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Oxirane: An Exotic Oxygenated Organic Compound on Titan?
Raulin, François; Coll, Patrice; Bernard, Jean-Michel +1 more
After the discovery of CO, CO2, and more recently H2O in Titan's atmosphere, the chemistry of oxygenated organic compounds in this environment has been limited to theoretical studies only. Both kinetic and thermochemical models predict the formation of methanol and formaldehyde as the main O-organic products. Here we show tha…
Bursty energetic electrons confined in flux ropes in the cusp region
Balogh, A.; Zong, Q. -G.; Daly, P. W. +6 more
Bursty energetic electron events with energies of about 20- 400 keV have been observed in the cusp region when the CLUSTER S/C were travelling outbound on 5 April 2001. These electron events are characterized by strong impulsive increases in the flux whereas energetic ions (>30 keV) show no obvious changes. The enhanced energetic electron flux …
Rotation and outflow in the central kiloparsec of the water-megamaser galaxies IC 2560, NGC 1386, NGC 1052, and Mrk 1210
Henkel, C.; Schulz, H.
Optical emission-line profiles were evaluated in order to explore the structure of galactic nuclei containing H2O megamaser sources. Long-slit spectra of IC 2560, NGC 1386, NGC 1052 and Mrk 1210 were obtained at ~ 100 km s-1 spectral and ~ 2arcsec x 2 arcsec spatial resolution. The following individual properties of the objec…
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 …