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Optical Emission of the Ultraluminous X-Ray Source NGC 5408 X-1: Donor Star or Irradiated Accretion Disk?
Kaaret, P.; Tao, L.; Corbel, S. +3 more
We obtained three epochs of simultaneous Hubble Space Telescope (HST)/Wide Field Camera 3 and Chandra observations of the ultraluminous X-ray source (ULX) NGC 5408 X-1. The counterpart of the X-ray source is seen in all HST filters, from the UV through the near-IR (NIR), and for the first time, we resolve the optical nebula around the ULX. We iden…
Extensive surface pedogenic alteration of the Martian Noachian crust suggested by plateau phyllosilicates around Valles Marineris
Jaumann, R.; Quantin, Cathy; Le Deit, Laetitia +6 more
Thousands of phyllosilicate-rich outcrops, mainly iron or magnesium-rich are exposed on Noachian terrains in the Martian southern highlands. We analyzed 90 CRISM observations and more than a hundred HiRISE images located on the plateaus surrounding Valles Marineris. We mapped an extensive Al- and Fe/Mg-phyllosilicate-rich formation covering at lea…
Gas sloshing, cold fronts, Kelvin-Helmholtz instabilities and the merger history of the cluster of galaxies Abell 496
Ghizzardi, S.; Lovisari, L.; Brüggen, M. +4 more
We investigate the origin and nature of the multiple sloshing cold fronts in the core of Abell 496 by direct comparison between observations and dedicated hydrodynamical simulations. Our simulations model a minor merger with a 4 × 1013 M⊙ subcluster crossing A496 from the south-west to the north-north-east, passing the cluste…
Forward Cascade of Whistler Turbulence: Three-dimensional Particle-in-cell Simulations
Gary, S. Peter; Chang, Ouliang; Wang, Joseph
This manuscript describes the first ensemble of three-dimensional (3D) particle-in-cell (PIC) plasma simulations of whistler turbulence. The computational model represents a collisionless, homogeneous, magnetized plasma on which an initial spectrum of relatively long wavelength whistler fluctuations is imposed. The simulations represent a range of…
HR 5907: Discovery of the most rapidly rotating magnetic early B-type star by the MiMeS Collaboration
Rivinius, Th.; Wade, G. A.; Bohlender, D. A. +14 more
We report the discovery and analysis of a very strong magnetic field in the rapidly rotating early B-type star HR 5907, based on observations obtained as part of the Magnetism in Massive Stars (MiMeS) project. We infer a rotation period of 0.508 276+0.000 015-0.000 012 d from photometric and Hα EW measurements, making this th…
A Data-driven Model for the Global Coronal Evolution
Wu, S. T.; Feng, Xueshang; Jiang, Chaowei +2 more
This work is devoted to the construction of a data-driven model for the study of the dynamic evolution of the global corona that can respond continuously to the changing of the photospheric magnetic field. The data-driven model consists of a surface flux transport (SFT) model and a global three-dimensional (3D) magnetohydrodynamic (MHD) coronal mo…
Spacecraft VLBI and Doppler tracking: algorithms and implementation
Molera Calvés, G.; Gurvits, L. I.; Duev, D. A. +3 more
Aims: We present the results of several multi-station Very Long Baseline Interferometry (VLBI) experiments conducted with the ESA spacecraft Venus Express as a target. To determine the true capabilities of VLBI tracking for future planetary missions in the solar system, it is necessary to demonstrate the accuracy of the method for existing op…
Investigating Slim Disk Solutions for HLX-1 in ESO 243-49
Gehrels, N.; Braito, V.; Farrell, S. A. +7 more
The hyperluminous X-ray source HLX-1 in the galaxy ESO 243-49, currently the best intermediate-mass black hole (BH) candidate, displays spectral transitions similar to those observed in Galactic BH binaries, but with a luminosity 100-1000 times higher. We investigated the X-ray properties of this unique source by fitting multi-epoch data collected…
Analytic theory of Titan's Schumann resonance: Constraints on ionospheric conductivity and buried water ocean
Sotin, Christophe; Karkoschka, Erich; Berthelier, Jean-Jacques +6 more
This study presents an approximate model for the atypical Schumann resonance in Titan's atmosphere that accounts for the observations of electromagnetic waves and the measurements of atmospheric conductivity performed with the Huygens Atmospheric Structure and Permittivity, Wave and Altimetry (HASI-PWA) instrumentation during the descent of the Hu…
Observations of the nightside ionosphere of Mars by the Mars Express Radio Science Experiment (MaRS)
Hinson, D. P.; Witasse, O.; Withers, Paul +7 more
The vertical structure of the nightside ionosphere of Mars and its dependence on solar zenith angle are currently poorly determined, as is the importance of two key sources of nightside plasma, electron precipitation and transport of dayside plasma. We examined 37 electron density profiles of the ionosphere of Mars at solar zenith angles of 101°-1…