Recent intensive monitoring campaigns of active galactic nuclei (AGN) have provided simultaneous X-ray, UV, and optical data of unprecedented quality. The observations reveal a str…
X-ray reverberation modelling of the observed UV/optical power spectra of quasars
M. Papoutsis, I. E. Papadakis, C. Panagiotou +2
Over the past decade, a significant amount of effort has been put into investigating the ultraviolet (UV) and optical variability of active galactic nuclei (AGNs). Comprehensive st…
Continuum optical-UV and X-ray variability of AGN: current results and future challenges
Maurizio Paolillo, Iossif Papadakis
Active Galactic Nuclei (AGN) are believed to be powered by accretion of matter onto a supermassive black hole. A fundamental ingredient in shaping our understanding of AGN is their…
Exploring the Accretion disc/Corona Connection in NGC 6814: Insights from UV and X-ray spectral-timing studies
Kavita Kumari, I. E. Papadakis, G. C. Dewangan
We conducted a comprehensive spectral and timing analysis of NGC 6814 using AstroSat's 2019 and XMM-Newton's 2021 observations. Cross-correlation analysis revealed a significant co…