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Vlasov Theory of the Equilibrium Structure of Tangential Discontinuities in Space Plasmas
Roth, M.; de Keyser, J.; Kuznetsova, M. M.
Extensive theoretical work has been performed on the equilibrium structure of tangential discontinuities (TDs) in collisionless plasmas. This paper reviews kinetic models based on steady-state solutions of the Vlasov equation. It is shown that most of the existing models are special cases of a generalized multi-species model. In this generalized m…
The Serendipitous Discovery of a Group or Cluster of Young Galaxies at z2.40 in Deep Hubble Space Telescope WFPC2 Images
Keel, W. C.; Driver, S. P.; Ostrander, E. J. +2 more
We report the serendipitous discovery of a group or cluster of young galaxies at z ~= 2.40 in a 24 orbit Hubble Space Telescope/WFPC2 exposure of the field around the weak radio galaxy 53W002. Potential cluster members were identified on ground-based narrowband redshifted Ly alpha images and confirmed via spectroscopy. In addition to the known wea…
Ulysses observations of differential alpha-proton streaming in the solar wind
Smith, E. J.; Goldstein, B. E.; Neugebauer, M. +1 more
Data from the solar wind spectrometer on the Ulysses spacecraft are used to study the differential streaming between the alpha particles and protons in the solar wind over the heliographic distance range of 1.3 to 5.4 AU and latitudes from 0° to +/-80° during the period December 1990 through September 1995. The study is based on 6-hour averages of…
Infrared spectrophotometry of NGC 7023 with ISOCAM.
Palazzi, E.; Perault, M.; Abergel, A. +4 more
We present spectrophotometric observations of the reflection nebula NGC 7023 obtained with the ISOCAM Circular Variable Filter (CVF) in the spectral range 5.15 to 16.5µm. Maps in the 16µm continuum emission and in the Unidentified Infrared Bands (UIBs) have been obtained. The continuum emission peaks at the dense interface between the …
Spatial variation of >40MeV/n nuclei fluxes observed during the ULYSSES rapid latitude scan.
Kunow, H.; Wibberenz, G.; Potgieter, M. S. +7 more
In this paper we present fluxes of galactic cosmic ray nuclei with energies above 40MeV/n observed by the Kiel Electron Telescope on board the Ulysses spacecraft during the fast scan from the South Pole (September 1994) to the North Pole (July 1995). This part of the Ulysses orbit gives us the unique opportunity to investigate spatial modulation o…
Hubble Space Telescope Observations of the Luminous IRAS Source FSC 10214+4724: A Gravitationally Lensed Infrared Quasar
Hogg, David W.; Eisenhardt, Peter R.; Soifer, B. T. +3 more
With a redshift of 2.3, the IRAS source FSC 10214+4724 is apparently one of the most luminous objects known in the universe. We present an image of FSC 10214+4724 at 0.8 microns obtained with the Hubble Space Telescope (HST) WFPC2 Planetary Camera. The source appears as an unresolved (<0.06") arc 0.7" long, with significant substructure along i…
ISO-SWS observations of solid state features towards RAFGL 7009S.
Boulanger, F.; Ehrenfreund, P.; Dartois, E. +6 more
We report the detection of various solid state molecular features in the SWS01 spectrum of a protostellar object, RAFGL 7009S. Identified molecules include H_2_O, CO, CO_2_ together with ^13^CO_2_ and CH_4_. Other less firmly identified features are observed that appear in laboratory spectra of UV photolysed ices. We thus confirm the previous dete…
The Main Sequence and a White Dwarf Sequence in the Globular Cluster NGC 6397
Piotto, Giampaolo; Cool, Adrienne M.; King, Ivan R.
We present a deep color-magnitude diagram of the nearby globular cluster NGC 6397, from V and I images obtained with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope (HST). A narrow main sequence extending ∼10 mag below the turnoff is delineated, as well as a white dwarf sequence spanning 3.5 mag. The main sequence has a 1 σ…
The M(v)^HB Verses [Fe/H] Calibration. I. HST Color-Magnitude Diagrams of Eight Globular Clusters in M31
Djorgovski, S. G.; Cacciari, C.; Rich, R. M. +6 more
Color magnitude diagrams (CMDs) of individual stars in 8 globular clusters (GCs) in M3 1 down to about 1 mag fainter (V∼26.5) than the horizontal branch (HB) have been obtained with the Hubble Space Telescope-HST. In particular, we observed G280 and G35 1 with the FOC (f/96 + F430W and f/96+F480LP) while the WFPC2 (F555W, F814W) frames for G1, G58…
Variation of electron-strahl width in the high-speed solar wind: ULYSSES observations.
McComas, D. J.; Forsyth, R. J.; Phillips, J. L. +2 more
Halo electron velocity distributions have been surveyed during the first full Ulysses southern polar pass from January 1994 through April 1995. The data examined range from approximately 50degS heliolatitude to the maximum poleward extent of the Ulysses orbit, approximately 80degS, and then back through the solar equator to 35degN heliolatitude. D…