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- W1969892745 abstract "We present near-infrared and millimeter-wave observations of six high-mass star-forming regions in the fourth quadrant: RCW 108, G333.6, RCW 117, RCW 122, NGC 6334 I, and G351.6. These regions have heliocentric distances of 1.3–3.0 kpc and total luminosities ranging from 0.5 to 3 × 105 L⊙. Millimeter maps taken in transitions of C18O, HC3N, 12C16O, and SiO with the Swedish-ESO Submillimetre Telescope 15 m telescope detail the structure and kinematics of the clouds. Near-infrared K-band images of the same regions obtained with the MPG/ESO 2.2 m telescope are used to map the stellar surface density. The C18O (1 → 0) line shows extended high column density gas, with column densities ranging from 1022 to 3 × 1023 cm-2; in contrast, the HC3N (15 → 14) emission shows eight sharply peaked dense cores. We examine these cores for recent and ongoing star formation by searching for high-velocity, non-Gaussian wings on the CO (1 → 0) and SiO (2 → 1) lines, peaks in the surface density of stars, and positional coincidences with IRAS point sources, as well as masers and H II regions reported in the literature. All of the cores show evidence of ongoing star formation. NGC 6334 I(N) stands out as a unique case in which an outflow has formed and masers have appeared, but no IRAS source, K-band cluster, or UC H II region has yet appeared; our data support previous claims that this is a rare example of a core in the earliest stages of forming a cluster of high- and low-mass stars." @default.
- W1969892745 created "2016-06-24" @default.
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- W1969892745 date "2004-11-01" @default.
- W1969892745 modified "2023-09-27" @default.
- W1969892745 title "A Near-Infrared/Millimeter-Wave Study of Six Fourth-Quadrant High-Mass Star Formation Regions" @default.
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- W1969892745 doi "https://doi.org/10.1086/425044" @default.
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