Search Publications
Source counts from the 15 mu m ISOCAM Deep Surveys
Aussel, H.; Elbaz, D.; Clements, D. L. +11 more
We present the results of the five mid-IR 15 mu m (12-18 mu m LW3 band) ISOCAM Guaranteed Time Extragalactic Surveys performed in the regions of the Lockman Hole and Marano Field. The roughly 1000 sources detected, 600 of which have a flux above the 80% completeness limit, guarantee a very high statistical significance for the integral and differe…
ISOCAM observations of the Hubble Deep Field reduced with the PRETI method
Aussel, H.; Elbaz, D.; Cesarsky, C. J. +1 more
We have developed a new ISOCAM data reduction technique based on wavelet analysis, especially designed for the detection of faint sources in mid-infrared surveys. This method, the Pattern REcognition Technique for Isocam data (PRETI) has been used to reduce the observations of the Hubble Deep Field (HDF) and flanking fields with ISOCAM at 6.75 (LW…
Mass-loss rates and luminosity functions of dust-enshrouded AGB stars and red supergiants in the LMC
Waters, L. B. F. M.; van Loon, J. Th.; Loup, C. +5 more
A radiative transfer code is used to model the spectral energy distributions of 57 mass-losing Asymptotic Giant Branch (AGB) stars and red supergiants (RSGs) in the Large Magellanic Cloud (LMC) for which ISO spectroscopic and photometric data are available. As a result we derive mass-loss rates and bolometric luminosities. A gap in the luminosity …
Weak ice absorption features at 7.24 and 7.41 MU M in the spectrum of the obscured young stellar object W 33A
de Graauw, Th.; van Dishoeck, E. F.; Whittet, D. C. B. +7 more
ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.41 mu m. Comparison to interstellar ice analogs shows that the 7.24 mu m band can be well matched by the CH deformation mode of formic acid (HCOOH), while the 7.41 mu m band can be fitted both by the formate ion (HCOO(…
FIRBACK. I. A deep survey at 175 microns with ISO, preliminary results
Aussel, H.; Elbaz, D.; Cesarsky, C. +10 more
FIRBACK is a deep survey conducted with the ISOPHOT instrument aboard the Infrared Space Observatory (ISO) at an effective wavelength of 175 mu m. We present here results we have obtained on the first field, the so-called Marano1 which covers around 0.25 square degree. We find that the source density for objects with a flux above 200 mJy exceeds t…
2.4-197 mu m spectroscopy of OH/IR stars: the IR characteristics of circumstellar dust in O-rich environments
Waters, L. B. F. M.; Omont, A.; Barlow, M. J. +4 more
Infrared spectra of a number of evolved O-rich stars have been obtained with the Short- and Long- Wavelength spectrometers on board the Infrared Space Observatory. The very broad wavelength coverage (2.4-197 mu m) obtained by combining observations made with the two spectrometers includes practically all of the flux emitted by the sources, and all…
An ultra-deep ISOCAM observation through a cluster-lens
Altieri, B.; Aussel, H.; Elbaz, D. +10 more
We present results of ultra-deep ISOCAM observations through a cluster-lens at 7mu m and 15mu m with the Infrared Space Observatory (ISO) satellite. These observations reveal a large number of luminous Mid-Infrared (MIR) sources. Cross-identification in the optical and Near-Infrared (NIR) wavebands shows that about half of the 7 mu m sources are c…
The ISO spectrum of the young star HD 142527
Waters, L. B. F. M.; de Koter, A.; Waelkens, C. +2 more
We present a detailed analysis of SWS (2.35-45 mu m) and LWS (43-200 mu m) spectra obtained with the Infrared Space Observatory (ISO) (Kessler et al. 1996) of the dusty circumstellar disk surrounding the isolated young Fe star HD 142527. Two dust populations can be clearly discriminated: a warm component which is dominated by very strong silicate …
Laboratory studies of thermally processed H_2O-CH_3OH-CO_2 ice mixtures and their astrophysical implications
van Dishoeck, E. F.; Whittet, D. C. B.; Schutte, W. A. +7 more
Data of the Infrared Space Observatory ISO have strongly influenced the current view of interstellar ice chemistry. ISO and ground-based results have confirmed that the most abundant ice species in warm regions close to massive protostars are H_2O, CO_2, and CH_3OH. Ice segregation in those environments reflects the extensive thermal processing of…
On the origin of the 13 mu m feature. A study of ISO-SWS spectra of oxygen-rich AGB stars
Mutschke, H.; Hron, J.; Kerschbaum, F. +3 more
We have derived a mean profile of the 13 mu m emission feature from 11 ISO spectra of oxygen-rich AGB stars and present an overview of the mineral species that could account for it. Our results can be summarized as follows: i) Spherical particles of alpha -Al_2O_3 (corundum) have a sharp emissivity maximum peaking at 12.7 mu m. The difference of 0…