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The Grain Impact Analyser and Dust Accumulator (GIADA) Experiment for the Rosetta Mission: Design, Performances and First Results
Fulle, M.; Rodriguez, J.; Colangeli, L. +13 more
The Grain Impact Analyser and Dust Accumulator (GIADA) onboard the ROSETTA mission to comet 67P/Churyumov-Gerasimenko is devoted to study the cometary dust environment. Thanks to the rendezvous configuration of the mission, GIADA will be plunged in the dust environment of the coma and will be able to explore dust flux evolution and grain dynamic p…
Thinning and stretching of the plasma sheet
Petrukovich, A. A.; Balogh, A.; RèMe, H. +3 more
With Cluster observations in the magnetotail we study dynamics of plasma sheet thinning and stretching during 39 intervals associated with substorm growth phases. The cross-tail current density and normal magnetic field generally scale as Bn ∼ TpNp1/2/J0, but with frequent transient variations…
Mupus A Thermal and Mechanical Properties Probe for the Rosetta Lander Philae
Banaszkiewicz, Marek; Zarnecki, John C.; Spohn, Tilman +14 more
MUPUS, the multi purpose sensor package onboard the Rosetta lander PHILAE, will measure the energy balance and the physical parameters in the near-surface layers - up to about 30 cm depth- of the nucleus of Rosetta's target comet Churyumov-Gerasimenko. Moreover it will monitor changes in these parameters over time as the comet approaches the sun. …
A Keck Spectroscopic Survey of MS 1054-03 (z = 0.83): Forming the Red Sequence
Franx, Marijn; Kelson, Daniel D.; Illingworth, Garth D. +4 more
Using a magnitude-limited, spectroscopic survey of the X-ray-luminous galaxy cluster MS 1054-03, we isolate 153 cluster galaxies and measure MS 1054's redshift and velocity dispersion to be z=0.8307+/-0.0004 and σz=1156+/-82 km s-1. The absorption-line, poststarburst (``E+A''), and emission-line galaxies, respectively, make u…
Ionospheric electrons in Titan's tail: Plasma structure during the Cassini T9 encounter
Coates, A. J.; Hartle, R. E.; Sittler, E. C. +6 more
We present results from the CAPS electron spectrometer obtained during the downstream flyby of Titan on 26 December 2005, which occurred during a period of enhanced plasma pressure inside the magnetosphere. The electron data show an unusual split signature with two principal intervals of interest outside the nominal corotation wake. Interval 1 sho…
Electron sources in Saturn's magnetosphere
André, N.; Coates, A. J.; Dougherty, M. K. +11 more
We investigate the sources of two different electron components in Saturn's inner magnetosphere (5 < L < 12 Rs) by performing phase space density (f(v)) analyses of electron measurements made by the Cassini CAPS instrument (1 eV to 28 keV). Because pitch angle distributions indicate that the traditional single particle invariants of gyration…
Convection in Enceladus' ice shell: Conditions for initiation
McKinnon, William B.; Barr, Amy C.
Observations of Enceladus by the Cassini spacecraft indicate that this tiny Saturnian moon is geologically active, with plumes of water vapor and ice particles erupting from its southern polar region. This activity suggests that tidal dissipation has become spatially localized, perhaps due to a compositional, rheological, and/or thermal anomaly in…
Twisting Motions of Sunspot Penumbral Filaments
Kubo, M.; Lites, B. W.; Ichimoto, K. +8 more
The penumbra of a sunspot is composed of numerous thin, radially extended, bright and dark filaments carrying outward gas flows (the Evershed flow). Using high-resolution images obtained by the Solar Optical Telescope aboard the solar physics satellite Hinode, we discovered a number of penumbral bright filaments revealing twisting motions about th…
Physical properties of z ~ 4 LBGs: differences between galaxies with and without Lyα emission
Pentericci, L.; Santini, P.; Fontana, A. +5 more
Aims:We analysed the physical properties of z ∼4 Lyman Break Galaxies observed in the GOODS-S survey, in order to investigate possible differences between galaxies where the Lyα is present in emission, and those where the line is absent or in absorption.
Methods: The objects were selected from their optical color and then spectroscopically con…
Shock Heating in the Nearby Radio Galaxy NGC 3801
Hardcastle, M. J.; Croston, J. H.; Kraft, R. P.
We report the Chandra detection of shock-heated shells of hot gas surrounding the radio lobes of the nearby (DL~53 Mpc) low-power radio galaxy NGC 3801. The shells have temperatures of 1 and 0.7 keV, compared to an ISM temperature of 0.23 keV. The estimated expansion speed of the shells is ~850 km s-1, corresponding to a Mach…