The Mysterious Sickle Object in the Carina Nebula: A stellar wind induced bow shock grazing a clump?
| Autor: | Ngoumou, Judith, Preibisch, Thomas, Ratzka, Thorsten, Burkert, Andreas |
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| Rok vydání: | 2013 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/769/2/139 |
| Popis: | Optical and near-infrared images of the Carina Nebula show a peculiar arc-shaped feature, which we call the "Sickle", next to the B-type star Trumpler 14 MJ 218. We use multi-wavelength observations to explore and constrain the nature and origin of the nebulosity. Using sub-mm data from APEX/LABOCA as well as Herschel far-infrared maps, we discovered a dense, compact clump with a mass of ~ 40 Msun located close to the apex of the Sickle. We investigate how the B-star MJ 218, the Sickle, and the clump are related. Our numerical simulations show that, in principle, a B-type star located near the edge of a clump can produce a crescent-shaped wind shock front, similar to the observed morphology. However, the observed proper motion of MJ 218 suggest that the star moves with high velocity (~ 100 km/s) through the ambient interstellar gas. We argue that the star is just about to graze along the surface of the clump, and the Sickle is a bow shock induced by the stellar wind, as the object moves supersonically through the density gradient in the envelope of the clump. Comment: Accepted for publication in ApJ(8 pages, 6 figures). A high quality preprint is available at: http://www.usm.uni-muenchen.de/people/preibisch/publications.html |
| Databáze: | arXiv |
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