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Properties of interstellar filaments as derived from Herschel observations

Arzoumanian, Doris, Andre, Philippe, Peretto, Nicolas and Koenyves, Vera 2014. Properties of interstellar filaments as derived from Herschel observations. In: Stamatellos, D, Goodwin, S and Ward-Thompson, D eds. The Labyrinth of Star Formation, Vol. 36. Astrophysics and Space Science Proceedings, Springer, pp. 259-263. (10.1007/978-3-319-03041-8_49)

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We present a scenario for filament formation and evolution motivated by recent observational results of nearby molecular clouds. The analysis of more than 250 filaments observed in 7 regions by the Herschel Gould Belt Survey show that the filaments are characterized by a narrow distribution of central width sharply peaked at ∼ 0.1 pc. This typical filament width corresponds, within a factor of ∼ 2 to the sonic scale below which interstellar turbulence becomes subsonic in diffuse gas, which may suggest that the filaments form as a result of the dissipation of large-scale turbulence. The analysis of IRAM 30 m molecular line observations of a sample of these filaments show evidence of an increase in non-thermal velocity dispersion with column density which suggest an evolution of the supercritical filaments in mass per unit length while accreting surrounding material.

Item Type: Book Section
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: Springer
ISBN: 978-3-319-03040-1
Last Modified: 18 Feb 2019 16:15

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