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Centre d'étude spatiale des rayonnements |  |
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Centre d'étude spatiale des rayonnements | |
| HAL: hal-00685399, version 1 |
| arXiv: 1203.6472 |
| DOI: 10.1051/0004-6361/201118566 |
| Detailed view |  Export this paper |
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| Astronomy and Astrophysics 540 (2012) L11 |
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| Cluster-formation in the Rosette molecular cloud at the junctions of filaments |
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| N. Schneider 1T. Csengeri 2 |
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| (2012) |
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| 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. |
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| 1: | Laboratory for Atmospheric and Space Physics |
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University of Colorado |
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| 2: | Astrophysique Interactions Multi-échelles (AIM) |
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CNRS : UMR7158 – INSU – Université Paris VII - Paris Diderot – CEA : DSM/IRFU |
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| 3: | Laboratoire AIM (AIM) |
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CEA – Université Paris VII - Paris Diderot |
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| 4: | Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU) |
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CEA : DSM/IRFU |
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| 5: | Observatoire aquitain des sciences de l'univers (OASU) |
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CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 6: | Université Sciences et Technologies - Bordeaux 1 |
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Université Sciences et Technologies - Bordeaux I |
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| 7: | Laboratoire d'Astrophysique de Bordeaux (LAB) |
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CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 8: | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB) |
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CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 9: | National Research Council of Canada, Herzberg Institute of Astrophysics |
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Herzberg Institute of Astrophysics |
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| 10: | Centre d'étude spatiale des rayonnements (CESR) |
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CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 11: | School of Physics & Astronomy |
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Cardiff University |
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| 12: | Centre de Recherche Astrophysique de Lyon (CRAL) |
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CNRS : UMR5574 – INSU – Université Claude Bernard - Lyon I – École Normale Supérieure - Lyon |
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| 13: | European Southern Observatory (ESO) |
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ESO |
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| 14: | Rutherford Appleton Laboratory - Didcot (RAL) |
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Science & Technologie Facilities Council |
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| FORMATION STELLAIRE 2012 |
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| Subject | : | Sciences of the Universe/Astrophysics/Solar and Stellar Astrophysics Physics/Astrophysics/Solar and Stellar Astrophysics |
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| Astrophysics - Galaxy Astrophysics |
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| Fulltext link: |
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| http://fr.arXiv.org/abs/1203.6472 |
| hal-00685399, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00685399 | |
| oai:hal.archives-ouvertes.fr:hal-00685399 | |
| From: Marie-Paule Pomies | |
| Submitted on: Thursday, 5 April 2012 09:15:18 | |
| Updated on: Tuesday, 10 April 2012 09:03:12 | |
