Search Publications
Rotational dynamics of subsolar sublimating triaxial comets
Mysen, Eirik
A model with subsolar water sublimation on a triaxial, ellipsoidal comet nucleus is presented for the calculation of reactive torques. The resulting differential equations describing the comet's rotation are then Hamiltonian, and gravity-gradients are trivial to include. While effects derived from a weak perturbing function are neither able to cha…
The discovery of hard X-ray emission in the persistent flux of the Rapid Burster
Frontera, F.; Goldoni, P.; Stella, L. +3 more
We report the first detection with INTEGRAL of persistent hard X-ray emission (20 to 100 keV) from the Rapid Burster (MXB 1730-335), and describe its full spectrum from 3 to 100 keV. The source was detected on February/March 2003 during one of its recurrent outbursts. The source was clearly detected with a high signal to noise ratio during the sin…
Hα kinematics of a z~ 1 disc galaxy from near-infrared integral field spectroscopy
Aragón-Salamanca, A.; Swinbank, A. M.; Abraham, R. G. +6 more
In this Letter we present the first 3D spectroscopic study of Hα emission in a z~ 1 field galaxy with an integral field unit. Using the Cambridge Infrared Panoramic Survey Spectrograph (CIRPASS) on Gemini-South, we map the spatial and velocity distribution of Hα emission in the z= 0.819 galaxy CFRS 22.1313. We detect two Hα emitting regions with a…
The X-ray halo of G21.5 - 0.9
Bocchino, F.; Bandiera, R.
The emission of the plerion G21.5 - 0.9 appears more extended in X-rays than in radio. This is an unexpected result because it would imply that short-lived X-ray electrons may reach distances even larger than radio electrons. Applying an empirical relationship between dust scattering optical depth and photoelectric column density, the measured col…
High frequency ion sound waves associated with Langmuir waves in type III radio burst source regions
MacDowall, R. J.; Thejappa, G.
Short wavelength ion sound waves (2-4kHz) are detected in association with the Langmuir waves (~15-30kHz) in the source regions of several local type III radio bursts. They are most probably not due to any resonant wave-wave interactions such as the electrostatic decay instability because their wavelengths are much shorter than those of Langmuir w…
A study of the electrical charging of the Rosetta orbiter: 2. Experimental tests in a laboratory plasma
Berthelier, Jean-Jacques; Roussel, Jean-FrançOis
Following the numerical simulation presented in the companion paper, we have performed experimental tests in a plasma simulation chamber to check the results of the numerical model and validate its capability to properly predict the electrical equilibrium of the Rosetta orbiter. Since low temperature cometary plasmas cannot be directly reproduced …
Physical parameters of helium-rich subdwarf B stars from spectral energy distributions
Jeffery, C. S.; Ahmad, A.
We present effective temperatures and angular radii for eleven helium-rich subdwarf B stars. These are measured using spectral energy distributions from archival IUE spectra and existing optical and infrared photometry. The data have been analysed using a grid of high-gravity helium-rich LTE model atmospheres and a χ2-minimization proce…
XMM-Newton surveys of the Canada-France Redshift Survey fields - II. The X-ray catalogues, the properties of the host galaxies and the redshift distribution
Nandra, K.; Lilly, S.; McCracken, H. J. +5 more
We present the X-ray source catalogues for the XMM surveys of the 3-h and 14-h Canada-France Redshift Survey fields (0.5-10 keV flux range ~2 × 10-15-10-13 erg cm-2 s-1). We use a subset of the XMM sources, which have Chandra positions, to determine the best method of obtaining optical identifications of…
Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver
Balogh, A.; Lucek, E.; Gurnett, D. +3 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2337.htm?FrameEngine=false;
Mafic silicate mapping on Mars: effects of palagonitic material, multiple mafic silicates, and spectral resolution
Bell, James F.; Cloutis, Edward A.
The visible to near-infrared spectral reflectance properties of intimate and areal pyroxene + palagonitic material mixtures as well as pure mafic silicates (low-calcium pyroxene, high-calcium pyroxene, pigeonite, olivine) and mixtures of these minerals were analyzed at high spectral resolution (5 nm) as well as with non-contiguous band passes equi…