ATLASGAL – properties of a complete sample of Galactic clumps★

作者：J. S. Urquhart, C. König, A. Giannetti, S. Leurini, T. J. T. Moore, David Eden, T. Pillai, M. A. Thompson, Catherine Braiding, Michael Burton, T. Csengeri, J. T. Dempsey, C. Figura, D. Froebrich, K. M. Menten, F. Schüller, M. D. Smith, F. Wyrowski · 发表于：Monthly Notices of the Royal Astronomical Society · 年份：2017 · DOI：10.1093/mnras/stx2258 · 被引用次数：362 · 研究领域：Astrophysics and Star Formation Studies、Stellar, planetary, and galactic studies、Galaxies: Formation, Evolution, Phenomena

The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) is an unbiased 870 µm submillimetre survey of the inner Galactic plane (|ℓ| < 60 • with |b| < 1.• 5).It is the largest and most sensitive ground-based submillimetre wavelength Galactic survey to date and has provided a large and systematic inventory of all massive, dense clumps in the Galaxy (≥1000 M at a heliocentric distance of 20 kpc) and includes representative samples of all of the earliest embedded stages of high-mass star formation.Here, we present the first detailed census of the properties (velocities, distances, luminosities and masses) and spatial distribution of a complete sample of ∼8000 dense clumps located in the Galactic disc (5 • < |ℓ| < 60 • ).We derive highly reliable velocities and distances to ∼97 per cent of the sample and use midand far-infrared survey data to develop an evolutionary classification scheme that we apply to the whole sample.Comparing the evolutionary subsamples reveals trends for increasing dust temperatures, luminosities and linewidths as a function of evolution indicating that the feedback from the embedded protoclusters is having a significant impact on the structure and dynamics of their natal clumps.We find that the vast majority of the detected clumps are capable of forming a massive star and 88 per cent are already associated with star formation at some level.We find the clump mass to be independent of evolution suggesting that the clumps form with the majority of their ...