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Title:
Characterizing interstellar filaments with Herschel in IC 5146
Authors:
Arzoumanian, D.; André, Ph.; Didelon, P.; Könyves, V.; Schneider, N.; Men'shchikov, A.; Sousbie, T.; Zavagno, A.; Bontemps, S.; di Francesco, J.; Griffin, M.; Hennemann, M.; Hill, T.; Kirk, J.; Martin, P.; Minier, V.; Molinari, S.; Motte, F.; Peretto, N.; Pezzuto, S.; Spinoglio, L.; Ward-Thompson, D.; White, G.; Wilson, C. D.
Affiliation:
AA(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France ), AB(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France ), AC(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AD(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AE(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AF(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AG(Institute d'Astrophysique de Paris, UMR 7095 CNRS, Université Pierre et Marie Curie, 98bis Boulevard Arago, 75014, Paris, France), AH(Laboratoire d'Astrophysique de Marseille, CNRS/INSU-Université de Provence, 13388, Marseille Cedex 13, France), AI(Université de Bordeaux, OASU, Bordeaux, France), AJ(National Research Council of Canada, Herzberg Institute of Astrophysics, University of Victoria, Department of Physics and Astronomy, Victoria, Canada), AK(School of Physics and Astronomy, Cardiff University, Cardiff, UK), AL(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AM(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AN(School of Physics and Astronomy, Cardiff University, Cardiff, UK), AO(Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON, M5S 3H8, Canada), AP(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AQ(IFSI - INAF, via Fosso del Cavaliere 100, 00133, Roma, Italy), AR(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AS(Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, 91191, Gif-sur-Yvette, France), AT(IFSI - INAF, via Fosso del Cavaliere 100, 00133, Roma, Italy), AU(IFSI - INAF, via Fosso del Cavaliere 100, 00133, Roma, Italy), AV(School of Physics and Astronomy, Cardiff University, Cardiff, UK), AW(The Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0NL, UK; Department of Physics and Astronomy, The Open University, Milton Keynes, UK), AX(Department of Physics and Astronomy, McMaster University, Hamilton, ON, L8S 4M1, Canada)
Publication:
Astronomy & Astrophysics, Volume 529, id.L6 (A&A Homepage)
Publication Date:
05/2011
Origin:
EDP Sciences
Astronomy Keywords:
stars: formation, ISM: individual objects: IC 5146, ISM: clouds, ISM: structure, submillimeter: ISM
DOI:
10.1051/0004-6361/201116596
Bibliographic Code:
2011A&A...529L...6A

Abstract

We provide a first look at the results of the Herschel Gould Belt survey toward the IC 5146 molecular cloud and present a preliminary analysis of the filamentary structure in this region. The column density map, derived from our 70-500 μm 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 with 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, which supports the argument that the filaments may form as a result of the dissipation of large-scale turbulence.

Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Figures 1, 2, 5, 6, Tables 1-2, and Appendix A are only available in electronic form at http://www.aanda.org

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