Characterizing interstellar filaments with Herschel in IC5146 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2011

Characterizing interstellar filaments with Herschel in IC5146

D. Arzoumanian
V. Konyves
  • Fonction : Auteur
T. Hill1
  • Fonction : Auteur
P. Martin
  • Fonction : Auteur
C. D. Wilson
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-00572905 , version 1 (02-03-2011)

Identifiants

Citer

D. Arzoumanian, Ph. André, P. Didelon, V. Konyves, N. Schneider, et al.. Characterizing interstellar filaments with Herschel in IC5146. Astronomy and Astrophysics - A&A, 2011, 529, pp.L6. ⟨10.1051/0004-6361/201116596⟩. ⟨hal-00572905⟩
403 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More