Search Publications
A long-wavelength view on galaxy evolution from deep surveys by the Infrared Space Observatory
Aussel, H.; Elbaz, D.; Franceschini, A. +2 more
We discuss the constraints set on galaxy evolution by a variety of data from deep extragalactic surveys performed in the mid-IR and far-IR with the Infrared Space Observatory and with millimetric telescopes at longer wavelengths. These observations indicate extremely high rates of evolution for IR galaxies, exceeding those measured for galaxies at…
The deuterium abundance in Jupiter and Saturn from ISO-SWS observations
Lellouch, E.; Encrenaz, T.; de Graauw, T. +3 more
Observations with the Short Wavelength Spectrometer (SWS) onboard the Infrared Space Observatory (ISO) are used to determine the D/H ratio in Jupiter's and Saturn's atmospheres. The D/H ratio is measured independently in hydrogen (i.e. from the HD/H2 ratio) and methane (from CH3D/CH4). Observations of the HD R(2) a…
Order and chaos in the local disc stellar kinematics induced by the Galactic bar
Fux, R.
The Galactic bar causes a characteristic splitting of the disc phase space into regular and chaotic orbit regions which is shown to play an important role in shaping the stellar velocity distribution in the Solar neighbourhood. A detailed orbital analysis within an analytical 2D rotating barred potential reveals that this splitting is mainly dicta…
High resolution X-ray spectroscopy of zeta Puppis with the XMM-Newton reflection grating spectrometer
Mewe, R.; Güdel, M.; Leutenegger, M. A. +5 more
We present the first high resolution X-ray spectrum of the bright O4Ief supergiant star zeta Puppis, obtained with the Reflection Grating Spectrometer on-board XMM-Newton. The spectrum exhibits bright emission lines of hydrogen-like and helium-like ions of nitrogen, oxygen, neon, magnesium, and silicon, as well as neon-like ions of iron. The lines…
Complex resonance absorption structure in the X-ray spectrum of IRAS 13349+2438
Kaastra, J. S.; Clavel, J.; Behar, E. +8 more
The luminous infrared-loud quasar
XMM-Newton observations of M 87 and its X-ray halo
Böhringer, H.; Dos Santos, S.; Guainazzi, M. +10 more
We report performance verification observations of the giant elliptical galaxy M 87 in the Virgo Cluster with the MOS, pn, and optical monitor instruments on board of XMM-Newton. With the energy sensitive imaging instruments MOS and pn we obtain the first spatially constrained X-ray spectra of the nucleus and the jet of the galaxy. The good photon…
First light measurements with the XMM-Newton reflection grating spectrometers: Evidence for an inverse first ionisation potential effect and anomalous Ne abundance in the Coronae of HR 1099
Kaastra, J. S.; Mewe, R.; Audard, M. +15 more
The RS CVn binary system HR 1099 was extensively observed by the XMM-Newton observatory in February 2000 as its first-light target. A total of 570 ks of exposure time was accumulated with the Reflection Grating Spectrometers (RGS). The integrated X-ray spectrum between 5-35 Å is of unprecedented quality and shows numerous features attributed to tr…
Incidence and survival of remnant disks around main-sequence stars
Kessler, M. F.; Siebenmorgen, R.; Bouchet, P. +8 more
We present photometric ISO 60 and 170 µm measurements, complemented by some IRAS data at 60 µm, of a sample of 84 nearby main-sequence stars of spectral class A, F, G and K in order to determine the incidence of dust disks around such main-sequence stars. Fifty stars were detected at 60 µm. 36 of these emit a flux expected from t…
Infrared to millimetre photometry of ultra-luminous IR galaxies: New evidence favouring a 3-stage dust model
Lemke, D.; Schulz, B.; Klaas, U. +7 more
Infrared to millimetre spectral energy distributions (SEDs) have been obtained for 41 bright ultra-luminous infrared galaxies (ULIRGs). The observations were carried out with ISOPHOT between 10 and 200 mu m and supplemented for 16 sources with JCMT/SCUBA at 450 and 850 mu m and with SEST at 1.3 mm. In addition, seven sources were observed at 1.2 a…
A Hipparcos study of the Hyades open cluster. Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
de Bruijne, J. H. J.; de Zeeuw, P. T.; Hoogerwerf, R.
Hipparcos parallaxes fix distances to individual stars in the Hyades cluster with an accuracy of ~ 6 percent. We use the Hipparcos proper motions, which have a larger relative precision than the trigonometric parallaxes, to derive ~ 3 times more precise distance estimates, by assuming that all members share the same space motion. An investigation …