Search Publications
Submillimeter Imaging of RCS J022434-0002.5: Intense Activity in a High-Redshift Cluster?
Gladders, M. D.; Ivison, R. J.; Hoekstra, H. +4 more
We present deep 850 µm imaging of the z=0.773 strong lensing galaxy cluster RCS J022434-0002.5 from the Red-Sequence Cluster Survey (RCS). These data are part of a larger submillimeter survey of RCS clusters with SCUBA on the JCMT. We find five objects at 850 µm, all of which are also detected at either 1.4 GHz or 450 µm, or both…
INTEGRAL broadband X-ray spectrum of the intermediate polar V709 Cassiopeiae
Bonnet-Bidaud, J. M.; Falanga, M.; Suleimanov, V.
We present the hard X-ray time-averaged spectrum of the intermediate polar V709 Cas observed with INTEGRAL. We performed the observation using data from the IBIS/ISGRI instrument in the 20-100 keV energy band and from JEM-X at lower energy (5-20 keV). Using different multi-temperature and density X-ray post-shock models we measured an improved pos…
The chemical composition of δ Scuti⋆
Kovtyukh, V.; Soubiran, C.; Kim, Chulhee +4 more
We present chemical abundances in the photosphere of δ Scuti (δ Sct) - a prototype of the class of pulsating variables - determined from the analysis of a spectrum obtained by using the 2-m telescope at the Peak Terskol Observatory and a high-resolution spectrometer with R= 52 000, a signal-to-noise ratio 250 and from International Ultraviolet Exp…
The Proto-Planetary Nebula M1-92 and the Symbiotic Star MWC 560: Two Evolutionary Phases of the Same Type of Object?
Torres-Peimbert, S.; Georgiev, L.; Arrieta, A.
Important similarities between the objects M1-92, a proto-planetary nebula of bipolar morphology, and MWC 560, a symbiotic star with a jet, have been found. A brief review of the previous studies for both objects is presented for the purpose of proposing mechanisms that best explain these similarities, since up to now both objects have been studie…
Hubble Space Telescope observations of the nucleus fragment 73P/Schwassmann Wachmann 3-C
Lamy, P.; Toth, I.; Weaver, H. A.
The investigation of fragmented comets provides information on the physical properties and internal structure of cometary nuclei, as well as insights into the mechanisms responsible for cometary breakups. The Jupiter-family Comet 73P/Schwassmann-Wachmann 3 (73P/SW3) fragmented non-tidally into at least four components, and probably more, in the au…
Fe VII lines in the spectrum of RR Telescopii
Young, P. R.; Lobel, A.; Berrington, K. A.
Thirteen transitions within the ground 3d2 configuration of Fe vii are identified in ultraviolet and optical spectra of the symbiotic star RR Telescopii obtained with the STIS instrument of the Hubble Space Telescope. The line fluxes are compared with theoretical data computed with the recent atomic data of Berrington et al., and high r…
An update on the ring exosphere and plasma disc of Saturn
Ip, W. -H.
A re-examination of the mass budget of the ring exosphere of Saturn - as prompted by the most recent Cassini measurements in the vicinity of the ring system - indicates that the corresponding number density could reach the level of 2-3 × 105 cm-3 at maximum. Such extended exospheric structure in equilibrium with a thin ring p…
Complex geology of two large impact craters in Tyrrhena Terra, Mars: Detailed analysis using MEX HRSC camera data
Neukum, G.; Korteniemi, J.; Kostama, V. -P. +5 more
Tyrrhena Terra, located just north of the roughly 200 km Hellas impact basin, is a typical region of the ancient cratered southern highlands on Mars. Its base material is a mixture of Hellas ejecta, prebasin remnants, and highland terrain, all later saturated with smaller (<200 km) impact craters. Fluvial and lacustrine deposits, erosion, tecto…
Multipoint Observations of Ionic Structures in the Plasmasphere by CLUSTER-CIS and Comparisons With IMAGE-EUV Observations and With Model Simulations
Parks, George K.; Dandouras, Iannis; Vallat, Claire +12 more
The 4 Cluster spacecraft orbit the Earth in a highly eccentric polar orbit at 4 RE perigee, and this permits them to sample the ring current, the radiation belts and the outer plasmasphere. Data provided by the Cluster Ion Spectrometry (CIS) instruments are used to analyze Cluster crossings of the plasmasphere. CIS is capable of obtaini…
Chandra and XMM-Newton Observations of the Exceptional Pulsar B0628-28
Ögelman, H.; Tepedelenlıoǧlu, E.
PSR B0628-28 is a radio pulsar that was first detected in the X-ray band by ROSAT and then later observed with Chandra and XMM-Newton. The Chandra observation yielded an X-ray luminosity 2 orders of magnitude higher than what is expected for spin-powered pulsars; also, there were no pulsations detected. The XMM-Newton observation, however, reveals…