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RT Crucis: a look into the X-ray emission of a peculiar symbiotic star
Santangelo, A.; Ducci, L.; Ferrigno, C. +3 more
Symbiotic stars are a heterogeneous class of interacting binaries. Among them, RT Cru has been classified as prototype of a subclass that is characterised by hard X-ray spectra that extend past ~20 keV. We analyse ~8.6 Ms of archival INTEGRAL data collected during the period 2003-2014, ~ 140 ks of Swift/XRT data, and a Suzaku observation of 39 ks,…
Reconnection layer bounded by switch-off shocks: Dayside magnetopause crossing by THEMIS D
Phan, Tai; Eriksson, Stefan; Haaland, Stein +2 more
We discuss observations of reconnection, obtained by Time History of Events and Macroscale Interactions during Substorms (THEMIS) D during an outward bound traversal of the low-latitude dayside magnetopause. The reconnection signatures include high magnetic shear, a southward directed Alfvénic jet, bounded by slow-mode shocks near the switch-off l…
Dynamical Estimate of Post-main-sequence Stellar Masses in 47 Tucanae
Heyl, Jeremy; Richer, Harvey; Kalirai, Jason +2 more
We use the effects of mass segregation on the radial distribution of different stellar populations in the core of 47 Tucanae to find estimates for the masses of stars at different post-main-sequence evolutionary stages. We take samples of main-sequence (MS) stars from the core of 47 Tucanae, at different magnitudes (I.e., different masses), and us…
Analysis of the dust jet imaged by Rosetta VIRTIS-M in the coma of comet 67P/Churyumov-Gerasimenko on 2015 April 12
Bieler, A.; Capaccioni, F.; Combi, M. R. +10 more
This work is a part of a more global effort aimed at understanding and interpreting in situ and remote sensing data acquired by instruments on board Rosetta. This study aims at deriving the dust mass source rate and the location of the dust jet source observed by Rosetta VIRTIS-M on 2015 April 12. The analysis is performed by means of the coupled …
Can we distinguish early dark energy from a cosmological constant?
Shi, Difu; Baugh, Carlton M.
Early dark energy (EDE) models are a class of quintessence dark energy with a dynamically evolving scalar field which display a small but non-negligible amount of dark energy at the epoch of matter-radiation equality. Compared with a cosmological constant, the presence of dark energy at early times changes the cosmic expansion history and conseque…
A submillimetre search for pre- and proto-brown dwarfs in Chamaeleon II
de Gregorio-Monsalvo, I.; Eiroa, C.; Bayo, A. +7 more
Context. The Chamaeleon II molecular cloud is an active star-forming region that offers an excellent opportunity to study the formation of brown dwarfs in the southern hemisphere.
Aims: Our aims are to identify a population of pre- and proto-brown dwarfs (5σ mass limit threshold of ~0.015 M⊙) and provide information on the formatio…
Diagnosing shock temperature with NH3 and H2O profiles
Codella, C.; Bachiller, R.; Fuente, A. +9 more
In a previous study of the L1157 B1 shocked cavity, a comparison between NH3(10-00) and H2O(110-101) transitions showed a striking difference in the profiles, with H2O emitting at definitely higher velocities. This behaviour was explained as a result of the high-temperatu…
Spatial Distribution and Kinematics of the Molecular Material Associated with eta Carinae
Menten, Karl M.; Zapata, Luis A.; Rodríguez, Luis F. +3 more
Single-dish submillimeter observations have recently revealed the existence of a substantial, chemically peculiar molecular gas component located in the innermost circumstellar environment of the very massive luminous blue variable star, η Carinae. Here, we present 5″-resolution interferometric observations of the 1\to 0 rotational transition of h…
Study of electric and magnetic field fluctuations from lower hybrid drift instability waves in the terrestrial magnetotail with the fully kinetic, semi-implicit, adaptive multi level multi domain method
Lapenta, G.; Norgren, C.; Markidis, S. +3 more
The newly developed fully kinetic, semi-implicit, adaptive multi-level multi-domain (MLMD) method is used to simulate, at realistic mass ratio, the development of the lower hybrid drift instability (LHDI) in the terrestrial magnetotail over a large wavenumber range and at a low computational cost. The power spectra of the perpendicular electric fi…
Photometry of dust grains of comet 67P and connection with nucleus regions
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Aims: Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks.
Methods: We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photom…