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UV-optical Emission of AB Aur b Is Consistent with Scattered Stellar Light
Herczeg, Gregory J.; Zhou, Yifan; Kraus, Adam L. +12 more
The proposed protoplanet AB Aur b is a spatially concentrated emission source imaged in the millimeter-wavelength disk gap of the Herbig Ae/Be star AB Aur. Its near-infrared spectrum and absence of strong polarized light have been interpreted as evidence supporting the protoplanet interpretation. However, the complex scattered-light structures in …
An 600 pc View of the Strongly Lensed, Massive Main-sequence Galaxy J0901: A Baryon-dominated, Thick Turbulent Rotating Disk with a Clumpy Cold Gas Ring at z = 2.259
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +19 more
We present a high-resolution kinematic study of the massive main-sequence star-forming galaxy (SFG) SDSS J090122.37+181432.3 (J0901) at z = 2.259, using ~0.″36 Atacama Large Millimeter/submillimeter Array CO(3-2) and ~0.″1-0.″5 SINFONI/VLT Hα observations. J0901 is a rare, strongly lensed but otherwise normal massive ( $\mathrm{log}({M}_{\star }/{…
PENELLOPE. IV. A comparison between optical forbidden lines and H2 UV lines in the Orion OB1b and σ-Ori associations
France, K.; Kóspál, Á.; Siwak, M. +17 more
Context. Observing the spatial distribution and excitation processes of atomic and molecular gas in the inner regions (<20 au) of young (<10 Myr) protoplanetary disks helps us to understand the conditions for the formation and evolution of planetary systems.
Aims: In the framework of the PENELLOPE and ULLYSES projects, we aim to charact…
The dark side of FIRE: predicting the population of dark matter subhaloes around Milky Way-mass galaxies
Sanderson, Robyn; Wetzel, Andrew; Samuel, Jenna +3 more
A variety of observational campaigns seek to test dark matter models by measuring dark matter subhaloes at low masses. Despite their predicted lack of stars, these subhaloes may be detectable through gravitational lensing or via their gravitational perturbations on stellar streams. To set measurable expectations for subhalo populations within Lamb…
Chronology of the chemical enrichment of the old Galactic stellar populations
Smiljanic, R.; Giribaldi, R. E.
Context. Over its history, the Milky Way has accreted several smaller satellite galaxies. These mergers added stars and gas to the Galaxy and affected the properties of the pre-existing stellar populations. Stellar chemical abundances and ages are needed to establish the chronological order of events that occur before, during, and after such merge…
Albatross: a scalable simulation-based inference pipeline for analysing stellar streams in the Milky Way
Weniger, Christoph; Alvey, James; Gerdes, Mathis
Stellar streams are potentially a very sensitive observational probe of galactic astrophysics, as well as the dark matter population in the Milky Way. On the other hand, performing a detailed, high-fidelity statistical analysis of these objects is challenging for a number of key reasons. First, the modelling of streams across their (potentially bi…
Eruption and propagation of twisted flux ropes from the base of the solar corona to 1 au
Auchère, F.; Janvier, M.; Lugaz, N. +3 more
Context. Interplanetary coronal mass ejections (ICMEs) originate from the eruption of complex magnetic structures occurring in our star's atmosphere. Determining the general properties of ICMEs and the physical processes at the heart of their interactions with the solar wind is a hard task, in particular using only unidimensional in situ profiles.…
AutoTAB: Automatic Tracking Algorithm for Bipolar Magnetic Regions
Banerjee, Dipankar; Sreedevi, Anu; Jha, Bibhuti Kumar +1 more
Bipolar magnetic regions (BMRs) provide crucial information about solar magnetism. They exhibit varying morphology and magnetic properties throughout their lifetime, and studying these properties can provide valuable insights into the workings of the solar dynamo. The majority of previous studies have counted every detected BMR as a new one and ha…
eRASSt J074426.3 + 291606: prompt accretion disc formation in a 'faint and slow' tidal disruption event
Salvato, M.; Liu, Z.; Buchner, J. +10 more
We report on multiwavelength observations of the tidal disruption event (TDE) candidate eRASSt J074426.3 + 291606 (J0744), located in the nucleus of a previously quiescent galaxy at z = 0.0396. J0744 was first detected as a new, ultra-soft X-ray source (photon index ~4) during the second SRG/eROSITA All-Sky Survey (eRASS2), where it had brightened…
Constraining the X-ray reflection in low accretion-rate active galactic nuclei using XMM-Newton, NuSTAR, and Swift
Malizia, A.; Arévalo, P.; Diaz, Y. +8 more
Context. An interesting feature of active galactic nuclei (AGN) accreting at low rates is the weakness of the reflection features in their X-ray spectra, which may result from the gradual disappearance of the torus with decreasing accretion rates. It has been suggested that low-luminosity AGN (LLAGN) would exhibit a different reflector configurati…