Aims. Characterizing the gas and dust properties prior to and in the neighborhood of active intermediate-to high-mass star formation. Methods. Two Infrared Dark Clouds (IRDCs) – IRDC 19175-4 and IRDC 19175-5 – that are located in the vicinity of the luminous massive star-forming region IRAS 19175+1357, but that remain absorption features up to 70 µm wavelength, were observed with the Plateau de...

This work is devoted to the segmentation and tracking of structures undergoing large deformations in an image sequence. The overall goal is the modelling of complex moving and deforming structures that simultaneously brings compression of the data, segmentation and tracking of the structures on temporal sequences of images. Deforming structures are approximated by implicit templates, deened as ...

We use sensitive observations of three high-redshift sources: [C II] P3/2 → P1/2 finestructure and CO (J = 2 → 1) rotational transitions for the z = 6.4 quasar (QSO) host galaxy J1148+5251 taken with the Plateau de Bure Interferometer (PdBI) and Jansky Very Large Array, respectively, and [C II] and CO (J = 5 → 4) transitions from the QSO BR1202−0725 and its companion sub-millimetre galaxy (SMG)...

We analyse the spectral line energy distributions of 13CO and C18O for the J = 1→0 up to J = 7→6 transitions in the gravitationally lensed ultraluminous infrared galaxy SMM J2135−0102 at z = 2.3. This is the first detection of 13CO and C18O in a highredshift star-forming galaxy. These data comprise observations of six transitions taken with Plateau de Bure Interferometer and we combine these wi...

We report about high spatial resolution observations made with the IRAM Plateau de Bure interferometer of the 12CO(J = 1 → 0) emission from a 1.1 × 1.1 kpc plane-of-sky field on a spiral arm of Messier 81. With a beam of 5′′ ≈ 90 pc, we identify 6 giant molecular cloud complexes with virial masses of ≈ 106 M , including one associated with a giant HII region. The deduced N (H2)/ICO ratios are a...

Aims. Our aim is to unveil the physical conditions and structure of the intermediate mass (IM) protostar IRAS 21391+5802 (IC 1396 N) at scales of ∼1000 AU. Methods. We have carried out high-angular resolution (1. ′′ 4) observations in the continuum at 3.1mm and in the N 2 H + 1→0, CH 3 CN 5 k →4 k and 13 CS 2→1 lines using the Plateau de Bure Interferometer (PdBI). In addition, we have merged t...

We report the results of a systematic search for redshifted rotational lines of CO and dust emission towards a sample of 9 high redshift radio quiet quasars using the IRAM Plateau de Bure interferometer. Dust emission at ∼ 1.35 mm has been found in 5 out of the 9 objects. These results confirm the corresponding previous detections with the MPIfR bolometer at the 30-m. No 3 mm continuum was dete...

We study the molecular gas content and distribution in the Coma cluster spiral galaxy NGC 4848 which is Hi deficient and where the remaining atomic gas is on one side of the galaxy, presumably because of the strong ram-pressure in the rich Coma cluster. Plateau de Bure interferometric CO(1–0) observations reveal a lopsided H2 distribution with an off-center secondary maximum coincident with the...

Context. Galaxy evolution scenarios predict that the feedback of star formation and nuclear activity (AGN) can drive the transformation of gas-rich spiral mergers into (ultra) luminous infrared galaxies and, eventually, lead to the build-up of QSO/elliptical hosts. Aims. We study the role that star formation and AGN feedback have in launching and maintaining the molecular outflows in two starbu...

Context. Intermediate-mass stars are an important ingredient of our Galaxy and key to understand how highand low-mass stars form in clusters. One of the closest known young intermediate-mass protoclusters is OMC-2 FIR 4, located at a distance of 420 pc, in Orion. This region is one of the few where the complete 500-2000 GHz spectrum has been observed with the heterodyne spectrometer HIFI on boa...