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The Herschel view of star formation in the Rosette molecular cloud under the influence of NGC 2244

Schneider, N., Motte, F., Bontemps, S., Hennemann, M., Di Francesco, J., André, Ph., Zavagno, A., Csengeri, T., Men'shchikov, A., Abergel, A., Baluteau, J.-P., Bernard, J.-Ph., Cox, P., Didelon, P., di Giorgio, A.-M., Gastaud, R., Griffin, Matthew Joseph, Hargrave, Peter Charles, Hill, T., Huang, M., Kirk, Jason M., Könyves, V., Leeks, S., Li, J. Z., Marston, A., Martin, P., Minier, V., Molinari, S., Olofsson, G., Panuzzo, P., Persi, P., Pezzuto, S., Roussel, H., Russeil, D., Sadavoy, S., Saraceno, P., Sauvage, M., Sibthorpe, B., Spinoglio, L., Testi, L., Teyssier, D., Vavrek, R., Ward-Thompson, Derek, White, G., Wilson, C. D. and Woodcraft, Adam 2010. The Herschel view of star formation in the Rosette molecular cloud under the influence of NGC 2244. Astronomy and Astrophysics 518 , L83. 10.1051/0004-6361/201014627

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Abstract

Context. The Rosette molecular cloud is promoted as the archetype of a triggered star-formation site. This is mainly due to its morphology, because the central OB cluster NGC 2244 has blown a circular-shaped cavity into the cloud and the expanding H II-region now interacts with the cloud. Aims. Studying the spatial distribution of the different evolutionary states of all star-forming sites in Rosette and investigating possible gradients of the dust temperature will help to test the “triggered star-formation” scenario in Rosette. Methods. We use continuum data obtained with the PACS (70 and 160 μm) and SPIRE instruments (250, 350, 500 μm) of the Herschel telescope during the science demonstration phase of HOBYS. Results. Three-color images of Rosette impressively show how the molecular gas is heated by the radiative impact of the NGC 2244 cluster. A clear negative temperature gradient and a positive density gradient (running from the H II-region/molecular cloud interface into the cloud) are detected. Studying the spatial distribution of the most massive dense cores (size scale 0.05 to 0.3 pc), we find an age-sequence (from more evolved to younger) with increasing distance to the cluster NGC 2244. No clear gradient is found for the clump (size-scale up to 1 pc) distribution. Conclusions. The existence of temperature and density gradients and the observed age-sequence imply that star formation in Rosette may indeed be influenced by the radiative impact of the central NGC 2244 cluster. A more complete overview of the prestellar and protostellar population in Rosette is required to obtain a firmer result.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: ISM: clouds / dust, extinction / ISM: general / infrared: ISM / submillimeter: ISM
Publisher: EDP Sciences
ISSN: 0004-6361
Last Modified: 04 Aug 2018 00:23
URI: http://orca.cf.ac.uk/id/eprint/11033

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