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New constraints on Ganymede's hydrogen corona: Analysis of Lyman-α emissions observed by HST/STIS between 1998 and 2014
Alday, Juan; Saur, Joachim; Roth, Lorenz +4 more
Far-ultraviolet observations of Ganymede's atmospheric emissions were obtained with the Space Telescope Imaging Spectrograph (STIS) onboard of the Hubble Space Telescope (HST) on several occasions between 1998 and 2014. We analyze the Lyman-α emission from four HST campaigns in order to constrain the abundance and variation of atomic hydrogen in G…
Variegate galaxy cluster gas content: Mean fraction, scatter, selection effects, and covariance with X-ray luminosity
Andreon, S.; Moretti, A.; Wang, J. +2 more
We use a cluster sample selected independently of the intracluster medium content with reliable masses to measure the mean gas mass fraction and its scatter, the biases of the X-ray selection on gas mass fraction, and the covariance between the X-ray luminosity and gas mass. The sample is formed by 34 galaxy clusters in the nearby (0.050 < z &l…
Kinematics of the galaxy from Cepheids with proper motions from the Gaia DR1 catalogue
Bobylev, V. V.
A sample of classical Cepheids with known distances and line-of-sight velocities has been supplemented with proper motions from the Gaia DR1 catalogue. Based on the velocities of 260 stars, we have found the components of the peculiar solar velocity vector ( U, V, W)⊙ = (7.90, 11.73, 7.39) ± (0.65, 0.77, 0.62) km s-1 and the …
Swift, XMM-Newton, and NuSTAR Observations of PSR J2032+4127/MT91 213
Takata, J.; Kong, A. K. H.; Hui, C. Y. +3 more
We report our recent Swift, NuSTAR, and XMM-Newton X-ray and Lijiang optical observations on PSR J2032+4127/MT91 213, the γ-ray binary candidate with a period of 45-50 years. The coming periastron of the system was predicted to be in 2017 November, around which high-energy flares from keV to TeV are expected. Recent studies with Chandra and Swift …
Fully stripped? The dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4-3342
Richard, J.; Ebeling, H.; Qi, J.
We present the results of a multiwavelength investigation of the very X-ray luminous galaxy cluster MACSJ0553.4-3342 (z = 0.4270; hereafter MACSJ0553). Combining high-resolution data obtained with the Hubble Space Telescope and the Chandra X-ray Observatory with ground-based galaxy spectroscopy, our analysis establishes the system unambiguously as…
The evolution of Saturn's radiation belts modulated by changes in radial diffusion
Krupp, N.; Roussos, E.; Paranicas, C. +2 more
Globally magnetized planets, such as the Earth1 and Saturn2, are surrounded by radiation belts of protons and electrons with kinetic energies well into the million electronvolt range. The Earth's proton belt is supplied locally from galactic cosmic rays interacting with the atmosphere3, as well as from slow inward …
Tail reconnection in the global magnetospheric context: Vlasiator first results
Pulkkinen, Tuija I.; Vainio, Rami; Juusola, Liisa +7 more
The key dynamics of the magnetotail have been researched for decades and have been associated with either three-dimensional (3-D) plasma instabilities and/or magnetic reconnection. We apply a global hybrid-Vlasov code, Vlasiator, to simulate reconnection self-consistently in the ion kinetic scales in the noon-midnight meridional plane, including b…
The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper Motion Verified Low-mass Stars and Brown Dwarfs from SDSS, 2MASS, and WISE
Burgasser, Adam J.; Schmidt, Sarah J.; Theissen, Christopher A. +2 more
We present the Late-Type Extension to the Motion Verified Red Stars (LaTE-MoVeRS) catalog, containing 46,463 photometric late-type (>M5) dwarfs within the Sloan Digital Sky Survey (SDSS) footprint. Proper motions were computed for objects combining astrometry from the SDSS Data Release 12 (DR12), the Two-micron All-Sky Survey (2MASS) Point Sour…
Multiwavelength variability study and search for periodicity of PKS 1510-089
Tagliaferri, G.; Ghisellini, G.; Pian, E. +14 more
Context. Blazars are the most luminous and variable active galactic nuclei (AGNs). They are thus excellent probes of accretion and emission processes close to the central engine.
Aims: We concentrate here on PKS 1510-089 (z = 0.36), a blazar belonging to the flat-spectrum radio quasar subclass, an extremely powerful gamma-ray source and one o…
Morphology and the Color-mass Diagram as Clues to Galaxy Evolution at z&approx1
Schawinski, Kevin; Urry, C. Megan; Simmons, Brooke D. +4 more
We study the significance of mergers in the quenching of star formation in galaxies at z∼ 1 by examining their color-mass distributions for different morphology types. We perform two-dimensional light profile fits to GOODS iz images of ∼5000 galaxies and X-ray selected active galactic nucleus (AGN) hosts in the CANDELS/GOODS-north and south fields…