Search Publications
XMM-Newton observation of the interacting cluster Abell 3528
Molendi, S.; Gastaldello, F.; Venturi, T. +3 more
We analyze the XMM-Newton dataset of the interacting cluster of galaxies Abell 3528 located westward in the core of the Shapley Supercluster, the largest concentration of mass in the nearby Universe. A3528 is formed by two interacting clumps (A3528-N at North and A3528-S at South) separated by 0.9 h70-1 Mpc at redshift 0.053.…
Cl 1358+62: Characterizing the Physical Properties of Cluster Galaxies at z = 0.33
Franx, Marijn; Tran, Kim-Vy H.; Simard, Luc +1 more
We examine the physical properties of 173 cluster members in Cl 1358+62 (z=0.3283) from Hubble Space Telescope Wide Field Planetary Camera 2 imaging taken in the F606W (~rest-frame B) and F814W (~rest-frame V) filters over a 2.2×2.2 Mpc2 field (H0=100 km s-1 Mpc-1, ΩM=0.3, ΩΛ=0.7). …
Accretion and Outflow in Interacting Binary Systems: Far Ultraviolet Spectroscopic Explorer Observations of the Nova-like Cataclysmic Variable UX Ursae Majoris
Long, Knox S.; Froning, Cynthia S.; Knigge, Christian
We present far-ultraviolet (905-1182 Å), time-series spectroscopy of the eclipsing, nova-like cataclysmic variable UX UMa acquired with Far Ultraviolet Spectroscopic Explorer (FUSE). The time-averaged spectrum is complex and is dominated by overlapping spectral features. The most prominent features are emission lines of C III, N III, N IV, and O V…
Fitting optical source counts with an infrared-defined model: insights into galaxy evolution
Rowan-Robinson, M.; King, A. J.
In order to improve the fit to the optical counts, the recent multiwavelength source count model of Rowan-Robinson is improved in two ways. First, density evolution is incorporated to correspond to the mergers in hierarchical models of galaxy formation. Secondly, the evolution of dust opacity is taken into account. The luminosity and density evolu…
Hubble Space Telescope Spectroscopy of the Unexpected 2001 July Outburst of the Dwarf Nova WZ Sagittae
Szkody, Paula; Howell, Steve B.; Sion, Edward M. +8 more
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph E140M spectra of the dwarf nova WZ Sge, following the early superoutburst of 2001 July. Our four far-ultraviolet (FUV) spectra, obtained over a time span of 4 months, monitor changes in the hot component of the system during the decline phase. The spectra cover the wavele…
The XMM-Newton serendipitous source catalogue
Pietsch, W.; Motch, C.; Boller, Th. +17 more
We describe the production, properties and scientific potential of the XMM-Newton catalogue of serendipitous X-ray sources. The first version of this catalogue is nearing completion and is planned to be released in early 2003.
Coronal Magnetic Field Context of Simple CMEs Inferred from Global Potential Field Models
Luhmann, J. G.; Yashiro, Seiji; Zhao, Xuepu +1 more
Most work on coronal mass ejection (CME) interpretation focuses on the involved active region rather than on the large-scale coronal context. In this paper a global potential-field source-surface model of the coronal magnetic field is used to evaluate the sensitivity of the coronal field configuration to the location, orientation, and strength of …
Central Proper-Motion Kinematics of NGC 6752
Bailyn, C. D.; Drukier, G. A.; Van Altena, W. F. +1 more
We present proper motions derived from Wide Field Planetary Camera 2 (WFPC2) imaging for stars in the core of the peculiar globular cluster NGC 6752. The central velocity dispersion in both components of the proper motion is 12 km s-1. We discuss the implications of this result, as well as the intrinsic difficulties in making such measu…
Astrometric Positions and Proper Motions of 19 Radio Stars
Zacharias, N.; Claussen, M. J.; de Vegt, C. +4 more
We have used the Very Large Array, linked with the Pie Town Very Long Baseline Array antenna, to determine the astrometric positions of 19 radio stars in the International Celestial Reference Frame (ICRF). The positions of these stars were directly linked to the positions of distant quasars through phase-referencing observations. The positions of …
Helium Abundance in the Corona and Solar Wind: Gyrotropic Modeling from the Chromosphere to 1 AU
Hansteen, Viggo H.; Lie-Svendsen, Øystein; Leer, Egil
We have developed a solar wind model including helium that extends from the chromosphere to 1 AU. The model is based on the gyrotropic approximation to the 16-moment set of fluid transport equations, which allows it to accommodate temperature anisotropies, as well as nonclassical heat transport. We find that, as in a pure electron-proton solar win…