Emmanuel Caux

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Iso-Lws mapping observations of the Serpens molecular cloud core are presented. The spectral range is 50 − 200μm and the map size is 8′ × 8′. These observations suffer from severe source confusion at Fir wavelengths and we employ a Maximum Likelihood Method for the spectrospatial deconvolution. The strong and fairly isolated source SMM 1/FIRS 1 presented a(More)
Using the Long Wavelength Specrometer aboard ISO, we have detected far infrared rotational H2O emission lines in five low-mass young stellar objects in a survey of seven such sources. The total H2O fluxes are well correlated with the 1.3 mm continuum fluxes, but – surprisingly – not with the SiO millimeter emission originating in the outflows, suggesting(More)
Low-mass protostars form from condensations inside molecular clouds when gravity overwhelms thermal and magnetic supporting forces. The first phases of the formation of a solartype star are characterized by dramatic changes not only in the physical structure but also in the chemical composition. Since Protostars and Planets IV (e.g., Langer et al., 2000),(More)
We report observations of the expected main S-bearing species (SO, SO2 and H2S) in the low-mass star forming region L1689N. We obtained large scale (∼ 300′′x200′′) maps of several transitions from these molecules with the goal to study the sulphur chemistry, i.e. how the relative abundances change in the different physical conditions found in L1689N. We(More)
Stars form in the densest, coldest, most quiescent regions of molecular clouds. Molecules provide the only probes that can reveal the dynamics, physics, chemistry, and evolution of these regions, but our understanding of the molecular inventory of sources and how this is related to their physical state and evolution is rudimentary and incomplete. The(More)
The wavelength and flux calibration, and the inorbit performance of the Infrared Space Observatory LongWavelength Spectrometer (LWS) are described. The LWS calibration is mostly complete and the instrument’s performance in orbit is largely as expected before launch. The effects of ionising radiation on the detectors, and the techniques used to minimise them(More)
We present ISO-LWS high spectral resolution (R ∼ 104) observations of the [OI] 63 μm and 145 μm lines towards the high mass star formation region W49N. At 145 μm the observed spectrum shows an emission component only, while at 63 μm it shows both emission and absorption components. We performed an analysis of the observed spectra using measured profiles of(More)
We report mid-IR wavelength observations toward the low mass star forming region IRAS 16293-2422 between 45μm 197μmwith the LongWavelength Spectrometer (LWS) on board ISO, and of the CI(609μm) line observed with the JCMT. A map of the CII(157μm) line shows that the region is relatively uncontaminated by Photo-Dissociation Region-like emission; there is only(More)
We present spectroscopic ISO-LWS observations of the [OI] (63 μm and 145 μm), the [CII] (158 μm) and the H2O (179 μm) lines towards the molecular cloud L1689N. From the observed ratio of the two [OI] lines, we deduce a mean gas temperature of (26 ±0.5) K, an H2 density ≥ 3 × 104 cm−3 and an [OI] column density ≥ 5 × 1019 cm−2. Combining these observations(More)
This paper describes the Heterodyne Instrument for the Far-Infrared (HIFI), to be launched onboard of ESA's Herschel Space Observatory, by 2008. It includes the first results from the instrument level tests. The instrument is designed to be electronically tuneable over a wide and continuous frequency range in the Far Infrared, with velocity resolutions(More)