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Cluster-formation in the Rosette molecular cloud at the junctions of filaments
Schneider N., Csengeri T., Hennemann M., Motte F., Didelon P., Federrath C., Bontemps S., Di Francesco J., Arzoumanian D., Minier V. et al
Astronomy and Astrophysics 540 (2012) L11 - http://hal.archives-ouvertes.fr/hal-00685399
Articles dans des revues avec comité de lecture
Planète et Univers/Astrophysique/Astrophysique stellaire et solaire
Physique/Astrophysique/Astrophysique stellaire et solaire
Cluster-formation in the Rosette molecular cloud at the junctions of filaments
N. Schneider 1, T. Csengeri 2, M. Hennemann 2, F. Motte 2, 3, P. Didelon 2, C. Federrath, S. Bontemps 4, 5, 6, 7, J. Di Francesco 8, D. Arzoumanian, V. Minier 2, 3, Ph. André 2, T. Hill 2, A. Zavagno, Q. Nguyen-Luong 2, M. Attard, J. -Ph. Bernard 9, D. Elia, C. Fallscheer, M. Griffin 10, J. Kirk, R. Klessen, V. Könyves, P. Martin, A. Men'shchikov 2, P. Palmeirim, N. Peretto 2, M. Pestalozzi, D. Russeil, S. Sadavoy 8, T. Sousbie 11, L. Testi 12, P. Tremblin, D. Ward-Thompson 10, G. White 13
1 :  Laboratory for Atmospheric and Space Physics
University of Colorado
Boulder
États-Unis
2 :  Astrophysique Interactions Multi-échelles (AIM - UMR 7158)
http://irfu.cea.fr/Sap/
CNRS : UMR7158 – INSU – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
AIM - UMR 7158, Service d'astrophysique, CEA/Saclay, Orme des Merisiers F-91191 GIF SUR YVETTE CEDEX
France
3 :  Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU)
CEA : DSM/IRFU
France
4 :  Observatoire aquitain des sciences de l'univers (OASU)
http://www.oasu.u-bordeaux1.fr/
CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I
0ASU - Site de Floirac 2 rue de l'Observatoire - BP 89 33270 FLOIRAC
France
5 :  Université Sciences et Technologies - Bordeaux 1
http://www.u-bordeaux1.fr
Université Sciences et Technologies - Bordeaux I
351 cours de la Libération - 33405 Talence cedex
France
6 :  Laboratoire d'Astrophysique de Bordeaux (LAB)
http://www.obs.u-bordeaux1.fr
CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I
2 rue de l'Observatoire B.P. 89 33270 FLOIRAC
France
7 :  Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB)
http://www.obs.u-bordeaux1.fr
CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I
BP89 33270 Floirac
France
8 :  National Research Council of Canada, Herzberg Institute of Astrophysics
Herzberg Institute of Astrophysics
University of Victoria, Department of Physics and Astronomy
Canada
9 :  Centre d'étude spatiale des rayonnements (CESR)
http://www.cesr.fr
CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier (UPS) - Toulouse III
9 Av du colonel Roche - BP 4346 31028 TOULOUSE CEDEX 4
France
10 :  School of Physics & Astronomy
Cardiff University
Cardiff University, Queens Buildings The Parade, Cardiff CF24 3AA
Royaume-Uni
11 :  Centre de Recherche Astrophysique de Lyon (CRAL)
http://www-obs.univ-lyon1.fr/
CNRS : UMR5574 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure (ENS) - Lyon
9 Avenue Charles André 69561 ST GENIS LAVAL CEDEX
France
12 :  European Southern Observatory (ESO)
http://www.eso.org/
ESO
Karl-Schwarzchild Str. 2 D-85748 Garching bei Munchen
Allemagne
13 :  Rutherford Appleton Laboratory - Didcot (RAL)
http://www.scitech.ac.uk/About/Conts/Find/RAL/Introduction.aspx
Science & Technologie Facilities Council
Science and Technology Facilities Council Rutherford Appleton Laboratory Harwell Science and Innovation Campus Didcot OX11 0QX
Royaume-Uni
FORMATION STELLAIRE 2012
For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger subsequent star formation. However, hydrodynamic models including radiation and gravity show that UV-illumination has little or no impact on the global dynamical evolution of the cloud. The Rosette molecular cloud, irradiated by the NGC2244 cluster, is a template region for triggered star-formation, and we investigated its spatial and density structure by applying a curvelet analysis, a filament-tracing algorithm (DisPerSE), and probability density functions (PDFs) on Herschel column density maps, obtained within the HOBYS key program. The analysis reveals not only the filamentary structure of the cloud but also that all known infrared clusters except one lie at junctions of filaments, as predicted by turbulence simulations. The PDFs of sub-regions in the cloud show systematic differences. The two UV-exposed regions have a double-peaked PDF we interprete as caused by shock compression. The deviations of the PDF from the log-normal shape typically associated with low- and high-mass star-forming regions at Av~3-4m and 8-10m, respectively, are found here within the very same cloud. This shows that there is no fundamental difference in the density structure of low- and high-mass star-forming regions. We conclude that star-formation in Rosette - and probably in high-mass star-forming clouds in general - is not globally triggered by the impact of UV-radiation. Moreover, star formation takes place in filaments that arose from the primordial turbulent structure built up during the formation of the cloud. Clusters form at filament mergers, but star formation can be locally induced in the direct interaction zone between an expanding HII--region and the molecular cloud.
Anglais
29/03/2012

Astronomy and Astrophysics (Astron. Astrophys.)
Publisher EDP Sciences
ISSN 0004-6361 (eISSN : 1432-0756)
internationale
2012
540
L11

Astrophysics - Galaxy Astrophysics
FORMATION STELLAIRE 2012

Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1203.6472