Mass-size scaling M similar to r(1.67) of massive star-forming clumps - evidences of turbulence-regulated gravitational collapse

Zhang, Chuan-Peng und Li, Guang-Xing (2017): Mass-size scaling M similar to r(1.67) of massive star-forming clumps - evidences of turbulence-regulated gravitational collapse. In: Monthly Notices of the Royal Astronomical Society, Bd. 469, Nr. 2: S. 2286-2291

Abstract

We study the fragmentation of eight massive clumps using data from ATLASGAL 870 mu m, SCUBA 850 and 450 mu m, PdBI 1.3 and 3.5 mm, and probe the fragmentation from 1 to 0.01 pc scale. We find that the masses and the sizes of our objects follow M similar to r(1.68 +/- 0.05). The results are in agreements with the predictions of Li where M similar to r(5/3). Inside each object, the densest structures seem to be centrally condensed, with rho(r) similar to r(-2). Our observational results support a scenario where molecular gas in the Milky Way is supported by a turbulence characterized by a constant energy dissipation rate, and gas fragments like clumps and cores are structures which are massive enough to be dynamically detached from the ambient medium.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch