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The Enceladus and OH Tori at Saturn
Tokar, R. L.; Johnson, R. E.; Sittler, E. C. +4 more
The remarkable observation that Enceladus, a small icy satellite of Saturn, is actively venting has led to the suggestion that ejected water molecules are the source of the toroidal atmosphere observed at Saturn for over a decade using the Hubble Space Telescope (HST). Here we show that the venting leads directly to a new feature, a narrow Encelad…
Plasma Morphology at Mars. Aspera-3 Observations
Barabash, S.; Lundin, R.; Winningham, J. D. +6 more
A total of about of 400 orbits during the first year of the ASPERA-3 operation onboard the Mars Express spacecraft were analyzed to obtain a statistical pattern of the main plasma domains in the Martian space environment. The environment is controlled by the direct interaction between the solar wind and the planetary exosphere/ionosphere which res…
The XMM Large-Scale Structure survey: the X-ray pipeline and survey selection function
Chiappetti, L.; Altieri, B.; Valtchanov, I. +11 more
We present the X-ray pipeline developed for the purpose of the cluster search in the XMM Large-Scale Structure (XMM-LSS) survey. It is based on a two-stage procedure via a dedicated handling of the Poisson nature of the signal: (i) source detection on multiresolution wavelet filtered images and (ii) source analysis by means of a maximum likelihood…
On the origin and excitation of the extended nebula surrounding NGC1275
Fabian, A. C.; Johnstone, R. M.; Crawford, C. S. +1 more
We use line-of-sight velocity information on the filamentary emission-line nebula of NGC1275 to infer a dynamical model of the nebula's flow through the surrounding intracluster gas. We detect outflowing gas and flow patterns that match simulations of buoyantly rising bubbles from which we deduce that some of the nebula filaments have been drawn o…
Transiting extrasolar planetary candidates in the Galactic bulge
Brown, Thomas M.; Casertano, Stefano; Livio, Mario +13 more
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to reflex motions of their host stars, and more recently through transits of some planets across the faces of the host stars. The detection of planets with the shortest known periods, 1.2-2.5 days, has mainly result…
Spatial mapping of ices in the Ophiuchus-F core. A direct measurement of CO depletion and the formation of CO_2
Pontoppidan, K. M.
Aims.Ices in dense star-forming cores contain the bulk of volatile molecules apart from H2 and thus represent a large fraction of dark cloud chemistry budget. Mm observations of gas provide indirect evidence for significant freeze-out of CO in the densest cores. To directly constrain the freeze-out profile of CO, the formation route of CO2 and the…
New Chandra Observations of the Jet in 3C 273. I. Softer X-Ray than Radio Spectra and the X-Ray Emission Mechanism
Meisenheimer, Klaus; Jester, Sebastian; Harris, D. E. +1 more
The jet in 3C 273 is a high-power quasar jet with radio, optical, and X-ray emission, whose size and brightness allow a detailed study of the emission processes acting in it. We present deep Chandra observations of this jet and analyze the spectral properties of the jet emission from radio through X-rays. We find that the X-ray spectra are signifi…
Dynamics of thin current sheets associated with magnetotail reconnection
Balogh, A.; RèMe, H.; Fazakerley, A. N. +7 more
We have examined the detailed structure of thin current sheets and their evolution during a substorm interval on 24 August 2003, when Cluster experienced several rapid current sheet crossings within a couple of ion gyrotimes. These crossings took place during an interval of high-speed ion flows with BZ reversals and signatures of accele…
Confirmation of the planet hypothesis for the long-period radial velocity variations of β Geminorum
Guenther, E. W.; Hatzes, A. P.; Cochran, W. D. +8 more
Aims.Our aim is to confirm the nature of the long period radial velocity measurements for β Gem first found by Hatzes & Cochran (1993).
Methods: .We present precise stellar radial velocity measurements for the K giant star β Gem spanning over 25 years. An examination of the Ca II K emission, spectral line shapes from high resolution data …
20-100 keV properties of cataclysmic variables detected in the INTEGRAL/IBIS survey
Hill, A. B.; Knigge, C.; Bird, A. J. +5 more
Analysis of INTEGRAL/IBIS survey observations has revealed that the rare intermediate polar and asynchronous polar cataclysmic variables (CVs) are consistently found to emit in the 20-100 keV energy band, whereas synchronous polars and the common non-magnetic CVs rarely do so. From the correlation of a candidate INTEGRAL/IBIS survey source list wi…