Search Publications
Validation of EUHFORIA cone and spheromak coronal mass ejection models
Mierla, M.; Rodriguez, L.; Poedts, S. +15 more
Aims. We present validation results for calculations of arrival times and geomagnetic impact of coronal mass ejections (CMEs) using the cone and spheromak CME models implemented in EUropean Heliospheric FORecasting Information Asset (EUHFORIA). Validating numerical models is crucial for ensuring their accuracy and performance with respect to real …
SWEET-Cat: A view on the planetary mass-radius relation
Adibekyan, V.; Hoyer, S.; Sousa, S. G. +9 more
Aims. SWEET-Cat (Stars With ExoplanETs Catalog) was originally introduced in 2013, and since then, the number of confirmed exoplanets has increased significantly. A crucial step for a comprehensive understanding of these new worlds is the precise and homogeneous characterization of their host stars. Methods. We used a large number of high-resoluti…
The restless population of bright X-ray sources of NGC 3621
Salvaterra, R.; Tiengo, A.; Marelli, M. +9 more
We report on the multi-year evolution of the population of X-ray sources in the nuclear region of NGC 3621 based on Chandra, XMM-Newton, and Swift observations. Among these, two sources, X1 and X5, after their first detection in 2008, seem to have faded below the detectability threshold, a most interesting fact as X1 is associated with the active …
COSMOS brightest group galaxies: III. Evolution of stellar ages
Finoguenov, A.; Ilbert, O.; Magdis, G. E. +15 more
The unique characteristics of the brightest group galaxies (BGGs) serve as a link in the evolutionary continuum between galaxies such as the Milky Way and the more massive brightest cluster galaxies found in dense clusters. This research investigates the evolution of the stellar properties of BGGs over cosmic time (z = 0.08 ‑ 1.30), extending the …
Testing the flux tube expansion factor - solar wind speed relation with Solar Orbiter data
Maksimovic, M.; Louarn, P.; Démoulin, P. +5 more
Context. The properties of the solar wind measured in situ in the heliosphere are largely controlled by energy deposition in the solar corona, which is in turn closely related to the properties of the coronal magnetic field. Previous studies have shown that long-duration and large-scale magnetic structures show an inverse relation between the sola…
The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope
Botteon, A.; van Weeren, R. J.; Röttgering, H. J. A. +3 more
Radio-mode feedback associated with the active galactic nuclei (AGNs) at the cores of galaxy clusters injects a large amount of energy into the intracluster medium (ICM), offsetting radiative losses through X-ray emission. This mechanism prevents the ICM from rapidly cooling down and fueling extreme starburst activity as it accretes onto the centr…
SRG/eROSITA 3D mapping of the interstellar medium using X-ray absorption spectroscopy
Czesla, S.; Kallman, T. R.; Wilms, J. +6 more
We present a detailed study of the hydrogen density distribution in the local interstellar medium (ISM) using the X-ray absorption technique. Hydrogen column densities were precisely measured by fitting X-ray spectra from coronal sources observed during the initial eROSITA all-sky survey (eRASS1). Accurate distance measurements were obtained throu…
Coupling between magnetic reconnection, energy release, and particle acceleration in the X17.2 2003 October 28 solar flare
Veronig, Astrid M.; Hinterreiter, Jürgen; Fleishman, Gregory D. +3 more
Context. The 2003 October 28 (X17.2) eruptive flare was a unique event. The coronal electric field and the π-decay γ-ray emission flux displayed the highest values ever inferred for solar flares.
Aims: Our aim is to reveal physical links between the magnetic reconnection process, energy release, and acceleration of electrons and ions to high …
Spectral analysis of three hot subdwarf stars: EC 11481-2303, Feige 110, and PG 0909+276. A critical oscillator-strength evaluation for iron-group elements
Rauch, T.; Werner, K.; Landstorfer, A.
Context. For the precise spectral analysis of hot stars, advanced stellar-atmosphere models that consider deviations from the local thermodynamic equilibrium are mandatory. This requires accurate atomic data to calculate all transition rates and occupation numbers for atomic levels in the considered model atoms, not only for a few prominent lines …
The double low-mass white dwarf eclipsing binary system J2102-4145 and its possible evolution
Dhillon, V. S.; Marsh, T. R.; Littlefair, S. P. +7 more
In recent years, about 150 low-mass white dwarfs (WDs), typically with masses below 0.4 M⊙, have been discovered. The majority of these low-mass WDs are observed in binary systems as they cannot be formed through single-star evolution within Hubble time. In this work, we present a comprehensive analysis of the double low-mass WD eclipsi…