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On the Polar Caps of the Three Musketeers
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +2 more
XMM-Newton EPIC observations of PSR B0656+14, PSR B1055-52, and Geminga have substantially increased the collection of statistics available for these three isolated neutron stars, so apparently similar to deserve the nickname of the Three Musketeers, given to them by Becker & Trümper. Here we take advantage of the EPIC statistics to perform ph…
Cassini Imaging Science: Initial Results on Phoebe and Iapetus
Burns, J. A.; Neukum, G.; Wagner, R. +32 more
The Cassini Imaging Science Subsystem acquired high-resolution imaging data on the outer Saturnian moon, Phoebe, during Cassini's close flyby on 11 June 2004 and on Iapetus during a flyby on 31 December 2004. Phoebe has a heavily cratered and ancient surface, shows evidence of ice near the surface, has distinct layering of different materials, and…
MCG-6-30-15: long time-scale X-ray variability, black hole mass and active galactic nuclei high states
Uttley, P.; Goad, M. R.; McHardy, I. M. +1 more
We present a detailed study of the long time-scale X-ray variability of the Seyfert 1 Galaxy MCG-6-30-15, based on eight years of frequent monitoring observations with the Rossi X-ray Timing Explorer. When combined with the published short-time-scale XMM-Newton observations, we derive the power-spectral density (PSD) covering six decades of freque…
Statistical Constraints for Astrometric Binaries with Nonlinear Motion
Makarov, V. V.; Kaplan, G. H.
Useful constraints on the orbits and mass ratios of astrometric binaries in the Hipparcos catalog are derived from the measured proper motion differences of Hipparcos and Tycho-2 (Δµ), accelerations of proper motions (µ˙), and second derivatives of proper motions (µ̈). It is shown how, in some cases, statistical bounds can be esti…
Complex organic matter in Titan's atmospheric aerosols from in situ pyrolysis and analysis
Steller, M.; Atreya, S. K.; Owen, T. +19 more
Aerosols in Titan's atmosphere play an important role in determining its thermal structure. They also serve as sinks for organic vapours and can act as condensation nuclei for the formation of clouds, where the condensation efficiency will depend on the chemical composition of the aerosols. So far, however, no direct information has been available…
Sub-arcsec imaging of the AB Aur molecular disk and envelope at millimeter wavelengths: a non Keplerian disk
Guilloteau, S.; Dutrey, A.; Piétu, V.
We present sub-arcsecond images of AB Auriga obtained with the IRAM Plateau de Bure interferometer in the isotopologues of CO, and in continuum at 3 and 1.3 mm. These observations allow us to trace the structure of the circumstellar material of
Cassini Imaging Science: Initial Results on Saturn's Rings and Small Satellites
Burns, J. A.; Neukum, G.; Wagner, R. +32 more
Images acquired of Saturn's rings and small moons by the Cassini Imaging Science Subsystem (ISS) during the first 9 months of Cassini operations at Saturn have produced many new findings. These include new saturnian moons; refined orbits of new and previously known moons; narrow diffuse rings in the F-ring region and embedded in gaps within the ma…
Spectroscopy of Red Giants in the Large Magellanic Cloud Bar: Abundances, Kinematics, and the Age-Metallicity Relation
Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III +1 more
We report metallicities and radial velocities derived from spectra at the near-infrared calcium triplet for 373 red giants in a 200 arcmin2 area at the optical center of the LMC bar. These are the first spectroscopic abundance measurements of intermediate-age and old field stars in the high surface brightness heart of the LMC. The metal…
A Sporadic Third Layer in the Ionosphere of Mars
Pätzold, M.; Häusler, B.; Tellmann, S. +3 more
The daytime martian ionosphere has been observed as a two-layer structure with electron densities that peak at altitudes between about 110 and 130 kilometers. The Mars Express Orbiter Radio Science Experiment on the European Mars Express spacecraft observed, in 10 out of 120 electron density profiles, a third ionospheric layer at altitude ranges o…
Evidence for a Massive Poststarburst Galaxy at z~6.5
Panagia, N.; Stern, D.; Dickinson, M. +28 more
We describe results from a search for high-redshift J-band ``dropout'' galaxies in the portion of the Great Observatories Origins Deep Survey (GOODS) southern field that is covered by extremely deep imaging from the Hubble Ultradeep Field (HUDF). Using observations at optical, near-infrared, and mid-infrared wavelengths from the Hubble and Spitzer…