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- W2146321310 abstract "We report a survey for nitrogen sulfide (NS) toward regions of massive star formation. NS was observed by means of its 2Π1/2, J = 3/2 → 1/2, J = 5/2 → 3/2, and J = 7/2 → 5/2 transitions at 69, 115, and 161 GHz, respectively, and was detected toward 12 of 14 giant molecular clouds (GMCs) observed. Analysis of the hyperfine component relative line strengths suggests that NS emission is optically thin toward these sources, with the possible exception of Sgr B2(M). The fractional abundance of NS relative to molecular hydrogen is best defined for the Orion molecular cloud, where it is typically (1-4) × 10-10, which is about an order of magnitude larger than found by some recent gas-phase chemistry models developed for quiescent clouds. Toward OMC-1, the NS integrated intensity is strongly peaked toward KL, but also extends all along the Orion ridge, resembling the distribution of SO and CH3OH. We have identified a spectral feature seen toward several sources as the ortho-NKK = 404 → 313, J = 3 → 2, fine-structure component of methylene (CH2; cf. Hollis, Jewell, & Lovas). We also report the first detection of the SO+2Π1/2, J = 3/2 → 1/2, parity-e transition toward W51(MS) and L134N." @default.
- W2146321310 created "2016-06-24" @default.
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- W2146321310 date "1997-03-10" @default.
- W2146321310 modified "2023-09-30" @default.
- W2146321310 title "Nitrogen Sulfide in Giant Molecular Clouds" @default.
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- W2146321310 doi "https://doi.org/10.1086/303749" @default.
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