Clump mass function at an early stage of molecular cloud evolution: I. A statistical approach

Дата и время публикации : 2012-03-15T14:12:02Z

Авторы публикации и институты :
Sava Donkov
Todor V. Veltchev
Ralf S. Klessen

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Accepted in MNRAS; 12 pages, 6 figures
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: We derive the mass function of condensations (clumps) which were formed through a turbulent cascade over a range of spatial scales $Lle20$ pc during early, predominantly turbulent evolution of a molecular cloud. The approach rests upon the assumption of a statistical clump mass-density relationship $npropto m^x$ with a scale dependence of the exponent $x$ obtained from equipartition relations between various forms of energy of clumps. The derived clump mass function (ClMF) could be represented by series of 2 or 3 power laws, depending on the chosen equipartition relation, the velocity scaling index and the type of turbulent forcing. The high-mass ClMF exhibits an average slope $Gammasimeq-1$, typical for fractal clouds, whereas its intermediate-mass part is shallower or flattened, in agreement with some observational studies.

Category: Physics