Search Publications
Disc wind or disc line? The extraordinary Fe-K feature of Mrk 1513
Bianchi, S.; Braito, V.; Nardini, E. +4 more
We discuss the origin of a very unusual spectral structure observed in the Fe-K band of the Seyfert galaxy Mrk 1513, a local (z = 0.063) active galactic nucleus (AGN) that is efficiently accreting matter onto its central supermassive black hole (Lbol/LEdd ∼ 0.5). We consider the highest quality X-ray observation of this sourc…
The Lockman-SpReSO project. Description, target selection, observations, and catalogue preparation
Krongold, Yair; Gallego, Jesús; Sánchez-Portal, Miguel +26 more
Context. Extragalactic surveys are a key tool for better understanding the evolution of galaxies. Both deep and wide-field surveys serve to provide a clearer emerging picture of the physical processes that take place in and around galaxies, and to identify which of these processes are the most important in shaping the properties of galaxies.
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Gaia colour-magnitude diagrams of young open clusters. Identification in the UBC catalogue and comparison between manual and automated analyses
de Burgos, A.; Negueruela, I.
Context. Automated analyses of Gaia astrometric data have led to the discovery of many new high-quality open cluster candidates. When a good determination of their parameters is available, these objects become excellent tools for investigating the properties of our Galaxy.
Aims: We explore whether young open clusters can be readily identified…
NIRwave: A wave-turbulence-driven solar wind model constrained by PSP observations
Güdel, M.; Boro Saikia, S.; Bartel, M. +2 more
Aims: We generate a model description of the solar wind based on an explicit wave-turbulence-driven heating mechanism, and constrain our model with observational data.
Methods: We included an explicit coronal heating source term in the general 3D magnetohydrodynamic code NIRVANA to simulate the properties of the solar wind. The adapted h…
Five-minute oscillations of photospheric and chromospheric swirls
Liu, Jiajia; Mathioudakis, Mihalis; Erdélyi, Robert +1 more
Context. Swirls are ubiquitous in the solar atmosphere. They are thought to be related to the excitation of different modes of magnetohydrodynamic waves and pulses, as well as spicules. However, statistical studies of their collective behaviour are rare.
Aims: We aim to study the collective as well as the individual behaviour of photospheric …
Anisotropies of solar energetic electrons in the MeV range measured with Solar Orbiter/EPD/HET
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Dresing, N. +4 more
Aims: This study analyses relativistic electron measurements obtained by the High Energy Telescope (HET) aboard Solar Orbiter in the energy range from 200 keV to above 10 MeV. Caveats of these measurements are discussed. The purpose of this study is to analyse anisotropies of relativistic solar energetic electrons utilising the different view…
Optical/X-ray/radio view of Abell 1213: A galaxy cluster with anomalous diffuse radio emission
De Grandi, S.; Riva, G.; Boschin, W. +5 more
Context. Abell 1213, a low-richness galaxy system, is known to host an anomalous radio halo detected in data of the Very Large Array (VLA). It is an outlier with regard to the relation between the radio halo power and the X-ray luminosity of the parent clusters.
Aims: Our aim is to analyze the cluster in the optical, X-ray, and radio bands to…
V4142 Sgr: Double periodic variable with an accretor surrounded by the accretion disk's atmosphere
Mennickent, R. E.; Djurašević, G.; Petrović, J. +4 more
Context. A detailed study of the close interacting binary V4142 Sgr, based on photometric and spectroscopic analyses, indicates that this system belongs to the enigmatic class of Algol-like variables exhibiting a long photometric cycle of an unknown nature.
Aims: By performing photometric data-mining and spectroscopic observations covering th…
Young nearby open clusters and their luminosity functions
Béjar, V. J. S.; Martín, E. L.; Lodieu, N. +3 more
Context. Open clusters are groups of coeval stars sharing properties such as distance and metallicity, and they are key to understanding stellar evolution.
Aims: Our main goal is to study the evolution of open clusters with a special focus on the universality of the luminosity function.
Methods: We applied an upgraded version of the conv…
Particle-in-cell modelling of comet 67P/Churyumov-Gerasimenko. Spatial structures of densities and electric fields
Goetz, Charlotte; Gunell, Herbert
Context. Sufficiently far from the Sun, all comets go through a phase of low activity. Rosetta observations at large heliocentric distances of approximately 3 au showed that the plasma at a low-activity comet is affected by both steady state electric fields and low-frequency waves.
Aims: Our goal is to provide a model for the electric fields …