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Fragmentation in the massive G31.41+0.31 protocluster
Maud, L. T.; Csengeri, T.; Beuther, H. +18 more
Context. ALMA observations at 1.4 mm and ~0."2 (~750 au) angular resolution of the Main core in the high-mass star-forming region G31.41+0.31 have revealed a puzzling scenario. On the one hand, the continuum emission looks very homogeneous and the core appears to undergo solid-body rotation, suggesting a monolithic core stabilized by the magnetic …
ORion Alma New GEneration Survey (ORANGES). I. Dust continuum and free-free emission of OMC-2/3 filament protostars
Ceccarelli, C.; Yang, Y. -L.; López-Sepulcre, A. +3 more
Context. The spectral energy distribution (SED) in the millimetre to centimetre range is an extremely useful tool for characterising the dust in protostellar envelopes as well as free-free emission from the protostar and outflow. Actually, the evolutionary status of solar-type protostars is often based on their SED in the near-infrared to millimet…
Cross-comparison of global simulation models applied to Mercury's dayside magnetosphere
André, N.; Budnik, E.; Génot, V. +14 more
We present the first comparison of multiple global simulations of the solar wind interaction with Mercury's dayside magnetosphere, conducted in the framework of the international collaborative project SHOTS - Studies on Hermean magnetosphere Oriented Theories and Simulations. Two 3D magnetohydrodynamic and two 3D hybrid simulation codes are used t…
Probing Intra-Halo Light with Galaxy Stacking in CIBER Images
Cooray, Asantha; Matsuura, Shuji; Zemcov, Michael +13 more
We study the stellar halos of 0.2 ≲ z ≲ 0.5 galaxies with stellar masses spanning M* ~ 1010.5 to 1012M⊙ (approximately L* galaxies at this redshift) using imaging data from the Cosmic Infrared Background Experiment (CIBER). A previous CIBER fluctuation analysis suggested that intra-halo light …
The nature of hyperluminous infrared galaxies
Małek, K.; Wang, L.; Farrah, D. +7 more
Context. Hyperluminous infrared galaxies (HLIRGs) are shown to have been more abundant in early epochs. The small samples used in earlier studies are not sufficient to draw robust statistical conclusions regarding the physical properties and the power sources of these extreme infrared (IR) bright galaxies.
Aims: We make use of multi-wavelengt…
The Cusp–Core Problem in Gas-Poor Dwarf Spheroidal Galaxies
Boldrini, Pierre
This review deals with the inconsistency of inner dark matter density profiles in dwarf galaxies, known as the cusp–core problem. In particular, we aim to focus on gas-poor dwarf galaxies. One of the most promising solutions to this cold dark matter small-scale issue is the stellar feedback, but it seems to be only designed for gas-rich dwarfs. Ho…
Abell 1430: A merging cluster with exceptional diffuse radio emission
Brunetti, G.; Rossetti, M.; Shimwell, T. W. +16 more
Context. Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as relic or halo emission, which are believed to be related to merger shocks or volume-filling turbulence, respectively. Recent observations have revealed radio bri…
ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae. I. Morpho-kinematical interpretation of CO and SiO emission
Kervella, Pierre; Decin, Leen; Montargès, Miguel +36 more
Evolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially correlated structures in the nebula are thought to originate from the interaction of the stellar wind with a com…
Hierarchically modelling Kepler dwarfs and subgiants to improve inference of stellar properties with asteroseismology
Chaplin, William J.; Davies, Guy R.; Huber, Daniel +9 more
With recent advances in modelling stars using high-precision asteroseismology, the systematic effects associated with our assumptions of stellar helium abundance (Y) and the mixing-length theory parameter (αMLT) are becoming more important. We apply a new method to improve the inference of stellar parameters for a sample of Kepler dwarf…
Dust observations from Parker Solar Probe: dust ejection from the inner Solar System
Czechowski, A.; Mann, I.
Context. The FIELDS instrument onboard Parker Solar Probe (PSP) observes dust impacts on the spacecraft. The derived dust flux rates suggest that the particles originate from the vicinities of the Sun and are ejected by radiation pressure. Radiation pressure typically ejects particles of several 100 nm and smaller, which are also affected by the e…