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Upper limits on hydrogen halides in Jupiter from Cassini/CIRS observations
Nixon, Conor A.; Irwin, Patrick G. J.; Fouchet, Thierry +2 more
We have determined the following upper limits for the mole fraction of hydrogen halides in Jupiter's atmosphere from Cassini/CIRS observations: [HF] <2.7×10 -11, [HCl] <2.3×10 -9, [HBr] <1.0×10 -9, [HI] <7.6×10 -9. These limits are smaller than solar composition for HF and HCl, and support th…
The Geneva-Copenhagen Survey of the Solar Neighbourhood
Pont, F.; Holmberg, J.; Nordström, B. +3 more
We report on a new survey of metallicities, ages, and Galactic orbits for a complete, magnitude-limited, and kinematically unbiased all-sky sample of 16682 nearby F- and G-dwarfs. Our~63000 new, accurate radial velocities for nearly 13500 of the stars, combined with Hipparcos parallaxes and Tycho-2 proper motions, complete the kinematic data for 1…
The unusual morphology of the intragroup medium in NGC 5171
Finoguenov, Alexis; Ponman, Trevor J.; Osmond, J. P. F.
We present the results of a 24-ks XMM-Newton observation of the NGC 5171 group of galaxies. NGC 5171 is unusual in that it is an X-ray bright group (LX > 1042 erg s-1), with irregular contours which are not centred on a bright galaxy. The global spectrum is adequately described by a single-temperature APEC model…
Conversion of bulk kinetic energy into radiation in AGNs and GRBs: Particle transport effects
Vainio, R.; Schlickeiser, R.; Pohl, M.
We investigate the spatial structure of collisionless collision fronts in relativistic outflows interacting with ambient material. As a result of the interaction, ambient particles are picked up by the outflow and generate transverse plasma waves via streaming instabilities. Pick-up particle transport under the influence of self-generated turbulen…
Probing small scale structure in the atmosphere of V471 Tauri
Walter, F. M.
The white dwarf in the eclipsing binary system V471 Tau is viewed through the atmosphere of the active K star prior to ingress and after egress. In the far UV the surface brightness of the hot white dwarf far outshines the K star emission. We can use this to probe the structure of the extended K star atmosphere along one line of sight, in absorpti…
Reconstruction of the magnetopause and low-latitude boundary layer topology using Cluster multi-point measurements
Roth, M.; Rème, H.; de Keyser, J. +6 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2381.htm?FrameEngine=false;
On the analysis of band 3 of the ISO-SWS calibration sources
Shipman, R. F.; Decin, L.; Kester, D. +4 more
We analyse ISO-SWS 01 (R ∼ 1500) 12-27.5 µm (band 3) spectra of the 10 standard calibration stars with the highest flux using synthetic spectra generated from (MARCS) atmosphere models. The comparison between the observed and synthetic spectra reveals the quality of (1) the atmospheric model construction and subsequent synthetic spectra comp…
Broadband X-ray Spectrum of XTE J1550-564 during the Outburst of 2003
Sunyaev, R. A.; Lutovinov, A. A.; Revnivtsev, M. G. +1 more
We present the INTEGRAL and RXTE X-ray observations of XTE J1550-564, a Galactic microquasar and a black hole candidate, during its outburst in the spring of 2003. The source during the outburst was in a canonical hard state, and its spectrum remained constant in both the rise and decay phases.
The Collective UV Behavior of Old Novae
Selvelli, P.
The UV spectral properties of 18 old-novae observed with IUE are examined. The de-reddened continuum energy distribution is well described by either a power-law distribution Fλ ∼λ -α with α in the range 0.3--2.5 or by a single black-body distribution with T in the range 15 000--38 000 K. The new values of EB-V ha…
Multivariate Monte Carlo Methods for the Reflection Grating Spectrometers on XMM-Newton
Kahn, S. M.; Peterson, J. R.; Jernigan, J. G.
We propose a novel multivariate Monte Carlo method as an efficient and flexible approach to analyzing extended X-ray sources with the reflection grating spectrometers (RGS) on XMM-Newton. A multidimensional interpolation method is used to efficiently calculate the response function for the RGS in conjunction with an arbitrary spatially varying spe…