Search Publications
Simultaneous Multi-Wavelength Observations of Sgr A* During 2007 April 1-11
Grosso, N.; Dowell, C. D.; Porquet, D. +18 more
We report the detection of variable emission from Sgr A* in almost all wavelength bands (i.e., centimeter, millimeter, submillimeter, near-IR, and X-rays) during a multi-wavelength observing campaign. Three new moderate flares are detected simultaneously in both near-IR and X-ray bands. The ratio of X-ray to near-IR flux in the flares is consisten…
The Distribution of Dark Matter Over Three Decades in Radius in the Lensing Cluster Abell 611
Richard, Johan; Treu, Tommaso; Marshall, Philip J. +5 more
We present a detailed analysis of the baryonic and dark matter distribution in the lensing cluster Abell 611 (z = 0.288), with the goal of determining the dark matter profile over an unprecedented range of cluster-centric distance. By combining three complementary probes of the mass distribution, weak lensing from multi-color Subaru imaging, stron…
Imaging the Interaction of the Heliosphere with the Interstellar Medium from Saturn with Cassini
Hsieh, K. C.; Krimigis, S. M.; Mitchell, D. G. +2 more
We report an all-sky image of energetic neutral atoms (ENAs) >6 kilo-electron volts produced by energetic protons occupying the region (heliosheath) between the boundary of the extended solar atmosphere and the local interstellar medium (LISM). The map obtained by the Ion and Neutral Camera (INCA) onboard Cassini reveals a broad belt of energet…
Detection of dusty plasma near the E-ring of Saturn
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +12 more
We present several independent in-situ measurements, which provide evidence that charged dust in the E-ring interacts collectively with the dense surrounding plasma disk of Saturn, i.e., form a system of dust-plasma interaction. The results are based on data sampled by the Radio and Plasma Wave Science (RPWS) investigation onboard Cassini, which a…
HD 50844: a new look at δ Scuti stars from CoRoT space photometry
Auvergne, M.; Amado, P. J.; Baudin, F. +21 more
Context:
Aims: This work presents the results obtained by CoRoT on HD 50844, the only δ Sct star observed in the CoRoT initial run (57.6 d). The aim of these CoRoT observations was to investigate and characterize for the first time the pulsational behaviour of a δ Sct star, when observed at a level of precision and with a much better duty cycl…
Ring Particle Composition and Size Distribution
Spilker, Linda; Clark, Roger; Filacchione, Gianrico +4 more
We review recent progress concerning the composition and size distribution of the particles in Saturn's main ring system, and describe how these properties vary from place to place. We discuss how the particle size distribution is measured, and how it varies radially. We note the discovery of unusually large "particles" in restricted radial bands.…
A new model to simulate the Martian mesoscale and microscale atmospheric circulation: Validation and first results
Forget, François; Spiga, Aymeric
The Laboratoire de Météorologie Dynamique (LMD) Mesoscale Model is a new versatile simulator of the Martian atmosphere and environment at horizontal scales ranging from hundreds of kilometers to tens of meters. The model combines the National Centers for Environmental Prediction(NCEP)-National Center for Atmospheric Research (NCAR) fully compressi…
Radial distribution of the multiple stellar populations in ω Centauri
Anderson, J.; Milone, A. P.; Momany, Y. +4 more
Aims: We present a detailed study of the radial distribution of the multiple populations identified in the Galactic globular cluster ω Cen.
Methods: We used both space-based images (ACS/WFC and WFPC2) and ground-based images (FORS1@VLT and WFI@2.2m ESO telescopes) to map the cluster from the inner core to the outskirts ( 20 arcmin). These data…
The SLACS Survey. VIII. The Relation between Environment and Internal Structure of Early-Type Galaxies
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +5 more
We study the relation between the internal structure of early-type galaxies and their environment using 70 strong gravitational lenses from the SLACS Survey. The Sloan Digital Sky Survey (SDSS) database is used to determine two measures of overdensity of galaxies around each lens—the projected number density of galaxies inside the tenth nearest ne…
Determining Titan surface topography from Cassini SAR data
Cassini RADAR Team; Stiles, Bryan W.; Kirk, Randolph L. +17 more
A technique, referred to as SARTopo, has been developed for obtaining surface height estimates with 10 km horizontal resolution and 75 m vertical resolution of the surface of Titan along each Cassini Synthetic Aperture Radar (SAR) swath. We describe the technique and present maps of the co-located data sets. A global map and regional maps of Xanad…