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ISOCAM in flight.
Altieri, B.; Aussel, H.; Elbaz, D. +63 more
ISOCAM, the camera on-board ISO, takes images of the sky in the wavelength range 2.5 to 18µm. It features two independent channels, containing each a 32x32 pixel detector: the short wavelength channel, 2.5 to 5.5µm, and the long wavelength channel, 4 to 18µm. Each channel features 10 or 11 discrete band pass filters and CVFs with…
The ISO Long-Wavelength Spectrometer.
Omont, A.; Ade, P. A. R.; Liseau, R. +60 more
The Long-Wavelength Spectrometer (LWS) is one of two complementary spectrometers aboard the European Space Agency's Infrared Space Observatory (ISO) (Kessler et al., 1996A&A...315L..49D). It operates over the wavelength range 43-196.9µm at either medium (about 150 to 200) or high (6800 to 9700) spectral resolving power. This Letter descr…
Mineralogy of oxygen-rich dust shells.
Lutz, D.; Genzel, R.; Heras, A. M. +34 more
Spectra taken with the Short Wavelength Spectrometer on board of the Infrared Space Observatory of dust shells around evolved oxygen-rich stars reveal the presence of several emission features at wavelengths between 20 and 45µm. These features have a range of widths and strengths, but are all narrow compared to the well-known amorphous silic…
SWS observations of the Galactic center.
Lutz, D.; Genzel, R.; Sturm, E. +11 more
We present a 2.4-45µm spectrum of the center of our Galaxy obtained with the Short Wavelength Spectrometer (SWS) on board ISO. The wide range of ionic fine structure lines observed yields an average effective temperature for the ionizing stars of 35000K, with a small contribution of significantly hotter stars, consistent with ageing of an ac…
First ISOCAM images of the Milky Way.
Elbaz, D.; Prusti, T.; Cesarsky, C. +21 more
ISOGAL is a 15µm ISOCAM survey of ~12deg^2^ in the Galactic Plane interior to |l|=45°. In combination with IJK data from the near-infrared southern sky survey DENIS, the ISO images allow the first detailed study of stellar populations throughout the inner Galaxy. We present preliminary results from a test observation at l= -45° with 6" pixel…
SWS observations of young main-sequence stars with dusty circumstellar disks.
Heras, A. M.; Waters, L. B. F. M.; Beintema, D. A. +18 more
We present SWS full-scan observations of three objects that are thought to be in a stage of evolution between the youngest, embedded, Herbig Ae/Be stars and Beta Pictoris, a young main-sequence star with a circumstellar disk. The 8-12µm spectra of all three stars cannot be understood in terms of purely amorphous silicates, but require the pr…
X-ray properties of active galactic nuclei with optical FeII emission.
Wang, T.; Brinkmann, W.; Bergeron, J.
ROSAT spectra of 86 Active Galactic Nuclei (AGN) with a broad range of optical FeII strengths have been analyzed. The results of the spectral analysis have been combined with optical and radio data as well as with optical emission line properties collected from the literature to understand the origin of the strong FeII emission and the nature of t…
An ISO SWS view of interstellar ices: first results.
Prusti, T.; de Graauw, T.; van Dishoeck, E. F. +7 more
The availability of SWS data from the Infrared Space Observatory is a landmark in the study of interstellar ices. This paper presents a brief review of what was known prior to the launch of ISO, and attempts a synthesis of what has been learned from the ISO observations available to date. Key areas of uncertainty are identified to provide a basis …
SWS spectroscopy of small grain features across the M17-Southwest photodissociation front.
Falgarone, E.; Wright, C. M.; Drapatz, S. +3 more
We present SWS spectra taken across the M17-Southwest photodissociation front and discuss spectral properties of PAHs and VSGs. We report new features at 4.65, 6.35, 8.7 and 11µm which we interpret as PAHs and/or VSGs emission. From feature intensity ratios along the cut, we find PAHs are mainly ionized and almost fully hydrogenated.
Spectrophotometry of UIR bands in the diffuse emission of the galactic disk.
Lemke, D.; Laureijs, R. J.; Lehtinen, K. +5 more
The spectrum of the unidentified infrared (UIR) emission bands between 5.8 and 11.6µm has been observed for the first time for the diffuse emission of the galactic disk where the interstellar radiation field (ISRF) is quite low. The UIR bands at 6.2, 7.7, 8.6, and 11.3µm have absolute intensities which are ~1/10th of the values observe…