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PMN J1632-0033: A New Gravitationally Lensed Quasar
Winn, Joshua N.; Kochanek, Christopher S.; Morgan, Nicholas D. +6 more
We report the discovery of a gravitationally lensed quasar resulting from our survey for lenses in the southern sky. Radio images of J1632-0033 with the Very Large Array and the Australia Telescope Compact Array exhibit two compact, flat-spectrum components with separation 1.47" and flux density ratio 13.2. Images with the Hubble Space Telescope r…
Effects of the heliospheric interface on the interplanetary Lyman alpha glow seen at 1 AU from the Sun
Izmodenov, V.; Quémerais, E.
This work presents multiple scattering computations of interplanetary background line profiles using Angle Dependent Partial Frequency Redistribution to model the scattering process as explained by Quémerais (\cite{Quemerais00}). The density and velocity distribution of hydrogen atoms in the heliosphere was computed using a self-consistent model o…
Imaging of z~2 QSO Host Galaxies with the Hubble Space Telescope
Hutchings, J. B.; Mo, J.; Neff, S. G. +4 more
We report on deep imaging in two filters with the planetary camera of the Hubble Space Telescope of five QSOs at redshift of ~2, with a range of optical and radio luminosity. The observations included a suite of point-spread function (PSF) observations that were used to construct new PSF models, described elsewhere by Dumont et al. The new PSF mod…
Losing Weight: A Keck Spectroscopic Survey of the Massive Cluster of Galaxies RX J1347-1145
Kneib, Jean-Paul; Cohen, Judith G.
We present a sample of 47 spectroscopically confirmed members of RX J1347-1145, the most luminous X-ray cluster of galaxies discovered to date. With two exceptions, all the galaxies in this sample have red B-R colors and red spectral indices, with spectra similar to old local elliptical galaxies. Using all 47 cluster members, we derive a mean reds…
Cluster magnetic field observations at a quasi-parallel bow shock
Balogh, A.; Horbury, T. S.; Lucek, E. A. +7 more
We present four-point Cluster magnetic field data from a quasi-parallel shock crossing which allows us to probe the three-dimensional structure of this type of shock for the first time. We find that steepened ULF waves typically have a scale larger than the spacecraft separation ( ~ 400 1000 km), while SLAMS-like magnetic field enhancements have d…
Hubble Space Telescope Space Telescope Imaging Spectrograph Search for an Atmosphere on Callisto: A Jovian Unipolar Inductor
Saur, Joachim; Feldman, Paul D.; Strobel, Darrell F. +1 more
Hubble Space Telescope observations of Callisto with the Space Telescope Imaging Spectrograph were performed at both eastern and western elongations to search for the UV emissions diagnostic of the presence of O2, CO2, and/or CO atmospheres. We report upper limits of 5×10-5 photons cm-2 s-1 or…
Solar differential rotation determined by tracing coronal bright points in SOHO-EIT images. II. Results for 1998/99 obtained with interactive and automatic methods
Vršnak, B.; Wöhl, H.; Clette, F. +3 more
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) were used to analyse solar differential rotation by tracing coronal bright points. The results obtained with the interactive and the automatic method for the time period June 4, 1998 to May 22, 1999 are presen…
Crystalline silicates in the envelopes and discs around oxygen-rich asymptotic giant branch stars
Suh, Kyung-Won
We have modelled dust envelopes and discs around oxygen-rich asymptotic giant branch (AGB) stars using optical properties of amorphous and crystalline silicate dust grains, paying close attention to the infrared observations of the stars including the Infrared Space Observatory (ISO ) data. Using the opacity functions for various mixtures of amorp…
On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems
Smalley, B.; Bessell, M. S.; Kupka, F. +1 more
In previous work, Gardiner et al. (\cite{GKS99}) found evidence for a discrepancy between the Teff obtained from Balmer lines with that from photometry and fundamental values for A-type stars. An investigation into this anomaly is presented using Balmer line profiles of stars in binary system with fundamental values of both Teff
An atlas of 2.4 to 4.1 mu m ISO/SWS spectra of early-type stars
Waters, L. B. F. M.; Kaper, L.; Hony, S. +5 more
We present an atlas of spectra of O- and B-type stars, obtained with the Short Wavelength Spectrometer (SWS) during the Post-Helium program of the Infrared Space Observatory (ISO). This program is aimed at extending the Morgan & Keenan classification scheme into the near-infrared. Later type stars will be discussed in a separate publication. T…