Our publications
01/02/2026 - High-Energy
A XRISM/Resolve View of the Dynamics in the Hot Gaseous Atmosphere of M87
The XRISM/Resolve microcalorimeter directly measured the gas velocities in the core of the Virgo Cluster, the closest example of active galactic nucleus (AGN) feedback in a cluster. This proximity allows us to resolve the kinematic impact of feedback on scales down to 5 kpc. Our spectral analysis reveals a high velocity dispersion of σv=262−38+45 km…
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01/02/2026 - Low-Energy
Active galactic nucleus─host galaxy photometric decomposition using a fast, accurate, and precise deep learning approach
Aims. The identification of active galactic nuclei (AGNs) is extremely important for understanding galaxy evolution and its connection with the assembly of supermassive black holes (SMBHs). With the advent of deep- and high-angular-resolution imaging surveys such as those conducted with the James Webb Space Telescope (JWST), it is now possible to identify galaxies with a…
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01/02/2026 - High-Energy
Delving into the depths of NGC 3783 with XRISM: IV. Mapping of the accretion flow with Fe Kα emission lines
Using XRISM/Resolve 439 ks time-averaged spectra of the well-known Seyfert-1.5 active galactic nucleus (AGN) in NGC 3783, we investigated the nature of the Fe Kα emission line at 6.4 keV, the strongest and most common X-ray line observed in AGNs. Even the narrow component of the line is resolved with evident Fe Kα1 (6.404 keV)…
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01/02/2026 - High-Energy
XRISM view of a stellar flare: High-resolution Fe K spectra of HR 1099, an RS CVn-type star
A high-resolution X-ray spectroscopic observation was made of the RS CVn-type binary star HR 1099 using the Resolve instrument onboard XRISM for its calibration purposes. During the $sim$400 ks telescope time covering 1.5 binary orbit, a flare lasting for $sim$100 ks was observed with a released X-ray radiation energy of ${sim }10^{34}$ erg, making it…
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01/02/2026 - High-Energy
Chemical composition and enrichment of the Centaurus cluster core seen by XRISM/Resolve
Context. Hot, X-ray emitting atmospheres pervading galaxy clusters (and groups) are rich in metals, which have been synthesised and released by asymptotic giant branch (AGB) stars, core-collapse supernovae (SNcc), and Type Ia supernovae (SNIa) over cosmic history. This makes the intracluster medium (ICM) an ideal astrophysical system to constrain its chemical composition, and hence ultimately…
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01/01/2026 - High-Energy
The Feasibility of Using Fe XXIII Metastable Transitions as a Density Diagnostic for Low-mass X-Ray Binary Disk Winds
Low-mass X-ray binaries (LMXBs) occasionally show signs of outflowing material from the accretion disk. Studying these outflows can inform the understanding of the geometry of the systems, as well as the dynamics and energetics of accretion. One key variable for determining the location of these disk winds is the density of the outflowing material. In…
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Michael Wise
General and Scientific Director of SRON (Prof. Dr.)
“To work at an institute at the forefront of new technology, new space missions and new answers to scientific questions is incredibly inspiring.”
