HYDROGEN FLUORIDE IN HIGH-MASS STAR-FORMING REGIONS
نویسندگان
چکیده
منابع مشابه
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...
متن کاملMolecular 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...
متن کاملHigh resolution magnetic field measurements in high-mass star-forming regions
A number of different formation scenarios have been proposed to explain the formation of stars with masses larger than about 8 M⊙. These include formation through the merger of less massive stars (Coalescence model) or through the accretion of unbound gas from the molecular cloud (Competitive accretion model). In the third scenario, Core accretion model, massive stars form through gravitational...
متن کاملProtostellar clusters in intermediate mass ( IM ) star forming regions
Context. The transition between the low density groups of T Tauri stars and the high density clusters around massive stars occurs in the intermediate-mass (IM) range (M * ∼2–8 M ⊙). High spatial resolution studies of IM young stellar objects (YSO) can provide important clues to understand the clustering in massive star forming regions. Aims. Our aim is to search for clustering in IM Class 0 pro...
متن کاملOn 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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/756/2/136