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Episodic mass loss in the very luminous red supergiant [W60] B90 in the Large Magellanic Cloud
Udalski, A.; Boumis, P.; Boutsia, K. +6 more
Context. Despite mounting evidence that extreme red supergiants (RSGs) undergo episodic mass-loss events, their role in RSG evolution remains uncertain. Critical questions remain unanswered, such as whether or not these events can strip the star, and their timescale and frequency. Aims. This study delves into [W60] B90, one of the most luminous an…
PDRs4All. IX. Sulfur elemental abundance in the Orion Bar
Onaka, Takashi; Madden, Suzanne C.; Fuente, Asunción +31 more
Context. One of the main problems in astrochemistry is determining the amount of sulfur in volatiles and refractories in the interstellar medium. The detection of the main sulfur reservoirs (icy H2S and atomic gas) has been challenging, and estimates are based on the reliability of models to account for the abundances of species contain…
Equilibrium dynamical models in the inner region of the Large Magellanic Cloud based on Gaia DR3 kinematics
Kacharov, Nikolay; van de Ven, Glenn; Khoperskov, Sergey +3 more
Context. The Large Magellanic Cloud (LMC) contains complex dynamics driven by both internal and external processes. The external forces are due to tidal interactions with the Small Magellanic Cloud and the Milky Way, while internally its dynamics mainly depend on the stellar, gas, and dark matter mass distributions. Despite this complexity, simple…
Satellite group infall into the Milky Way: Exploring the Crater-Leo case with new HST proper motions
van der Marel, Roeland P.; Pawlowski, Marcel S.; Júlio, Mariana P. +3 more
Context. Within Λ cold dark matter (ΛCDM) simulations, Milky Way-like galaxies accrete some of their satellite galaxies in groups of 3–5 members rather than individually, and this has been suggested as a possible mechanism driving the formation of satellite planes. Objects accreted in groups are expected to share similar specific total energy and …
The JWST/NIRISS Deep Spectroscopic Survey for Young Brown Dwarfs and Free-floating Planets
Johnstone, Doug; Albert, Loïc; Doyon, René +9 more
The discovery and characterization of free-floating planetary-mass objects (FFPMOs) is fundamental to our understanding of star and planet formation. Here we report results from an extremely deep spectroscopic survey of the young star cluster NGC1333 using Near-InfraRed Imager and Slitless Spectrograph (NIRISS) wide field slitless spectroscopy on …
Inferring Fundamental Properties of the Flare Current Sheet Using Flare Ribbons: Oscillations in the Reconnection Flux Rates
Kazachenko, Maria D.; Lynch, Benjamin J.; Corchado Albelo, Marcel F.
Magnetic reconnection is understood to be the main physical process that facilitates the transformation of magnetic energy into heat, motion, and particle acceleration during solar eruptions. Yet, observational constraints on reconnection region properties and dynamics are limited due to a lack of high-cadence and high-spatial-resolution observati…
El Gordo needs El Anzuelo: Probing the structure of cluster members with multi-band extended arcs in JWST data
Caminha, G. B.; Suyu, S. H.; Galan, A. +2 more
Gravitational lensing by galaxy clusters involves hundreds of galaxies over a large redshift range and increases the likelihood of rare phenomena (supernovae, microlensing, dark substructures, etc.). Characterizing the mass and light distributions of foreground and background objects often requires a combination of high-resolution data and advance…
SRG/ART-XC all-sky X-ray survey: Catalog of sources detected during the first five surveys
Sunyaev, R.; Krivonos, R.; Sazonov, S. +27 more
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on the data of the first four and the partially completed fifth scans of the sky (ARTSS1-5). The catalog comprises 1545 sources detected in the 4-12 keV energy band.…
Improved constraints on Galactic Centre ejection of hypervelocity stars based on novel search method
Tohill, Clár-Bríd; Kuijken, Konrad; Koposov, Sergey E. +6 more
Hypervelocity stars (HVSs) are stars which have been ejected from the Galactic Centre (GC) at velocities of up to a few thousand
Identification of new nearby white dwarfs using Gaia DR3
Reffert, Sabine; Golovin, Alex; Vani, Akash +3 more
Context. A volume-complete sample of white dwarfs is essential for statistical studies of the white dwarf population. The sample of nearby white dwarfs is the only one that allows the faint end of the luminosity function to be probed and thus is the only one that covers the entire range of white dwarf ages. However, due to their intrinsic faintnes…