Search Publications
The puzzling orbital period evolution of the LMXB AX J1745.6-2901
Stella, L.; Nandra, K.; Ponti, G. +2 more
The orbital period evolution of X-ray binaries provides fundamental clues to understanding mechanisms of angular momentum transfer and loss in these systems. We present an X-ray eclipse timing analysis of the transient low-mass X-ray binary AX J1745.6-2901. This system shows full eclipses and thus is one of the few objects of this class for which …
Coogoon Valles, western Arabia Terra: Hydrological evolution of a complex Martian channel system
de Pablo, Miguel Ángel; Molina, Antonio; López, Iván +3 more
Coogoon Valles is an intricate fluvial system, and its main channel was formed during the Noachian period through the erosion of the clay-bearing basement of the Western Arabia Terra. This region is characterized by a thinner crust compared to the rest of the highlands and by the occurrence of massive phyllosilicate-bearing materials. The origin o…
Reconstruction of a helical prominence in 3D from IRIS spectra and images
Schmieder, B.; Labrosse, N.; López Ariste, A. +3 more
Context. Movies of prominences obtained by space instruments e.g. the Solar Optical Telescope (SOT) aboard the Hinode satellite and the Interface Region Imaging Spectrograph (IRIS) with high temporal and spatial resolution revealed the tremendous dynamical nature of prominences. Knots of plasma belonging to prominences appear to travel along both …
A new solar wind-driven global dynamic plasmapause model: 2. Model and validation
Gallagher, Dennis L.; He, Fei; Liemohn, Mike W. +5 more
A new solar wind-driven global dynamic plasmapause (NSW-GDP) model has been constructed based on the largest currently available database containing 49,119 plasmapause crossing locations and 3957 plasmapause profiles (corresponding to 48,899 plasmapause locations), from 18 satellites during 1977-2015 covering four solar cycles. This model is compi…
Physical Structures of the Type Ia Supernova Remnant N103B
Walter, Frederick M.; Pan, Kuo-Chuan; Ricker, Paul M. +6 more
N103B is a Type Ia supernova remnant (SNR) projected in the outskirts of the superbubble around the rich cluster NGC 1850 in the Large Magellanic Cloud (LMC). We have obtained Hα and continuum images of N103B with the Hubble Space Telescope (HST) and high-dispersion spectra with the 4 m and 1.5 m telescopes at Cerro Tololo Inter-American Observato…
Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
Miceli, M.; Bocchino, F.; Orlando, S. +4 more
Context. The Vela supernova remnant displays several ejecta, which are fragment-like features protruding beyond the front of its primary blast shock wave. They appear to be "shrapnel", bowshock-shaped relics of the supernova explosion. One of these pieces of shrapnel (A), located in the northeastern edge of the remnant, is peculiar because its X-r…
Joining X-Ray to Lensing: An Accurate Combined Analysis of MACS J0416.1-2403
Grillo, C.; Balestra, I.; Rosati, P. +6 more
We present a novel approach for a combined analysis of X-ray and gravitational lensing data and apply this technique to the merging galaxy cluster MACS J0416.1-2403. The method exploits the information on the intracluster gas distribution that comes from a fit of the X-ray surface brightness and then includes the hot gas as a fixed mass component …
Lower hybrid waves at comet 67P/Churyumov-Gerasimenko
André, M.; Karlsson, T.; Henri, P. +9 more
We investigate the generation of waves in the lower hybrid frequency range by density gradients in the near plasma environment of comet 67P/Churyumov-Gerasimenko. When the plasma is dominated by water ions from the comet, a situation with magnetized electrons and unmagnetized ions is favourable for the generation of lower hybrid waves. These waves…
Revisiting the extremely fast disc wind in a gravitationally lensed quasar APM 08279+5255
Done, Chris; Takahashi, Tadayuki; Hagino, Kouichi +2 more
The gravitationally lensed quasar APM 08279+5255 has the fastest claimed wind from any active galactic nucleus, with velocities of 0.6-0.7c, requiring magnetic acceleration as special relativistic effects limit all radiatively driven winds to v < 0.3-0.5c. However, this extreme velocity derives from interpreting both the narrow and broad absorp…
Structure and density of Callisto's atmosphere from a fluid-kinetic model of its ionosphere: Comparison with Hubble Space Telescope and Galileo observations
Saur, Joachim; Strobel, Darrell F.; Hartkorn, Oliver
We develop a model of the ionospheric electron population of Jupiter's moon Callisto using a prescribed neutral atmosphere composed of O2, CO2 and H2O. A kinetic description of ionospheric suprathermal electrons coupled with a fluid description of ionospheric thermal electrons is well suited to jointly analyze and …