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First INTEGRAL observations of eight persistent neutron star low mass X-ray binaries
Frontera, F.; Goldoni, P.; Santangelo, A. +16 more
Early results from the INTEGRAL Core Program, for a sample of eight persistently bright neutron star low mass X-ray binaries in the energy range from 5 keV to 200 keV, are presented. It is shown that INTEGRAL efficiently detects sources and that spectra may be obtained up to several hundreds of keV by combining data from three of the four INTEGRAL…
LBQS 1429-0053: A binary quasar rather than a lensed quasar.
Kneib, J. -P.; Faure, C.; Alloin, D. +3 more
Very deep ESO/VLT FORS1 and ISAAC images, as well as HST NICMOS2 data are used to infer the nature of the quasar pair LBQS 1429-0053 A and B, either a binary quasar or a doubly-imaged lensed quasar. Direct search of a putative lensing galaxy is unsuccessful down to R=27, J=24, Ks=22.5 and H=22.5. Moreover, no galaxy overdensity close to the quasar…
Comparison of Total Solar Irradiance with NASA/National Solar Observatory Spectromagnetograph Data in Solar Cycles 22 and 23
Jones, Patricia B.; Jones, Harrison P.; Branston, Detrick D. +1 more
NASA/National Solar Observatory Spectromagnetograph (SPM) data are compared with spacecraft measurements of total solar irradiance (TSI) variations for 8 yr beginning with the declining phase of solar cycle 22 and extending into the maximum of cycle 23. Previously reported conclusions based on a similar comparison for a shorter time period appear …
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