Search Publications
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…
A search for counterparts to massive X-ray binaries using photometric catalogues
Negueruela, I.; Schurch, M. P. E.
Context: The X-ray and γ-ray observatory INTEGRAL has discovered large numbers of new hard X-ray sources, many of which are believed to be high mass X-ray binaries. However, for a significant fraction, their counterparts remain unidentified.
Aims: We explore the use of photometric catalogues to find optical counterparts to high mass X-ray bina…
Hinode EUV Study of Jets in the Sun's South Polar Corona
Harra, Louise K.; Doschek, George A.; Lundquist, Loraine L. +8 more
A number of coronal bright points and associated plasma jet features were seen in an observation of the South polar coronal hole during 2007 January. The 40" wide slot was used at the focus of the Hinode EUV Imaging Spectrometer to provide spectral images for two of these events. Light curves are plotted for a number of emission lines that include…