Search Publications
XMM-Newton high-resolution X-ray spectroscopy of the Wolf-Rayet object WR 25 in the Carina OB1 association
Schmutz, W.; Raassen, A. J. J.; Mewe, R. +5 more
We report the analysis of the first high-resolution X-ray spectra of the Wolf-Rayet (WR) object WR 25 (HD 93162, WN6ha+O4f) obtained with the Reflection Grating Spectrometers (RGS) and the European Photon Imaging Cameras (EPIC-MOS and PN) CCD spectrometers on board the XMM-Newton satellite. The spectrum exhibits bright emission lines of the H- and…
ISO-SWS calibration and the accurate modelling of cool-star atmospheres. IV. G9 to M2 stars
Eriksson, K.; Gustafsson, B.; Decin, L. +5 more
A detailed spectroscopic study of 11 giants with spectral type from G9 to M2 is presented. The 2.38-4.08 mu m wavelength-range of band 1 of ISO-SWS (Short-Wavelength Spectrometers on board of the Infrared Space Observatory) in which many different molecules - with their own dependence on each of the stellar parameters - are absorbing, enables us t…
How many Hipparcos Variability-Induced Movers are genuine binaries?
Makarov, V. V.; Jorissen, A.; Pourbaix, D. +3 more
Hipparcos observations of some variable stars, and especially of long-period (e.g. Mira) variables, reveal a motion of the photocenter correlated with the brightness variation (variability-induced mover - VIM), suggesting the presence of a binary companion. A re-analysis of the Hipparcos photometric and astrometric data does not confirm the VIM so…
An XMM-Newton study of the hard X-ray sky
Cappi, M.; Piconcelli, E.; Dadina, M. +2 more
We report on the spectral properties of a sample of 90 hard X-ray selected serendipitous sources detected in 12 XMM-Newton observations with 1 <≈F2-10simlt 80 x 10-14 erg cm-2 s-1. Approximately 40% of the sources are optically identified with 0.1 <~ z<~ 2 and most of them are classified as broa…
Detection of molecular hydrogen at z = 1.15 toward HE 0515-4414
Reimers, D.; Baade, R.; Levshakov, S. A. +1 more
A new molecular hydrogen cloud is found in the sub-damped Lyalpha absorber [log N(H I) = 19.88+/-0.05] at the redshift zabs = 1.15 toward the bright quasar HE 0515-4414 (zem = 1.71). More than 30 absorption features in the Lyman band system of H2 are identified in the UV spectrum of this quasar obtained with the Sp…
Simultaneous observations of the quasar 3C 273 with INTEGRAL and RXTE
Grindlay, J. E.; Walter, R.; Lund, N. +15 more
INTEGRAL has observed the bright quasar 3C 273 on 3 epochs in January 2003 as one of the first observations of the open programme. The observation on January 5 was simultaneous with RXTE and XMM-Newton observations. We present here a first analysis of the continuum emission as observed by these 3 satellites in the band from =~ 3 keV to =~ 500 keV.…
XMM-Newton observations of High Mass X-ray Binaries in the SMC
Pietsch, W.; Haberl, F.; Sasaki, M.
Based on XMM-Newton EPIC data of four pointings towards the Small Magellanic Cloud (SMC), results on timing and spectral analyses of 16 known high mass X-ray binaries (HMXBs) and HMXB candidates in the SMC are presented. We confirm the pulse periods of four sources which were known to show pulsations. In addition, two new X-ray pulsars are discove…
Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster
van Loon, J. Th.; Eyres, S. P. S.; Evans, A. +3 more
Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instrument ISOPHOT at 60 µm, 70 µm and 90 µm has detected the thermal emission from dust in its core, the first secure detection of intra-cluster dust in a globular cluster. The amount of dust is broadly consistent with mass…
An XMM-Newton view of the extended ``filament'' near the cluster of galaxies Abell 85
Churazov, E.; Forman, W.; Durret, F. +1 more
We have observed with XMM-Newton the extended 4 Mpc filament detected by the ROSAT PSPC in the neighbourhood of the cluster of galaxies Abell 85. We confirm that there is an extended feature, aligned at the same position angle as the major axis of the central cD, the bright cluster galaxies, and nearby groups and clusters. We find that the X-ray e…
Galactic structure studies with BATC star counts
Zhou, Xu; Ma, Jun; Jiang, Zhaoji +6 more
We report the first results of star counts carried out with the National Astronomical Observatories (NAOC) 60/90 cm Schmidt Telescope in 15 intermediate-band filters from 3000 to 10 000 Å in the BATC survey. We analyze a sample of over 1400 main sequence stars (14<=Vle21 ), which lie in the field with central coordinates RA=09h53