Search Publications
The Hubble Space Telescope WFPC2 B-Band Parallel Survey: A Study of Galaxy Morphology for Magnitudes 18<=B<=27
Driver, Simon P.; Windhorst, Rogier A.; Cohen, Seth H. +2 more
We present the results of the Hubble Space Telescope B-Band Parallel Survey (BBPS). It covers 0.0370 deg2 and consists of 31 shallow (four- to six-orbit), randomly selected high-latitude HST WFPC2 parallel fields with images taken in both the B (F450W) and I (F814W) filters. The goal of this survey is to morphologically classify the gal…
FUSE Measurements of Rydberg Bands of Interstellar CO between 925 and 1150 Å
Andersson, B. -G.; Federman, S. R.; Sheffer, Y.
We report the detection of 11 Rydberg bands of CO in FUSE spectra of the sight line toward HD 203374A. Eight of these electronic bands are seen in the interstellar medium for the first time. Our simultaneous fit of five non-Rydberg A-X bands together with the strongest Rydberg band of CO, C-X (0-0), yields a four-component cloud structure toward t…
QU Car: a very high luminosity nova-like binary with a carbon-enriched companion
Long, Knox S.; Drew, Janet E.; Hartley, Louise E. +1 more
QU Car is listed in cataclysmic variable star catalogues as a nova-like variable. This little-studied, yet bright interacting binary is re-appraised here in the light of new high-quality ultraviolet interstellar line data obtained with STIS on-board the Hubble Space Telescope. The detection of a component of interstellar absorption at a mean local…
On the location and composition of the dust in the MCG-6-30-15 warm absorber
Ballantyne, D. R.; Murray, N.; Weingartner, J. C.
The warm absorber observed in the Seyfert 1 galaxy MCG-6-30-15 is known to consist of at least two zones and very likely contains dust. Hubble Space Telescope images of MCG-6-30-15 show a dust lane crossing the galaxy just below the nucleus. In this paper, we argue that this dust lane is responsible for the observed reddening of the nuclear emissi…
Vesta's UV lightcurve: hemispheric variation in brightness and spectral reversal
Vilas, Faith; Hendrix, Amanda R.; Festou, Michel C.
Spectra of asteroid 4 Vesta obtained in October 1990 with the International Ultraviolet Explorer are reanalyzed and reinterpreted. A large portion of the eastern hemisphere (based on the prime meridian definition of Thomas et al., 1997a) is darker at UV wavelengths than much of the western hemisphere. The UV lightcurve is in contrast with the visi…
XMM observation of the dynamically young galaxy cluster CL 0939+4713
Schindler, S.; Castillo-Morales, A.; De Filippis, E.
We present an XMM observation of the distant galaxy cluster CL 0939+4713. The X-ray image shows pronounced substructure, with two main subclusters which have even some internal structure. This is an indication that the cluster is a dynamically young system. This conclusion is supported by the temperature distribution: a hot region is found between…
GRB 021125: The first GRB imaged by INTEGRAL
Götz, D.; Goldoni, P.; Mereghetti, S. +12 more
In the late afternoon of November 25th, 2002 a gamma-ray burst (GRB) was detected in the partially coded field of view (about 7.3deg from the centre) of the imager IBIS on board the INTEGRAL satellite. The instruments on-board INTEGRAL allowed, for the first time, the observation of the prompt gamma-ray emission over a broad energy band…
The Morphological Decomposition of Abell 868
Phillipps, S.; Driver, S. P.; Odewahn, S. C. +4 more
We report on the morphological luminosity functions (LFs) and radial profiles derived for the galaxy population within the rich cluster Abell 868 (z=0.153) based purely on Hubble Space Telescope imaging in F606W. We recover Schechter functions (-24.0<MF606W-5logh0.65<-16.0) within a 0.65h0.65 Mpc radius for e…
An XMM-Newton observation of the very young open cluster NGC 6383
Gosset, E.; Rauw, G.; De Becker, M. +2 more
We report the detection of a number of X-ray sources associated with the very young open cluster NGC 6383. About two thirds of these objects are correlated with a rather faint optical source and all but one have at least one infrared counterpart within a correlation radius of 8 arcsec. Although NGC 6383 is not associated with a prominent star form…
Calcium Abundance in the Solar Wind
Wurz, P.; Bochsler, P.; Ipavich, F. M. +1 more
We report on the calcium abundance in the solar wind for an extended time period around the 1996 solar minimum. Data were recorded with the Mass Time-of-Flight (MTOF) sensor of the Charge, Element, and Isotope Analysis System (CELIAS) instrument on the SOHO spacecraft. The Ca/O abundance is 0.017+/-0.003 for slow solar wind (VSW<400 …