A simple analytic model of radiative transfer in two parts of a contracting cloud matches a
wide range of line profiles in candidate infall regions and provides a sensitive estimate of V in, …

We report observations of 47 candidate protostars in two optically thick lines [H 2 CO (2 12–1
11) and CS (2–1)] and one optically thin line [N 2 H+(1–0)] using the IRAM 30 m, SEST 15 …

We present interferometer observations of CS J= 5–4 emission in B335, an isolated round
globule generally recognized from single-dish spectral line mapping to be the best candidate …

Lines of N 2 H+, C 3 H 2, and H 2 CO show kinematic evidence of gravitational infall in L1527,
and probably also in L483. Three trends appear to indicate infall, rather than outflow or …

Millimeter wavelength observations are presented of NGC 1333 IRAS 4, a group of highly
embedded young stellar objects in Perseus, that reveal motions of infall, outflow, rotation, and …

… 4 # 10 The large-scale (∼0.1 pc) inward motions observed by T98, possibly driven by
turbulent pressure gradients (Myers & Lazarian 1998) and not included in the above models, …

We have used the NRAO Very Large Array to search for 3.6 cm continuum emission from
embedded protostars in a sample of eight nearby" starless" cores that show spectroscopic …

We present 3 ′′ (∼400 AU ) OVRO and IRAM interferometer observations at λ=3.0 mm
and 1.3 mm of L1527, one of the closest protostellar collapse candidates, We imaged high …

… We adopt an outer boundary of Rout ž 0:15 pc in the models; this is well constrained by both
the … The spatial scale on the top is defined as 250 pc =D � �, where D is the baseline length. …

… We thank Diego Mardones for his efforts on the D configuration data set. We acknowledge
the IRAM staff from the Plateau de Bure and Grenoble for carrying out all the observations and …