J. Wilms
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View article: Modeling X-ray photon pile-up with a normalizing flow
Modeling X-ray photon pile-up with a normalizing flow Open
The dynamic range of imaging detectors flown on-board X-ray observatories often only covers a limited flux range of extrasolar X-ray sources. The analysis of bright X-ray sources is complicated by so-called pile-up, which results from high…
View article: Pulse profile modelling of the accretion-powered millisecond pulsar SAX J1808.4−3658 using NICER data from its 2019 and 2022 outbursts
Pulse profile modelling of the accretion-powered millisecond pulsar SAX J1808.4−3658 using NICER data from its 2019 and 2022 outbursts Open
Pulse profile modelling is a relativistic ray-tracing technique that has provided constraints on parameters, with a focus on mass and radius, of five rotation-powered millisecond pulsars. While the technique can also be applied to accretio…
View article: Pulse profile modelling of the accretion-powered millisecond pulsar SAX J1808.4-3658 using NICER data from its 2019 and 2022 outbursts
Pulse profile modelling of the accretion-powered millisecond pulsar SAX J1808.4-3658 using NICER data from its 2019 and 2022 outbursts Open
Pulse profile modelling is a relativistic ray-tracing technique that has provided constraints on parameters, with a focus on mass and radius, of five rotation-powered millisecond pulsars. While the technique can also be applied to accretio…
View article: Search for Diffuse Galactic Neutrinos with the Full ANTARES Telescope Dataset
Search for Diffuse Galactic Neutrinos with the Full ANTARES Telescope Dataset Open
The diffuse emission of gamma-rays and neutrinos, produced by interactions of cosmic rays with interstellar matter in the Milky Way, provides valuable insights into cosmic ray propagation and Galactic processes. Emission models incorporati…
View article: Relativistic reflection within an extended hot plasma geometry
Relativistic reflection within an extended hot plasma geometry Open
Reflection of X-rays at the inner accretion disk around black holes imprints relativistically broadened features in the observed spectrum. Besides the black hole properties and the ionization and density of the accretion disk the features …
View article: Deep XMM-Newton observation reveals hot gaseous outflow in NGC 5746
Deep XMM-Newton observation reveals hot gaseous outflow in NGC 5746 Open
Context. We present a deep XMM-Newton observation of the massive, edge-on galaxy NGC 5746. The total exposure time of 250 ks provides unprecedented sensitivity to study the diffuse hot gas in the halo, significantly surpassing the depth of…
View article: The Most Distant <i>γ</i>-Ray Flare to Date: A Multiwavelength Campaign on the <i>z</i> = 4.715 Blazar GB6 B1428+4217
The Most Distant <i>γ</i>-Ray Flare to Date: A Multiwavelength Campaign on the <i>z</i> = 4.715 Blazar GB6 B1428+4217 Open
In 2023 November, the Fermi Large Area Telescope detected a γ -ray flare from the high-redshift blazar GB6 B1428+4217 ( z = 4.715). We initiated a multiwavelength follow-up campaign involving Swift, NuSTAR, the Sierra Nevada and Perkins Ob…
View article: Multiwavelength study of extreme variability in LEDA 1154204: A changing-look event in a type 1.9 Seyfert
Multiwavelength study of extreme variability in LEDA 1154204: A changing-look event in a type 1.9 Seyfert Open
Context. Multiwavelength studies of transients in actively accreting supermassive black holes have revealed that large-amplitude variability is frequently linked to significant changes in the optical spectra. This phenomenon is known as a …
View article: X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406
X-Ray Spectral Variability as a Probe of Multimessenger Emission in Blazar 5BZB J0630−2406 Open
X-ray observations are essential for understanding the multimessenger emission mechanisms of active galactic nuclei (AGN). Blazars, a subset of AGN whose X-ray emission predominantly originates from relativistic jets, have been proposed as…
View article: Long-term variability of Cygnus X−1. IX. A spectral-timing comparison of Cygnus X−1 and MAXI J1820+070 in the hard state
Long-term variability of Cygnus X−1. IX. A spectral-timing comparison of Cygnus X−1 and MAXI J1820+070 in the hard state Open
Cygnus X−1 is a persistent, high-mass black hole X-ray binary (BHXRB) which in the hard state shows many similar properties to transient BHXRBs, along with intriguing differences, such as the lack of quasi-periodic oscillations. Here, we c…
View article: Modelling the selection of galaxy groups with end-to-end simulations
Modelling the selection of galaxy groups with end-to-end simulations Open
Context. Feedback from supernovae and active galactic nuclei (AGN) shapes the galaxy formation and evolution, but its impact remains unclear. Galaxy groups offer a crucial probe to determine this impact because their gravitational binding …
View article: Photoionization of Trans-Fe Ions: Se IV, Se V, and Se VI
Photoionization of Trans-Fe Ions: Se IV, Se V, and Se VI Open
In the present study, the photoionization cross-sections are calculated for the trans-Fe ions Se IV, Se V, and Se VI over a wide energy region for ground and meta-stable states within the Dirac Atomic R-matrix approach (darc). Our cross-se…
View article: A hidden quasi-periodic oscillation in Cygnus X-1 revealed by NICER
A hidden quasi-periodic oscillation in Cygnus X-1 revealed by NICER Open
Context. Cygnus X-1 is a high-mass black hole binary system that has been extensively studied across multiple wavelengths since its discovery in 1964. Its rapid temporal and spectral variability in X-rays offer critical insights into the p…
View article: Laboratory Measurements of <i>n</i> >= 3 K-shell Transition Energies of Sulfur Ions from F-like S <scp>viii</scp> to Li-like S <scp>xiv</scp>
Laboratory Measurements of <i>n</i> >= 3 K-shell Transition Energies of Sulfur Ions from F-like S <span>viii</span> to Li-like S <span>xiv</span> Open
Inner-shell transitions are ubiquitous in nonequilibrium collisionally ionized plasmas, such as supernova remnants, and in photoionized plasmas, such as outflows from active galactic nuclei and X-ray binaries. Inner-shell X-ray emission ca…
View article: The X-ray Integral Field Unit at the end of the Athena reformulation phase
The X-ray Integral Field Unit at the end of the Athena reformulation phase Open
View article: The X-ray Integral Field Unit at the end of the Athena reformulation phase
The X-ray Integral Field Unit at the end of the Athena reformulation phase Open
The Athena mission entered a redefinition phase in July 2022, driven by the imperative to reduce the mission cost at completion for the European Space Agency below an acceptable target, while maintaining the flagship nature of its science …
View article: Multi-wavelength study of 1eRASS J085039.9−421151 with eROSITA, <i>NuSTAR</i>, and X-shooter
Multi-wavelength study of 1eRASS J085039.9−421151 with eROSITA, <i>NuSTAR</i>, and X-shooter Open
The eROSITA instrument on board Spectrum-Roentgen-Gamma (SRG) has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 alone, including multiple new X-ray binary candidates. We repor…
View article: X-Ray emission from SN1885A
X-Ray emission from SN1885A Open
The historical supernova (SN) S Andromedae (S And or SN1885A) in the Andromeda Galaxy (M31) was discovered in August 1885 and since then has been studied extensively in multi-wavelength observations. Although the remnant of S And could be …
View article: The first all-sky survey of star-forming galaxies with eROSITA
The first all-sky survey of star-forming galaxies with eROSITA Open
Context. In this work, we present the results from a study of X-ray normal galaxies, that is, galaxies not harbouring active galactic nuclei (AGN), using data from the first complete all-sky scan of the eROSITA X-ray survey (eRASS1) obtain…
View article: The high energy X-ray probe (HEX-P): science overview
The high energy X-ray probe (HEX-P): science overview Open
To answer NASA’s call for a sensitive X-ray observatory in the 2030s, we present the High Energy X-ray Probe (HEX-P) mission concept. HEX-P is designed to provide the required capabilities to explore current scientific questions and make n…
View article: Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter
Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter Open
The eROSITA instrument on board Spectrum-Roentgen-Gamma has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 only, including multiple new X-ray binary candidates. We report on an…
View article: Sharp Periodic Flares and Long-term Variability in the High-mass X-Ray Binary XTE J1829−098 from RXTE PCA, Swift BAT, and MAXI Observations
Sharp Periodic Flares and Long-term Variability in the High-mass X-Ray Binary XTE J1829−098 from RXTE PCA, Swift BAT, and MAXI Observations Open
XTE J1829−098 is a transient X-ray pulsar with a period of ∼7.8 s. It is a candidate Be star system, although the evidence for this is not yet definitive. We investigated the twenty-year-long X-ray light curve using the Rossi X-ray Timing …
View article: Characterisation of the stellar wind in Cyg X-1 via modelling of colour-colour diagrams
Characterisation of the stellar wind in Cyg X-1 via modelling of colour-colour diagrams Open
Context. Cygnus X-1 (Cyg X-1) is a high-mass X-ray binary where accretion onto the black hole (BH) is mediated by the stellar wind from the blue supergiant companion star HDE 226868. Due to its inclination, the system is a perfect laborato…
View article: A Gamma-Ray Flare from TXS 1508+572: Characterizing the Jet of a z = 4.31 Blazar in the Early Universe
A Gamma-Ray Flare from TXS 1508+572: Characterizing the Jet of a z = 4.31 Blazar in the Early Universe Open
Blazars can be detected from very large distances due to their high luminosity. However, the detection of γ -ray emission of blazars beyond z = 3 has only been confirmed for a small number of sources. Such observations probe the growth of …
View article: An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9-385922 as detected with eROSITA
An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9-385922 as detected with eROSITA Open
Extreme continuum variability in AGNs can indicate extreme changes in accretion flows onto supermassive black holes. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B040659.9$-$385922. The all-sky X-ray surve…
View article: An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9–385922 as detected with eROSITA
An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9–385922 as detected with eROSITA Open
Context. Extreme continuum variability in extragalactic nuclear sources can indicate extreme changes in accretion flows onto supermassive black holes. Aims. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B04…
View article: The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn
The SRG/eROSITA All-Sky Survey: X-ray beacons at late cosmic dawn Open
Context. The Spektrum-Roentgen-Gamma (SRG)/extended Roentgen Survey with an Imaging Telescope Array (eROSITA) All-Sky Survey (eRASS) is expected to contain ∼100 quasars that emitted their light when the universe was less than a billion yea…
View article: eROSITA(eRASS1) study of the Canis Major overdensity: Developing a multi-wavelength algorithm for classifying faint X-ray sources
eROSITA(eRASS1) study of the Canis Major overdensity: Developing a multi-wavelength algorithm for classifying faint X-ray sources Open
Using data from Roentgen Survey with an Imaging Telescope Array) on board Spektrum-Roentgen-Gamma (Spektr-RG, SRG) taken during the first all-sky survey (eRASS1), we performed the first X-ray classification and population study in the fiel…
View article: Characterisation of the stellar wind in Cyg X-1 via modelling of colour-colour diagrams
Characterisation of the stellar wind in Cyg X-1 via modelling of colour-colour diagrams Open
Cygnus X-1 is a high mass X-ray binary where accretion onto the black hole is mediated by the stellar wind from the blue supergiant companion star HDE 226868. Depending on the position of the black hole along the orbit, X-ray observations …
View article: The giant outburst of EXO 2030+375
The giant outburst of EXO 2030+375 Open
The Be X-ray binary EXO 2030+375 went through its third recorded giant outburst from June 2021 to early 2022. We present the results of both spectral and timing analysis based on NICER monitoring, covering the 2−10 keV flux range from 20 t…