J . G . A . Wouterloot

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Context. The determination of interstellar abundances is essential for a better understanding of stellar nucleosynthesis and the “chemical” evolution of the Galaxy. Aims. The aim is to determine O/O abundance ratios across the entire Galaxy. These provide a measure of the amount of enrichment by high-mass versus intermediate-mass stars. Methods. Such(More)
We present results from an initial survey of the 2(12)-1(11) transition of formaldehyde (H2CO) at 140.8 GHz in giant molecular clouds in the far outer Galaxy (RG >or= 16 kpc). Formaldehyde is a key prebiotic molecule that likely plays an important role in the development of amino acids. Determining the outermost extent of the H2CO distribution can constrain(More)
— We have investigated the C/C abundance ratio in the far-outer Galaxy. We have used the IRAM 30-m telescope to obtain the CO and CO(1−0) and (2−1) distributions towards five IRAS sources at about 16−17 kpc from the galactic center. CO(1−0) and (2−1) were observed towards the CO peak positions in those clouds. The source with the strongest CO emission, WB(More)
Lynds 1340, a molecular cloud forming intermediate-mass stars, has been mapped in the NH3(1,1) and (2,2) transitions with the Effelsberg 100-m telescope. We observed the whole area of the cloud where CO emission was detected earlier, at a 40′′ grid, with additional positions towards the CO peaks and optically invisible IRAS point sources. Our observations(More)
Clumpy outer Galaxy molecular clouds and the steepening of the IMF J. Brand 1 J.G.A. Wouterloot 1,2,3 Present address: Joint Astronomy Centre, 660 N. A’ohoku Place, University Park, 96720 Hilo, Hawaii, USA A.L. Rudolph 4 NSF Career Fellow E.J. de Geus 5,6 Present address: NFRA, Postbus 2, 7990 AA Dwingeloo, The Netherlands J. Brand (brand@ira.bo.cnr.it)(More)
Context. To investigate the earliest phases of star formation and study how newly-born stars interact with the surrounding medium, we performed a line and continuum survey at NIR and mm-wavelengths of a sample of relatively isolated Bok globules. Aims. We present a follow-up observational program of a star-forming site in the globule CB230. From narrow-band(More)
Stars form in the densest, coldest, most quiescent regions of molecular clouds. Molecules provide the only probes which 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)
Aims. We aim to study dust properties of massive star forming regions in the outer Galaxy, in a direction opposite to the Galactic center. Methods. We present observations of six outer Galaxy point sources IRAS 01045+6505, 01420+6401, 05271+3059, 05345+3556, 20222+3541 and 20406+4555, taken with the Submillimeter Common-User Bolometer Array (SCUBA) on the(More)
We present [C i] P1– P0 spectra at four spiral arm positions and the nuclei of the nearby galaxies M83 and M51 obtained at the JCMT. The spiral arm positions lie at galacto-centric distances of between 2 kpc and 6 kpc. This data is complemented with maps of CO 1–0, 2–1, and 3–2, and ISO/LWS far-infrared data of [C ii] (158μm), [O i] (63μm), and [N ii](More)