Search Publications
Measuring Dust Production in the Small Magellanic Cloud Core-Collapse Supernova Remnant 1E 0102.2-7219
Sandstrom, Karin M.; Stanimirović, Snežana; Bolatto, Alberto D. +2 more
We present mid-infrared spectral mapping observations of the core-collapse supernova remnant 1E 0102.2-7219 in the Small Magellanic Cloud using the InfraRed Spectrograph on the Spitzer Space Telescope. The remnant shows emission from fine structure transitions of neon and oxygen as well as continuum emission from dust. Comparison of the mid-IR dus…
Ion composition and chemistry in the coma of Comet 1P/Halley—A comparison between Giotto's Ion Mass Spectrometer and our ion-chemical network
Hansen, Kenneth C.; Gombosi, Tamas I.; Combi, Michael R. +3 more
In order to understand the cometary plasma environment it is important to track the closely linked chemical reactions that dominate ion evolution. We used a coupled MHD ion-chemistry model to analyze previously unpublished Giotto High Intensity Ion Mass Spectrometer (HIS-IMS) data. In this way we study the major species, but we also try to match s…
Energetic ion dynamics of the inner magnetosphere revealed in coordinated Cluster-Double Star observations
Cao, Jinbin; Dandouras, Iannis; Vallat, Claire
Since early 2004 the Chinese spacecraft Tan Ce 1 (TC-1), first component of the Double Star (DSP) mission, has been on an equatorial elliptical orbit (13.4 R E apogee), allowing the study of the dynamics of the Earth's magnetosphere in conjunction with the four European Cluster spacecraft (19.6 R E apogee). The Cluster an…
Relativistically broadened iron line in the Suzaku observation of the neutron star X-ray binary 4U 1705-44
Young, A. J.; Fabian, A. C.; Reis, R. C.
The X-ray spectra of accreting compact objects often exhibit discrete emission features associated with fluorescent emission in the accretion disc, the strongest of which is the Fe Kα fluorescence line at 6.4-6.97keV. These reflection features are amongst the best tools in the study of the inner region of accretion flow around a compact object. He…
The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy
Baudin, F.; Poretti, E.; Michel, E. +25 more
Context:
Aims: By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of…
Non-parametric strong lens inversion of SDSS J1004+4112
de Rijcke, S.; Dejonghe, H.; Liesenborgs, J. +1 more
In this article, we study the well-known strong lensing system SDSS J1004+4112. Not only does it host a large-separation lensed quasar with measured time-delay information, but several other lensed galaxies have been identified as well. A previously developed strong lens inversion procedure that is designed to handle a wide variety of constraints …
Disk Reflection Signatures in the Spectrum of the Bright Z-Source GX 340+0
Robba, N. R.; Di Salvo, T.; D'Aì, A. +2 more
We present the preliminary results of a 50 ks long XMM-Newton observation of the bright Z-source GX 340+0. In this Letter, we focus on the study of a broad asymmetric emission line in the Fe Kα energy band, whose shape is clearly resolved and compatible with a relativistically smeared profile arising from reflection on a hot accretion disk extendi…
Electron density dropout near Enceladus in the context of water-vapor and water-ice
Gurnett, D. A.; Johnson, R. E.; Kurth, W. S. +4 more
On 12 March 2008, the Cassini spacecraft made a close encounter with the Saturnian moon Enceladus, passing within 52 km of the moon. The spacecraft trajectory was intentionally-oriented in a southerly direction to create a close alignment with the intense water-dominated plumes emitted from the south polar region. During the passage, the Cassini R…
On the Propagation of p-Modes Into the Solar Chromosphere
De Pontieu, B.; McIntosh, S. W.; de Wijn, A. G.
We employ tomographic observations of a small region of plage to study the propagation of waves from the solar photosphere to the chromosphere using a Fourier phase-difference analysis. Our results show the expected vertical propagation for waves with periods of 3 minutes. Waves with 5 minute periods, i.e., above the acoustic cutoff period, are fo…
Structure of Titan's ionosphere: Model comparisons with Cassini data
Coates, A. J.; Ågren, K.; Waite, J. H. +9 more
Solar extreme ultraviolet and X-ray radiation and energetic plasma from Saturn's magnetosphere interact with the upper atmosphere producing an ionosphere at Titan. The highly coupled ionosphere and upper atmosphere system mediates the interaction between Titan and the external environment. New insights into Titan's ionosphere are being facilitated…