Search Publications
Identifying Stellar Streams in the First RAVE Public Data Release
Rix, H. -W.; Klement, R.; Fuchs, B.
We have searched for and detected stellar streams or moving groups in the solar neighborhood, using the data provided by the first RAVE public data release. This analysis is based on distances to RAVE stars estimated from a color-magnitude relation calibrated on Hipparcos stars. Our final sample consists of 7015 stars selected to be within 500 pc …
Improved Constraints on the Preferential Heating and Acceleration of Oxygen Ions in the Extended Solar Corona
Kohl, John L.; Cranmer, Steven R.; Panasyuk, Alexander V.
We present a detailed analysis of oxygen ion velocity distributions in the extended solar corona, based on observations made with the Ultraviolet Coronagraph Spectrometer (UVCS) on the SOHO spacecraft. Polar coronal holes exhibit broad line widths and unusual intensity ratios of the O VI λλ1032, 1037 emission-line doublet. A traditional interpreta…
IMAGES. II. A surprisingly low fraction of undisturbed rotating spiral disks at z ~ 0.6 The morpho-kinematical relation 6 Gyr ago
Cesarsky, C.; Östlin, G.; Yang, Y. +21 more
We present a first combined analysis of the morphological and dynamical properties for the intermediate-mass Galaxy Evolution Sequence (IMAGES) sample. It is a representative sample of 52 z∼0.6 galaxies with M_stell from 1.5 to 15 × 1010~M⊙ that possesses 3D resolved kinematics and HST deep imaging in at least two broad band …
Transiting exoplanets from the CoRoT space mission. IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
Mazeh, T.; Aigrain, S.; Zucker, S. +32 more
CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the tra…
Identifying Current-Sheet-like Structures in the Solar Wind
Li, G.
In past years, measurements of the solar wind plasma have advanced our understanding of MHD turbulence tremendously. At small scales, the solar wind is believed to be ve`xry multifractal with nonlinear interactions causing an intermittent energy dissipation, leading to possible current-sheet structures. In this Letter, we propose a systematic data…
Evidence for temporal variability of Enceladus' gas jets: Modeling of Cassini observations
Dougherty, Michele K.; Saur, Joachim; Simon, Sven +5 more
Time variability of Enceladus' gas plume is deduced from a joint investigation of Cassini spacecraft magnetic field data obtained during the first three flybys E0, E1 and E2 and neutral density measurements during the E2 flyby with a model that describes Enceladus' plasma interaction with individual jets. We infer a total plume content of ~7 × 10<…
A Space Telescope Imaging Spectrograph Survey for O VI Absorption Systems at 0.12 < z lesssim 0.5. II. Physical Conditions of the Ionized Gas
Chen, Hsiao-Wen; Thom, C.
We present a complete catalog of 27 O VI absorbers at low redshift (0.12 < z < 0.5) from a blind survey of 16 QSO echelle spectra in the Hubble Space Telescoep Space Telescope Imaging Spectrograph data archive. These absorbers are identified based only on matching line profiles and the expected doublet ratio between the λλ1031, 1037 transiti…
Outburst of the 2 s Anomalous X-Ray Pulsar 1E 1547.0-5408
Camilo, F.; Ransom, S. M.; Gotthelf, E. V. +2 more
Following our discovery of radio pulsations from the newly recognized anomalous X-ray pulsar (AXP) 1E 1547.0-5408, we initiated X-ray monitoring with the Swift X-ray telescope and obtained a single target-of-opportunity observation with the Newton X-ray Multi-Mirror Mission (XMM-Newton). In comparison with its historic minimum flux of 3 × 10-…
Structure and Kinematics of Molecular Disks in Fast-Rotator Early-Type Galaxies
Cappellari, Michele; Bureau, Martin; Young, Lisa M.
We present interferometric observations resolving the CO emission in the four gas-rich lenticular galaxies NGC 3032, NGC 4150, NGC 4459, and NGC 4526, and we compare the CO distribution and kinematics to those of the stars and ionized gas. Counterrotation documents an external origin for the gas in at least one case (NGC 3032), and the comparisons…
Recent in-situ observations of magnetic reconnection in near-Earth space
Paschmann, Götz
The paper presents a brief review of recent in-situ observations of reconnection in space, with emphasis on results pertaining to the question of anti-parallel versus component reconnection, the implied spatial and temporal scales, the location of the reconnection sites, particle acceleration, reconnection rates, the dependence on plasma β, and th…