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- W3100282621 endingPage "A75" @default.
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- W3100282621 abstract "The formation processes and the evolutionary stages of high-mass stars are poorly understood compared to low-mass stars. Large-scale surveys are needed to provide an unbiased census of high column density sites which can potentially host precursors to high-mass stars. Here we use the ATLASGAL survey covering 420 sq. degree of the Galactic plane at 870 $mu$m; and use the MRE-GLC method to identify the population of embedded sources throughout the inner Galaxy. We identify in total 10861 compact sub-millimeter sources with fluxes above 5 sigma. Completeness tests show that our catalogue is 97% complete above 5 sigma and >99% complete above 7$sigma$. We correlate this sample with mid-infrared point source catalogues (MSX at 21.3 $mu$m and WISE at 22 $mu$m) and determine a lower limit of ~33% that are associated with embedded protostellar objects. We note that the proportion of clumps associated with mid-infrared sources increases with increasing flux density, achieving a rather constant fraction of ~75% of all clumps with fluxes over 5 Jy/beam being associated with star-formation. Examining the source counts as a function of Galactic longitude we are able to identify the most prominent star forming regions in the Galaxy. From the fraction of the likely massive quiescent clumps (~25%) we estimate a formation time-scale of ~7.5+/-2.5 $times$ 10$^4$yr for the deeply embedded phase before the emergence of luminous YSOs. Such a short duration for the formation of high-mass stars in massive clumps clearly proves that the earliest phases have to be dynamic with supersonic motions." @default.
- W3100282621 created "2020-11-23" @default.
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- W3100282621 date "2014-05-01" @default.
- W3100282621 modified "2023-10-17" @default.
- W3100282621 title "The ATLASGAL survey: a catalog of dust condensations in the Galactic plane" @default.
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