Search Publications
The deuterium abundance in the z= 0.7 absorber towards QSO PG1718+4807
Webb, J. K.; Carswell, R. F.; Lanzetta, K. M. +1 more
We report on a further analysis of the ratio of deuterium to hydrogen (D/H) using Hubble Space Telescope (HST) spectra of the z= 0.701 Lyman limit system towards the quasi-stellar object (QSO) PG1718+481. Initial analyses of this absorber found it gave a high D/H value, 1.8-3.1 × 10-4, inconsistent with several higher redshift measureme…
On the sudden disappearances of solar filaments and their relationship with coronal mass ejections
Pojoga, S.; Huang, T. S.
Sudden disappearances of prominences/filaments were identified from the Prairie View Solar Observatory H α imagesand Meudon Observatory spectroheliograms for the period January 1, 2000 to March 31, 2000. Three classes of disappearances were considered for the purpose of this study: eruptive, quasi-eruptive and vanishing filaments. The H α events w…
Mid-infrared images of the star forming region GGD 14 (IRAS 06084-0611)
Persi, P.; Tapia, M.
Mid-infrared images at 8.7, 9.7 and 12.5 mu m are presented of the star forming region GGD 14 associated with the source IRAS 06084-0611. In an area of ~ 30arcsec around the IRAS position, two mid-infrared sources were found. One was identified with the cometary compact HII region VLA 1 and the second with the faint and unresolved radio continuum …
Relation of transition region blinkers to the low chromosphere
Peter, H.; Brković, A.
We investigated the coupling between the low chromosphere, lower and upper transition region through the study of blinkers. Blinkers are extreme ultraviolet (EUV) small-scale transient brightenings best detected in transition region lines showing an intensity enhancement on the 60-100% level on average. We analysed time-series spectra of the \cii …
HST and UKIRT imaging observations of z~ 1 6C radio galaxies - I. The data
Eales, S.; Rawlings, S.; Röttgering, H. J. A. +3 more
The results of Hubble Space Telescope and UKIRT imaging observations are presented for a sample of 11 6C radio galaxies with redshifts 0.85 < z < 1.5. The observations of the 6C sources reveal a variety of different features, similar to those observed around the higher power 3CR sources of similar redshifts. However, the extent and luminosit…
A triple nucleus in the brightest cluster galaxy in Abell 193
Seigar, Marc S.; Lynam, Paul D.; Chorney, Nicole E.
We present a ground-based, near-infrared, K-band image and a Hubble Space Telescope (HST) WFPC2 image of the brightest cluster galaxy in Abell 193 (IC 1695). This object was selected as the central cluster galaxy using X-ray information. Both images reveal a triple nucleus structure. Previously, this galaxy was thought to have only two nuclei. We …
RX J004717.4-251811: The first eclipsing X-ray binary outside the Local Group
Pietsch, W.; Haberl, F.; Vogler, A.
The X-ray source
Variability of EUV-spectra from the quiet upper solar atmosphere: Intensity and Doppler shift
Peter, H.; Solanki, S. K.; Brković, A.
We have studied SUMER and CDS time series of spectra and images of quiet-Sun regions at the solar disc centre. The data contain ultraviolet emission lines sampling temperatures of the chromosphere, transition region and corona. We find a high correlation between average net Doppler shifts and relative brightness variabilities of the studied lines …
X-ray spectroscopy of UZ Librae
Gondoin, P.
UZ Librae is the giant primary of a close binary system with extremely fast rotation and revolution. Its distinctive characteristics include an optical light curve with a large amplitude and a high X-ray luminosity. UZ Librae was observed twice at five months interval in August 2000 and January 2001 by the XMM-Newton space observatory. Serie of li…
Understanding the LMXB X2127+119 in M 15. II. The UV data
Margon, B.; Charles, P. A.; Ilovaisky, S. +4 more
We present HST UV observations of the high-inclination low mass X-ray binary AC211 (X2127+119), which is located in the globular cluster M 15 (NGC 7078). We have discovered a CIV P Cygni profile in this system, which confirms the existence of an outflow from AC211. The outflow velocity as measured from the P Cygni profile is =~ 1500 km s-1