Search Publications
Structure and physical properties of the rapidly evolving dusty envelope of IRC +10 216 reconstructed by detailed two-dimensional radiative transfer modeling
Weigelt, G.; Men'shchikov, A. B.; Balega, Y. +2 more
We present the first detailed, two-dimensional radiative transfer model of the dusty envelope around the carbon star
Mid-infrared imaging and spectroscopy of the enigmatic cocoon stars in the Quintuplet Cluster
Blommaert, J. A. D. L.; Moneti, A.; Najarro, F. +2 more
In an attempt to determine the nature of the enigmatic cocoon stars in the Quintuplet Cluster, we have obtained mid-infrared imaging and spectrophotometry of the cluster, using the CAM and SWS instruments on ISO, using SpectroCam-10 on the Palomar 5 m telescope, and NICMOS on HST. The spectra show smooth continua with various dust and ice absorpti…
Infrared optical properties of spinels. A study of the carrier of the 13, 17 and 32 mu m emission features observed in ISO-SWS spectra of oxygen-rich AGB stars
Mutschke, H.; Posch, Th.; Kerschbaum, F. +2 more
In a previous paper, we have proposed magnesium aluminium spinel to be the carrier of the 13 and 17 mu m band features observed in the ISO spectra of some red giants. The IR optical properties of spinel strongly depend on its chemistry and its internal structure. To study the dependence of spinel's IR-spectra on its aluminium content, we have synt…
Infrared dark clouds from the ISOGAL survey. Constraints on the interstellar extinction curve
Ganesh, S.; Teyssier, D.; Pérault, M. +1 more
The ISO galactic survey provides images of the inner disk in two broad filters (around 7 and 15 mu m) over some 15 square degrees, away from the brightest star forming regions. A multiresolution analysis of the images leads to a catalogue of infrared dark clouds, most of which are condensed cores of large molecular clouds, several kpc away from th…
An XMM-Newton study of the X-ray binary MXB 1659-298 and the discovery of narrow X-ray absorption lines
Parmar, A. N.; Sidoli, L.; Oosterbroek, T. +2 more
We report the discovery of narrow X-ray absorption lines from the low-mass X-ray binary MXB 1659-298 during an XMM-Newton observation in 2001 February. The 7.1 hr orbital cycle is clearly evident with narrow X-ray eclipses preceded by intense dipping activity. A sinusoid-like OM B-band modulation with a peak-to-peak modulation of ~ 0.5 mag and a m…
Mid-Infrared observations of NGC 1068 with the Infrared Space Observatory
Le Floc'h, E.; Cesarsky, C.; Sauvage, M. +5 more
We report on Mid-Infrared (MIR) observations of the Seyfert 2 galaxy NGC 1068, obtained with ISOCAM in low-resolution spectro-imaging mode. The spatial resolution ( ~ 5 arcsec) allows us to disentangle the circumnuclear starburst regions from the emission of the active galactic nucleus (AGN). The global spatial distribution of the Unidentified Inf…
A mosaic of the Coma cluster of galaxies with XMM-Newton
Aghanim, N.; Arnaud, M.; Vestrand, W. T. +7 more
The
An XMM-Newton study of the sub-structure in M 87's halo
Böhringer, H.; Molendi, S.; Ehle, M. +9 more
The high signal to noise and good point spread function of XMM have allowed the first detailed study of the interaction between the thermal and radio emitting plasma in the central regions of M 87. We show that the X-ray emitting structure, previously seen by ROSAT, is thermal in nature and that the east and southwest extensions in M 87's X-ray ha…
Dust emission from 3C radio galaxies and quasars: New ISO observations favour the unified scheme
Meisenheimer, K.; Lemke, D.; Klaas, U. +3 more
In order to test the unified scheme for luminous radio galaxies and quasars we observed 10 galaxy/quasar pairs from the 3CR catalogue with ISOPHOT at infrared wavelengths between 5 and 180 mu m. Each pair was selected such that both the 178 MHz luminosity and the redshift match as close as possible between the radio galaxy and the quasar in order …
A search for the cause of cyclical wind variability in O stars. Simultaneous UV and optical observations including magnetic field measurements of the O7.5III star xi Persei
Kaper, L.; Bohlender, D. A.; Gordon, K. +13 more
We present the results of an extensive observing campaign on the O7.5 III star