Characterizing interstellar filaments with Herschel in IC5146
ZAVAGNO, Annie
Laboratoire d'Astrophysique de Marseille [LAM]
Observatoire Astronomique de Marseille Provence [OAMP]
Laboratoire d'Astrophysique de Marseille [LAM]
Observatoire Astronomique de Marseille Provence [OAMP]
BONTEMPS, Sylvain
Observatoire aquitain des sciences de l'univers [OASU]
Université Sciences et Technologies - Bordeaux 1 [UB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Université Sciences et Technologies - Bordeaux 1 [UB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
MINIER, V.
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
MOTTE, F.
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
< Reduce
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
Institut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
Language
en
Article de revue
This item was published in
Astronomy and Astrophysics - A&A. 2011, vol. 529, p. L6
EDP Sciences
English Abstract
We provide a first look at the results of the Herschel Gould Belt survey toward the IC5146 molecular cloud and present a preliminary analysis of the filamentary structure in this region. The column density map, derived ...Read more >
We provide a first look at the results of the Herschel Gould Belt survey toward the IC5146 molecular cloud and present a preliminary analysis of the filamentary structure in this region. The column density map, derived from our 70-500 micron Herschel data, reveals a complex network of filaments, and confirms that these filaments are the main birth sites of prestellar cores. We analyze the column density profiles of 27 filaments and show that the underlying radial density profiles fall off as r^{-1.5} to r^{-2.5} at large radii. Our main result is that the filaments seem to be characterized by a narrow distribution of widths having a median value of 0.10 +- 0.03 pc, which is in stark contrast to a much broader distribution of central Jeans lengths. This characteristic width of ~0.1 pc corresponds to within a factor of ~2 to the sonic scale below which interstellar turbulence becomes subsonic in diffuse gas, supporting the argument that the filaments may form as a result of the dissipation of large-scale turbulence.Read less <
Origin
Hal imported