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Key structural characteristics of porous layers in diffusion modelling: A study on polydispersity, shape, and hierarchy
Skorov, Yuri; Reshetnyk, Volodymyr; Blum, Jürgen +5 more
In this study, we explored various open-source models for generating porous media. These models enabled us to examine different types of porous beds, including layers of polydisperse spheres with various size distributions, layers of porous aggregates – either fragments of parent porous layers or those formed during the agglomeration of polydisper…
Exploring the disc-jet scenario in 3C 273 using simultaneous XMM-Newton and NuSTAR observations
Wiita, Paul J.; Pandey, Ashwani; Mondal, Santanu
Context. The well-studied active galactic nucleus (AGN) 3C 273 displays characteristics of both jetted-AGNs and Seyfert galaxies, which makes it an excellent source to study the disc-jet connection in AGNs. Aims. We aim to investigate the disc-jet scenario in 3C 273 using broad-band (0.3–78 keV) X-ray spectra from XMM-Newton and NuSTAR. Methods. W…
Dynamic and radiative implications of jet–star interactions in AGN jets
Kovalev, Y. Y.; Fichet de Clairfontaine, G.; Perucho, M. +1 more
Context. The interactions between jets from active galactic nuclei (AGN) and their stellar environments significantly influence jet dynamics and emission characteristics. In low-power jets, such as those in Fanaroff-Riley I (FR I) galaxies, the jet–star interactions can notably affect jet deceleration and energy dissipation. Aims. Recent numerical…
Localization of the Cluster satellites in the geospace environment
Darrouzet, Fabien; De Keyser, Johan; Masson, Arnaud +10 more
The geometry of the terrestrial magnetized environment, or geospace, varies widely in space and time due to the Earth's magnetic field interactions with the interplanetary medium. A spacecraft's location in geospace is only approximately determined by its coordinates since the environment is inhomogeneous, with distinct physical processes occurrin…
An Exceptionally Powerful, Radiatively Driven Ultrafast Outflow in the Rapidly Accreting AGN RE J1034+396
Allen, Steven W.; Wilkins, Daniel R.; Taylor, Chloe S.
We report the analysis of ∼1 Ms of XMM-Newton observations of the rapidly accreting active galactic nucleus RE J1034+396. The 0.3–9 keV EPIC-pn spectra are well described by a model consisting of steep continuum emission from the corona accompanied by relativistically blurred reflection from a highly ionized accretion disk. The source is known to …
Prediction of Halo Coronal Mass Ejections Using SDO/HMI Vector Magnetic Data Products and a Transformer Model
Xu, Yan; Jing, Ju; Wang, Haimin +6 more
We present a transformer model, named DeepHalo, to predict the occurrence of halo coronal mass ejections (CMEs). Our model takes as input an active region (AR) and a profile, where the profile contains a time series of data samples in the AR that are collected 24 hr before the beginning of a day, and predicts whether the AR would produce a halo CM…
The variability of the topside ionospheres of Venus and Mars as seen by recent radio science observations
Fränz, Markus; Tellmann, Silvia; Pätzold, Martin +7 more
This study combines the observations of the Venus Express Venus Radio science experiment (VeRa), Mars Express Mars Radio Science experiment (MaRS), and MAVEN Radio Occultation Science Experiment (ROSE) at Venus and Mars with proxies for environmental parameters, insolation and solar wind characteristics to compare the effects of individual drivers…
HCG 57: Evidence for Shock-heated Intergalactic Gas from X-Rays and Optical Emission Line Spectroscopy
Zezas, Andreas; Appleton, P. N.; Vrtilek, Jan M. +5 more
We present Chandra and XMM-Newton X-ray observations of the compact group HCG 57, and optical integral field spectroscopy of the interacting galaxy pair HCG 57A/D. These two spiral galaxies recently suffered an off-axis collision with HCG 57D passing through the disk of A. We find evidence of a gas bridge linking the galaxies, containing ∼108…
Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region
Gromadzki, M.; Cseh, B.; Kriskovics, L. +28 more
Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been undergoing since 2018. Methods. We used public-domain archival photometry to characterise the quiescent phase and to establish the ma…
Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A
Liu, B.; Liu, Y.; Zhang, Yong +311 more
The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of