A possible observational bias in the estimation of the virial parameter in virialized clumps

A. Traficante, Y. N. Lee, P. Hennebelle, S. Molinari, J. Kauffmann, T. Pillai

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

The dynamics of massive clumps, the environment where massive stars originate, is still unclear. Many theories predict that these regions are in a state of near-virial equilibrium, or near energy equi-partition, while others predict that clumps are in a sub-virial state. Observationally, the majority of the massive clumps are in a sub-virial state with a clear anti-correlation between the virial parameter αvir and the mass of the clumps Mc, which suggests that the more massive objects are also the more gravitationally bound. Although this trend is observed at all scales, from massive clouds down to star-forming cores, theories do not predict it. In this work we show how, starting from virialized clumps, an observational bias is introduced in the specific case where the kinetic and the gravitational energies are estimated in different volumes within clumps and how it can contribute to the spurious αvir-Mc anti-correlation in these data. As a result, the observed effective virial parameter αeff < αvir, and in some circumstances it might not be representative of the virial state of the observed clumps.

原文英語
文章編號L7
期刊Astronomy and Astrophysics
619
DOIs
出版狀態已發佈 - 2018 11月 1
對外發佈

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學

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