Search Publications
The Slow X-Ray Expansion of the Northwestern Rim of the Supernova Remnant RX J0852.0-4622
Mori, K.; Katsuda, S.; Tsunemi, H.
The detection of the radioactive decay line of 44Ti provides unique evidence that the γ-ray source is a young (<1000 yr) supernova remnant because of the short 44Ti lifetime of ~90 yr. Only two Galactic remnants, Cassiopeia A and RX J0852.0-4622, have hitherto been reported as 44Ti line emitters, although the de…
Evidence for Polar Jets as Precursors of Polar Plume Formation
Solanki, S. K.; Henney, C. J.; Raouafi, N. -E. +2 more
Observations from the Hinode/XRT telescope and STEREO/SECCHI/EUVI are utilized to study polar coronal jets and plumes. The study focuses on the temporal evolution of both structures and their relationship. The data sample, spanning 2007 April 7-8, shows that over 90% of the 28 observed jet events are associated with polar plumes. EUV images (STERE…
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…
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…
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…
Using Global Simulations to Relate the Three-Part Structure of Coronal Mass Ejections to In Situ Signatures
Riley, Pete; Mikić, Zoran; Lionello, Roberto +1 more
White-light observations of coronal mass ejections (CMEs) often show the classic "three-part" structure consisting of (1) a bright front; (2) a dark cavity; and (3) a bright, compact core. It has proven difficult to unambiguously associate these features with in situ measurements of interplanetary CMEs (ICMEs), in all but a few cases. In this stud…
A Molecular Einstein Ring at z = 4.12: Imaging the Dynamics of a Quasar Host Galaxy Through a Cosmic Lens
Lewis, Geraint F.; Walter, Fabian; Carilli, Christopher L. +4 more
We present high-resolution (0.3'') Very Large Array imaging of the molecular gas in the host galaxy of the high-redshift quasar PSS J2322+1944 (z = 4.12). These observations confirm that the molecular gas (CO) in the host galaxy of this quasar is lensed into a full Einstein ring and reveal the internal gas dynamics in this system. The ring has a d…
Spatial Relationship between Solar Flares and Coronal Mass Ejections
Howard, R. A.; Gopalswamy, N.; Michalek, G. +2 more
We report on the spatial relationship between solar flares and coronal mass ejections (CMEs) observed during 1996-2005 inclusive. We identified 496 flare-CME pairs considering limb flares (distance from central meridian >=45°) with soft X-ray flare size >=C3 level. The CMEs were detected by the Large Angle and Spectrometric Coronagraph (LASC…