Search Publications
The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies—3D Dynamics and Radially Resolved Stellar Initial Mass Functions
Bender, Ralf; Thomas, Jens; Hill, Gary J. +9 more
We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity dispersions (∼25 km s‑1) and higher-order kinematic moments out to the half-light radius. We find …
First detection of CF+ in the Large Magellanic Cloud
Gong, Yan; Menten, Karl M.; Jacob, Arshia M. +2 more
Context. CF+ has been established as a valuable diagnostic tool for investigating photodissociation regions (PDRs) and fluorine abundances in the Milky Way. However, its role in extragalactic environments remains largely uncharted.
Aims: Our objective is to explore the significance of CF+ in the Large Magellanic Cloud (L…
Local Proton Heating at Magnetic Discontinuities in Alfvénic and Non-Alfvénic Solar Wind
Bandyopadhyay, R.; Tenerani, A.; Verniero, J. L. +1 more
We investigate the local proton energization at magnetic discontinuities/intermittent structures and the corresponding kinetic signatures in velocity phase space in Alfvénic (high cross helicity) and non-Alfvénic (low cross helicity) wind streams observed by Parker Solar Probe. By means of the partial variance of increments method, we find that th…
Walking the Line: Young Stars on the Boundary of the Epsilon Cha and Lower Centaurus Crux Associations
Kastner, Joel H.; Dickson-Vandervelde, D. Annie; Varga, Attila +1 more
Gaia Data Release 3 (DR3) has provided the largest and most astrometrically precise catalog of nearby stars to date, allowing for a more complete membership census of nearby, young stellar moving groups. These loose associations of young (age <100 Myr) stars within ∼100 pc are vital laboratories for the study of the early evolution of low-mass …
The search for DA double white dwarf binary candidates from SDSS DR14
Zhao, Gang; Li, Zhenwei; Zhao, Jingkun +4 more
Aims: Double white dwarf (DWD) binaries are one of the channels through which type Ia supernovae explosions occur. With the release of more and more sky survey data, the search for additional DWDs has become a possibility. We utilized the spectroscopic data from SDSS DR14 to search for DWD binaries based on variations in radial velocities (RV…
Flare heating of the chromosphere: Observations of flare continuum from GREGOR and IRIS
Berlicki, A.; Liu, W.; Dudík, J. +8 more
Context. On 2022 May 4, an M5.7 flare erupted in the active region NOAA 13004, which was the target of a coordinated campaign between GREGOR, IRIS, Hinode, and ground-based instruments at the Ondřejov observatory. A flare kernel located at the edge of a pore was co-observed by the IRIS slit and GREGOR HiFI+ imagers. Aims. We investigated the flare…
NIKA2 observations of dust grain evolution from star-forming filament to T-Tauri disk: Preliminary results from NIKA2 observations of the Taurus B211/B213 filament
Berta, S.; Aussel, H.; Adam, R. +51 more
To understand the evolution of dust properties in molecular clouds in the course of the star formation process, we constrain the changes in the dust emissivity index from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using the NIKA2 continuum camera on the IRAM 30 m telescope. we observed the Taurus B211/B2I3 filame…
Kinematic study of the Orion Complex: analysing the young stellar clusters from big and small structures
Sánchez-Sanjuán, Sergio; Hernández, Jesús; Pérez-Villegas, Ángeles +4 more
In this work, we analysed young stellar clusters with spatial and kinematic coherence in the Orion star-forming complex. For this study, we selected a sample of pre-main-sequence candidates using parallaxes, proper motions, and positions on the colour-magnitude diagram. After applying a hierarchical clustering algorithm in the 5D parameter space p…
Multi-spacecraft study with the Icarus model: Modelling the propagation of CMEs to Mercury and Earth
Schmieder, B.; Poedts, S.; Démoulin, P. +2 more
Context. Coronal mass ejections (CMEs) are the main drivers of the disturbances in interplanetary space. Earth-directed CMEs can be dangerous, and understanding the CME interior magnetic structure is crucial for advancing space weather studies. It is important to assess the capabilities of a numerical heliospheric model, as a firm understanding of…
Strong Effects of Chorus Waves on Radiation Belts Expected for Future Magnetic Superstorms
Hanzelka, Miroslav; Santolík, Ondřej; Wang, Dedong +4 more
Processes in the radiation belts under extreme geomagnetic conditions involve the interplay between acceleration and loss processes, both of which can be caused by wave-particle interactions. Whistler mode waves play a critical role in these interactions, and up to now their properties during extreme events remained poorly sampled and understood. …