Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
Relativistic reflection features are commonly observed in the X-ray spectra of accreting black
holes. In the presence of high quality data and with the correct astrophysical model, X-ray …
holes. In the presence of high quality data and with the correct astrophysical model, X-ray …
Explaining changing-look AGN with state transition triggered by rapid mass accretion rate drop
We model the broad-band (optical/UV and X-ray) continuum spectrum of the 'changing-
look'active galactic nucleus (AGN) Mrk 1018, as it fades from Seyfert 1 to 1.9 in∼ 8 years …
look'active galactic nucleus (AGN) Mrk 1018, as it fades from Seyfert 1 to 1.9 in∼ 8 years …
A physical model of the broad-band continuum of AGN and its implications for the UV/X relation and optical variability
A Kubota, C Done - Monthly Notices of the Royal Astronomical …, 2018 - academic.oup.com
We develop a new spectral model for the broad-band spectral energy distribution (SED) of
active galactic nuclei (AGN). This includes an outer standard disc, an inner warm …
active galactic nuclei (AGN). This includes an outer standard disc, an inner warm …
Radiation spectra of warm and optically thick coronae in AGNs
PO Petrucci, D Gronkiewicz, A Rozanska… - Astronomy & …, 2020 - aanda.org
A soft X-ray excess above the 2–10 keV power-law extrapolation is generally observed in
the X-ray spectra of active galactic nuclei. The origin of this excess is still not well …
the X-ray spectra of active galactic nuclei. The origin of this excess is still not well …
Implications of the warm corona and relativistic reflection models for the soft excess in mrk 509
We present the analysis of the first Nuclear Spectroscopic Telescope Array observations (∼
220 ks), simultaneous with the last Suzaku observations (∼ 50 ks), of the active galactic …
220 ks), simultaneous with the last Suzaku observations (∼ 50 ks), of the active galactic …
UV/Optical disk thermal reverberation in active galactic nuclei: an in-depth study with an analytic prescription for time-lag spectra
Several active galactic nuclei show correlated variations in the UV/optical range, with time
delays increasing at longer wavelengths. Thermal reprocessing of the X-rays illuminating …
delays increasing at longer wavelengths. Thermal reprocessing of the X-rays illuminating …
A NuSTAR census of coronal parameters in Seyfert galaxies
Context. We discuss the results of the hot corona parameters of active galactic nuclei (AGN)
that have been recently measured with NuSTAR. The values taken from the literature of a …
that have been recently measured with NuSTAR. The values taken from the literature of a …
Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: A moderate changing-state AGN?
D Porquet, S Hagen, N Grosso, A Lobban… - Astronomy & …, 2024 - aanda.org
Context. The X-ray broadband spectra of the bare active galactic nucleus (AGN) Mrk 110,
obtained by simultaneous XMM-Newton and NuSTAR observations performed in November …
obtained by simultaneous XMM-Newton and NuSTAR observations performed in November …
Changing-look event in NGC 3516: continuum or obscuration variability?
M Mehdipour, GA Kriss, LW Brenneman… - The Astrophysical …, 2022 - iopscience.iop.org
The Seyfert-1 galaxy NGC 3516 has undergone major spectral changes in recent years. In
2017 we obtained Chandra, NuSTAR, and Swift observations during its new low-flux state …
2017 we obtained Chandra, NuSTAR, and Swift observations during its new low-flux state …
Estimating black hole spin from AGN SED fitting: the impact of general-relativistic ray tracing
S Hagen, C Done - Monthly Notices of the Royal Astronomical …, 2023 - academic.oup.com
Accretion disc model fitting to optical/UV quasar spectra requires that the highest mass black
holes have the highest spin, with implications on the hierarchical growth of supermassive …
holes have the highest spin, with implications on the hierarchical growth of supermassive …