منابع مشابه
The Youngest Stellar clusters Clusters associated with massive protostellar candidates
We report on the identification of 54 embedded clusters around 217 massive protostellar candidates of which 34 clusters are new detections. The embedded clusters are identified as stellar surface density enhancements in the 2 µm All Sky Survey (2MASS) data. Because the clusters are all associated with massive stars in their earliest evolutionary stage, the clusters should also be in an early st...
متن کاملSearch for massive protostellar candidates in the southern hemisphere : I . Association with dense gas
We have observed two rotational transitions of both CS and C 17 O, and the 1.2 mm continuum emission towards a sample of 130 high-mass protostellar candidates with δ < −30 •. This work represents the first step of the extension to the southern hemisphere of a project started more than a decade ago aimed at the identification of massive protostellar candidates. Following the same approach adopte...
متن کاملNature of two massive protostellar candidates : IRAS 21307 + 5049 and IRAS 22172 + 5549
We present observations of continuum and molecular lines towards the protostar candidates IRAS 21307+5049 and IRAS 22172+5549. Single-dish maps in the 12 CO (2–1), C 18 O (2–1), H 13 CO + (1–0) lines and 850 µm continuum are compared with interferometric maps in the 12 CO (1–0) line and 3 mm continuum, and with mid-and near-infrared images. Also, single-pointing spectra of the CH3C2H (6–5), (8–...
متن کاملSearch for Co Outflows toward a Sample of 69 High-mass Protostellar Candidates: Frequency of Occurrence
A survey for molecular outflows was carried out by mapping the CO line toward a sample of 69 J p 2–1 luminous IRAS point sources. Sixty objects have IRAS luminosities from 10 to 10 L, and are associated with dense gas traced by NH3, identifying them as high-mass star-forming regions. Among 69 sources, 65 sources have data that are suitable for outflow identification. Thirty-nine regions show sp...
متن کاملModelling submillimetre spectra of the protostellar infall candidates NGC1333–IRAS2 and Serpens SMM4
We present a radiative transfer model, which is applicable to the study of submillimetre spectral line observations of protostellar envelopes. The model uses an exact, non-LTE, spherically symmetric radiative transfer ‘Stenholm’ method, which numerically solves the radiative transfer problem by the process of ‘Λ-iteration’. We also present submillimetre spectral line data of the Class 0 protost...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900095413