Clumps and triggered star formation in ionized molecular clouds

0423674 - ASÚ 2014 RIV GB eng J - Článek v odborném periodiku
Walch, S. - Whitworth, A. - Bisbas, T. - Wünsch, Richard - Hubber, D.A.
Clumps and triggered star formation in ionized molecular clouds.
Monthly Notices of the Royal Astronomical Society. Roč. 435, č. 2 (2013), s. 917-927. ISSN 0035-8711. E-ISSN 1365-2966
Grant CEP: GA ČR GAP209/12/1795
Institucionální podpora: RVO:67985815
Klíčová slova: hydrodynamics * stars formation * ISM bubbles
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 5.226, rok: 2013

Infrared shells and bubbles are ubiquitous in the Galaxy and can generally be associated with H II regions formed around young, massive stars. In this paper, we use high-resolution 3D SPH simulations to explore the effect of a single O7 star emitting photons at 10(49) s(-1) and located at the centre of a molecular cloud with mass 10(4) M-circle dot and radius 6.4 pc; the internal structure of the cloud is characterized by its fractal dimension, D (with 2.0 <= D <= 2.8), and the variance of its (lognormal) density distribution, sigma(2)(O) (with 0.36 <= sigma(2)(O) <= 1.42). Our study focuses on the morphology of the swept-up cold gas and the distribution and statistics of the resulting star formation. If the fractal dimension is low, the border of the H II region is dominated by extended shell-like structures, and these break up into a small number of massive high-density clumps which then spawn star clusters; star formation occurs relatively quickly, and delivers somewhat higher stellar masses.
Trvalý link: http://hdl.handle.net/11104/0229846