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Steps toward interstellar silicate mineralogy. IV. The crystalline revolution
Waters, L. B. F. M.; Mutschke, H.; Henning, Th. +3 more
Mid- and far-infrared spectra gained by the Short Wavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO) satellite have provided striking evidence for the presence of crystalline silicates in comets, circumstellar envelopes around young stars and, most of all, evolved stars and planetary nebulae. Since optical properties of astrophy…
The spectrum of the young star HD 100546 observed with the Infrared Space Observatory
Waters, L. B. F. M.; Vandenbussche, B.; Waelkens, C. +3 more
It is generally assumed that planets form in the dusty disks that surround young stars (Beckwith & Sargent 1996). The Infrared Space Observatory (Kessler et al. 1996) now enables us to determine the characteristics of these disks with unprecedented spectral resolution and signal-to-noise. We present here ISO spectra of the disk that surrounds …
The dark side of star formation in the Antennae galaxies
Cesarsky, C.; Duc, P. -A.; Madden, S. C. +6 more
We compare mid-infrared images of the Antennae galaxies (NGC4038/39) from the Infrared Space Observatory, with optical images from the Hubble Space Telescope. The mid-infrared observations show that the most intense starburst in this colliding system of galaxies takes place in an off-nucleus region that is inconspicuous at optical wavelengths. The…
Crystalline silicates in planetary nebulae with [WC] central stars
de Graauw, Th.; Waters, L. B. F. M.; Pottasch, S. R. +6 more
We present ISO-SWS spectroscopy of the cool dusty envelopes surrounding two Planetary Nebulae with [WC] central stars, BD+30 3639 and He 2-113. The lambda < 15 mu m region is dominated by a rising continuum with prominent emission from C-rich dust (PAHs), while the long wavelength part shows narrow solid state features from crystalline silicate…
Asteroids as far-infrared photometric standards for ISOPHOT
Mueller, T. G.; Lagerros, J. S. V.
Asteroids are used as far-IR calibrators for the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory ISO. For the 10 selected objects we compiled a large uniform database of 678 individual observations, ranging from 7-2 000 microns. Applying a new thermophysical model to the observations we derived thermal properties of the se…
Evidence for water vapor in Titan's atmosphere from ISO/SWS data
de Graauw, Th.; Kessler, M. F.; Lellouch, E. +6 more
The infrared spectrum of Titan around 40 mu m was recorded in the grating mode of the Short Wavelength Spectrometer (SWS) of ISO, with a resolving power of about 1900. Two emission features appear at 43.9 and 39.4 mu m, where pure rotational water lines are expected. Line strengths are about 8 times the 1sigma statistical noise level. The H_2O ver…
Laboratory identification of the 4.62mu M solid state absorption band in the ISO-SWS spectrum of RAFGL 7009S
Heras, A. M.; Dartois, E.; Demyk, K. +3 more
We focus on the problem of the assignment of the ``XCN'' solid state feature observed in the spectra of numerous protostellar objects. This feature, located at 4.62µm has been tentatively identified with the molecular ion OCN(-) . New laboratory experiments have been performed in order to confirm this identification. OCN(-) is produced by UV…
ISO deep far-infrared survey in the ``Lockman Hole''. A search for obscured objects at high redshift. I. Observations
Sanders, D. B.; Kawara, K.; Taniguchi, Y. +11 more
Two 44arcmin x 44arcmin fields in the Lockman Hole were mapped at 95 mu m and 175 mu m using ISOPHOT. A simple program code combined with PIA works well to correct for drift in the detector responsivity. The number density of 175 mu m sources is 3-10 times higher than expected from the no-evolution model. Based on observations with ISO, an ESA pro…
Resolved 200mu M images of nearby galaxies - evidence for an extended distribution of cold dust
Bianchi, S.; Gear, W.; Davies, J. I. +6 more
We present resolved 200mu m images for 8 nearby galaxies observed with the Infrared Space Observatory (ISO). By comparing the 200mu m observations with IRAS 60mu m and 100mu m data, we find that cold dust becomes more dominant at larger radii. We infer a grain temperature of 18-21 K for this cold component i.e. about 10 K lower than the warm dust …
The shape of the unidentified infra-red bands: analytical fit to ISOCAM spectra
Boulanger, F.; Cesarsky, D.; Ryter, C. +1 more
Modelling the unidentified infrared dust bands at 6.2 7.7, 8.6, 11.3, and 12.7 µm by Lorentz profiles is shown to produce excellent fits to the spectra obtained with the Continuous Variable Filter (CVF) of the instrument ISOCAM, on-board the Infrared Space Observatory (ISO). The feature pedestals are accounted for by the wide wings of the Lo…