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Setting the scene for BUFFALO: a study of the matter distribution in the HFF galaxy cluster MACS J0416.1-2403 and its parallel field
Diego, J. M.; Steinhardt, C. L.; Koekemoer, A. M. +11 more
In the context of the Beyond Ultradeep Frontier Fields And Legacy Observations (BUFFALO) survey, we present a new analysis of the merging galaxy cluster MACS J0416.1-2403 (z = 0.397) and its parallel field using Hubble Frontier Fields (HFF) data. We measure the surface mass density from a weak-lensing analysis and characterize the overall matter d…
Bipolar molecular outflow of the very low-mass star Par-Lup3-4. Evidence for scaled-down low-mass star formation
de Gregorio-Monsalvo, I.; Huélamo, N.; Testi, L. +7 more
Context. Very low-mass stars are known to have jets and outflows, which is indicative of a scaled-down version of low-mass star formation. However, only very few outflows in very low-mass sources are well characterized.
Aims: We characterize the bipolar molecular outflow of the very low-mass star Par-Lup3-4, a 0.12 M⊙ object known …
BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses⋆
Strassmeier, K. G.; Weber, M.; Granzer, T. +7 more
Context. Knowing rotational and pulsational periods across the Hertzsprung-Russell diagram is of top priority for understanding stellar activity as a function of time.
Aims: We aim to determine periods for bright stars in the Auriga field that are otherwise not easily accessible for ground-based photometry.
Methods: Continuous photometry…
Fluid Theory of Coherent Magnetic Vortices in High-β Space Plasmas
Alexandrova, Olga; Maksimović, Milan; Jovanović, Dušan +1 more
In situ observations in Earth's and Saturn's magnetosheaths and in the solar wind reveal the presence of Alfvén vortices as intermittent structures in the range of scales from fluid lengths down to a few ion lengths. The density and the magnetic field associated with them appear to be compressible for higher plasma betas. Until now, only incompres…
X-ray spectra and light curves of cooling novae and a nova like
Sun, Bangzheng; Orio, Marina; Shugarov, Sergey +3 more
We present X-ray observations of novae V2491 Cyg and KT Eri about 9 yr post-outburst of the dwarf nova and post-nova candidate EY Cyg, and of a VY Scl variable. The first three objects were observed with XMM-Newton, KT Eri also with the Chandra ACIS-S camera, V794 Aql with the Chandra ACIS-S camera and High Energy Transmission Gratings. The two re…
Statistics of solar wind electron breakpoint energies using machine learning techniques
Walsh, A. P.; Rae, I. J.; Smith, A. W. +4 more
Solar wind electron velocity distributions at 1 au consist of a thermal "core" population and two suprathermal populations: "halo" and "strahl". The core and halo are quasi-isotropic, whereas the strahl typically travels radially outwards along the parallel or anti-parallel direction with respect to the interplanetary magnetic field. Using Cluster…
Spectroscopic detection of coronal plasma flows in loops undergoing thermal non-equilibrium cycles
Auchère, Frédéric; Parenti, Susanna; Pelouze, Gabriel +3 more
Context. Long-period intensity pulsations were recently detected in the EUV emission of coronal loops and attributed to cycles of plasma evaporation and condensation driven by thermal non-equilibrium (TNE). Numerical simulations that reproduce this phenomenon also predict the formation of periodic flows of plasma at coronal temperatures along some…
Investigating the Rosetta/RTOF observations of comet 67P/Churyumov-Gerasimenko using a comet nucleus model: influence of dust mantle and trapped CO
Lasue, J.; Altwegg, K.; Garnier, P. +6 more
Context. Cometary outgassing is induced by the sublimation of ices and the ejection of dust originating from the nucleus. Therefore measuring the composition and dynamics of the cometary gas provides information concerning the interior composition of the body. Nevertheless, the bulk composition differs from the coma composition, and numerical mode…
η Carinae: high angular resolution continuum, H30α and He30α ALMA images
Cox, Pierre; Nyman, Lars-Åke; Abraham, Zulema +2 more
We present images of η Carinae in the recombination lines H30α and He30α and the underlying continuum with 50 mas resolution (110 au), obtained with ALMA. For the first time, the 230 GHz continuum image is resolved into a compact core, coincident with the binary system position, and a weaker extended structure to the NW of the compact source. Iso-…
Gas and dust cooling along the major axis of M 33 (HerM33es). Herschel/PACS [C II] and [O I] observations
Boquien, Médéric; van der Werf, Paul; Combes, Françoise +17 more
Context. M 33 is a gas rich spiral galaxy of the Local Group. Its vicinity allows us to study its interstellar medium (ISM) on linear scales corresponding to the sizes of individual giant molecular clouds.
Aims: We investigate the relationship between the two major gas cooling lines and the total infrared (TIR) dust continuum.
Methods: W…