DC3N observations towards high-mass star-forming regions

Observations of Infall in Star-forming Regions

Molecular Outflows in Low- and High-Mass Star Forming Regions

We review the known properties of molecular outflows from lowand high-mass young stars. General trends among outflows are identified, and the most recent studies on the morphology, kinematics, energetics, and evolution of molecular outflows are discussed, focusing on results from high-resolution millimeter observations. We review the existing four broad classes of outflow models and compare num...

VLBI observations of 6.7 and 12.2 GHz methanol masers toward high mass star-forming regions

We present VLBI observations of 6.7 and 12.2 GHz methanol masers in 14 star-forming regions, namely NGC 7538, S 252, W 75N, W 48, G 31.28+0.06, S 231, S 255, S 269, Mon R2, G 9.62+0.20, Cep A, W 51, G 59.78+0.06 and G 29.950.02. In 10 of these sources, the methanol masers show elongated morphologies in the VLBI map and exhibit linear velocity gradients. These linear structures have lengths of 5...

Hydrogen Fluoride in High-Mass Star-forming Regions

Hydrogen fluoride has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be approximately two orders of magnitude lower. We present Herschel/HIFI observations of HF J = 1−0 toward two high-mass star formation sites, NGC6334 I and AFGL 2591. In NGC6334 I the HF line is seen in absorption in foreg...

On the Identification of High Mass Star Forming Regions Using Iras: Contamination by Low-mass Protostars

We present the results of a survey of a small sample (14) of low-mass protostars (LIR < 103 L⊙) for 6.7 GHz methanol maser emission performed using the ATNF Parkes radio telescope. No new masers were discovered. We find that the lower luminosity limit for maser emission is near 103 L⊙, by comparison of the sources in our sample with previously detected methanol maser sources. We examine the IRA...