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• W1977576701 abstract "In an effort to identify very young sites of massive star formation, we have conducted a survey for hot and dense molecular cores toward a sample of 17 southern sources. The sample consists of sources with IRAS color characteristics of ultracompact H II regions for which high-density molecular material had previously been detected. We observed the J = 5-4, 6-5, 8-7, and 12-11 rotational transitions of CH3CN and derived rotation temperatures and column densities using the population-diagram technique. We identify four sources with a high-temperature molecular component (Trot > 90 K) as new candidates for hot molecular cores. We also observed the transitions H35α, CS J = 3-2, and the continuum in the 3, 2 mm bands toward 17 sources, and the 1.3 mm continuum, H41α and 13CO J = 2-1 transitions toward 10 sources. Eight sources show blue and red wings in the CS J = 3-2 line, whereas three sources show wings in the 13CO J = 2-1 spectra, suggestive of molecular outflows. Our continuum and recombination line data show that the 91 GHz continuum emission is dominated by free-free emission from ionized regions, whereas at 147 GHz emission from dust grains contributes significantly." @default.
• W1977576701 created "2016-06-24" @default.
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• W1977576701 date "2005-04-01" @default.
• W1977576701 modified "2023-10-18" @default.
• W1977576701 title "CH ₃ CN Observations toward Southern Massive Star‐forming Regions" @default.
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• W1977576701 doi "https://doi.org/10.1086/427187" @default.
• W1977576701 hasPublicationYear "2005" @default.
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