We study the origin of the non-thermal profiles observed in filamentary structures in Galactic molecular clouds by means of numerical dynamical simulations. We find that such profiles are intrinsic features of the end products of dissipationless collapse in cylindrical sym- metry. Moreover, for sufficiently cold initial conditions, we obtain end states characterized by markedly anticorrelated radial density and temperature profiles. Gravitational, dissipationless dynamics alone is thus sufficient to reproduce, at least qualitatively, many of the properties of the observed non-thermal structures.
Non-thermal states in models of filaments: a dynamical study / Piefrancesco Di Cintio, Shamik Gupta, Lapo Casetti. - In: MEMORIE DELLA SOCIETÀ ASTRONOMICA ITALIANA. - ISSN 1824-016X. - STAMPA. - 88:(2017), pp. 733-734. (Intervento presentato al convegno Francesco's Legacy; Star Formation in Space and Time tenutosi a Firenze nel 5-9 giugno 2017).
Non-thermal states in models of filaments: a dynamical study
Lapo Casetti
2017
Abstract
We study the origin of the non-thermal profiles observed in filamentary structures in Galactic molecular clouds by means of numerical dynamical simulations. We find that such profiles are intrinsic features of the end products of dissipationless collapse in cylindrical sym- metry. Moreover, for sufficiently cold initial conditions, we obtain end states characterized by markedly anticorrelated radial density and temperature profiles. Gravitational, dissipationless dynamics alone is thus sufficient to reproduce, at least qualitatively, many of the properties of the observed non-thermal structures.
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