Search Publications
Multipoint study of the rapid filament evolution during a confined C2 flare on 28 March 2022, leading to eruption
Krucker, Säm; Veronig, Astrid M.; Dissauer, Karin +5 more
Aims. This study focuses on the rapid evolution of the solar filament in active region 12975 during a confined C2 flare on 28 March 2022, which finally led to an eruptive M4 flare 1.5 h later. The event is characterized by the apparent breakup of the filament, the disappearance of its southern half, and the flow of the remaining filament plasma in…
Typing supernova remnant G352.7-0.1 using XMM-Newton X-ray observations
Vink, Jacco; Zhou, Ping; Mao, Junjie +4 more
G352.7-0.1 is a mixed-morphology (MM) supernova remnant (SNR) with multiple radio arcs and has a disputed supernova origin. We conducted a spatially resolved spectroscopic study of the remnant with XMM-Newton X-ray data to investigate its explosion mechanism and explain its morphology. The global X-ray spectra of the SNR can be adequately reproduc…
Ensemble X-ray variability of optically selected QSOs: dependence on black hole mass and Eddington ratio
Georgakakis, A.; Salvato, M.; Buchner, J. +7 more
Although flux variability is one of the defining properties of accretion flows on to supermassive black holes, its dependence on physical parameters such as the mass of the compact object and the Eddington ratio remains under discussion. In this paper, we address this issue using the structure function statistic to measure the variability at X-ray…
Do Solar Energetic Particle (SEP) Events Influence the Formation of the V0 Layer in the Venusian Ionosphere?
Choudhary, R. K.; Imamura, T.; Sánchez-Cano, Beatriz +2 more
This study investigates the potential impact of Solar Energetic Particles (SEPs) on the V0 layer of the Venus ionosphere. Electron density profiles obtained from radio occultation experiments conducted by the Venus Express (VEX) and Akatsuki missions were utilized for this purpose. Background data from the Analyzer of Space Plasma and E…
The Dark Energy Camera Magellanic Clouds Emission-line Survey
White, Richard L.; Rest, Armin; Blair, William P. +7 more
We have used the Dark Energy Camera (DECam) on the CTIO Blanco 4 m telescope to perform a new emission-line survey of the Large Magellanic Cloud (LMC) using narrowband Hα and [S II] filters in addition to a continuum band to create pure emission-line images. We refer to this new survey as DeMCELS, to distinguish it from the earlier Magellanic Clou…
How Common can the Origin of Clusters Cha I, Cha II, ϵ Cha and η Cha be?
Bobylev, V. V.; Bajkova, A. T.
The trajectories of the groupings η Cha, ϵ Cha and Cha I, Cha II, constructed backward in time, have been studied. We concluded that the hypothesis about the joint formation of all four of these clusters from one molecular cloud cannot be completely excluded. However, 10–15 Myr ago, all these four clusters were located at approximately the same he…
Double white dwarf binary population in MOCCA star clusters: Comparisons with observations of close and wide binaries
Giersz, M.; Belloni, D.; Hypki, A. +3 more
There could be a significant population of double white dwarf binaries (DWDs) inside globular clusters (GCs); however, these binaries are often too faint to be individually observed. We have utilized a large number GC models evolved with the Monte Carlo Cluster Simulator (MOCCA) code to create a large statistical dataset of DWDs. These models incl…
Quantifying interstellar extinction at high Galactic latitudes
Gilmore, Gerry; Mandel, Kaisey S.; O'Callaghan, Matthew
A detailed map of the distribution of dust at high Galactic latitudes is essential for future cosmic microwave background polarization experiments because the dust, while diffuse, remains a significant foreground in these regions. We develop a Bayesian model to identify a region of the Hertzsprung-Russell (HR) diagram suited to constrain the singl…
Gas-phase Molecules in Protoplanetary Nebulae with the 21 µm Emission Feature
Zhang, Yong; Li, Fei; Zhang, Jiang-Shui +6 more
It has been more than 30 years since the enigmatic 21 µm emission feature was first discovered in protoplanetary nebulae (PPNs). Although dozens of different dust carrier candidates have been proposed, there is as yet no widely accepted one. We present the results of molecular observations toward 21 µm objects using the 10 m Submillime…
Chemically peculiar stars on the pre-main sequence
Paunzen, E.; Prišegen, M.; Faltová, N. +12 more
Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects i…