Search Publications
What Powers Ultraluminous IRAS Galaxies?
Lutz, D.; Genzel, R.; Sturm, E. +9 more
We present an ISO SWS and ISOPHOT-S, mid-infrared spectroscopic survey of 15 ultraluminous IRAS galaxies (LIR >= 1012 L⊙). We combine the survey results with a detailed case study, based on arcsecond resolution, near-IR, and millimeter imaging spectroscopy, of one of the sample galaxies (UGC 5101). We compare th…
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 Nature and Evolution of Ultraluminous Infrared Galaxies:A Mid-Infrared Spectroscopic Survey
Lutz, D.; Genzel, R.; Rigopoulou, D. +2 more
We report the first results of a low-resolution mid-infrared spectroscopic survey of an unbiased, far-infrared-selected sample of 60 ultraluminous infrared galaxies (ULIRGs) (LIR>1012 Lsolar) using ISOPHOT-S on board the Infrared Space Observatory (ISO). We use the ratio of the 7.7 µm ``polycyclic aromatic…
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…
Infrared Space Observatory Measurements of a [C II] 158 Micron Line Deficit in Ultraluminous Infrared Galaxies
Wolfire, M. G.; Lord, S. D.; Stacey, G. J. +6 more
We report measurements of the [C II] 157.74 µm fine-structure line in a sample of seven ultraluminous infrared galaxies (ULIGs) (LIR>1012 Lsolar) with the Long Wavelength Spectrometer on the Infrared Space Observatory. The [C II] line is an important coolant in galaxies and arises in interstellar gas expos…
Detection of Abundant CO2 Ice in the Quiescent Dark Cloud Medium toward Elias 16
de Graauw, Th.; Prusti, T.; van Dishoeck, E. F. +9 more
We report the first detection of solid carbon dioxide (CO2) in quiescent regions of a dark cloud in the solar neighborhood, a result that has important implications for models of ice formation and evolution in the interstellar medium. The K-type field star Elias 16 was previously known to display solid-state absorption features of H
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…