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The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12

Henning, Thomas, Linz, Hendrik, Krause, Oliver, Ragan, Sarah, Beuther, Henrik, Launhardt, Ralf, Nielbock, Markus and Vasyunina, Tatiana 2010. The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12. Astronomy and Astrophysics 518 , A95. 10.1051/0004-6361/201014635

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Context. Infrared-dark clouds (IRDCs) are the precursors to massive stars and stellar clusters. G011.11-0.12 is a well-studied filamentary IRDC, though, to date, the absence of far-infrared data with sufficient spatial resolution has limited the understanding of the structure and star-formation activity. Aims: We use Herschel to study the embedded population of young pre- and protostellar cores in this IRDC. Methods: We examine the cloud structure, which appears in absorption at short wavelength and in emission at longer wavelength. We derive the properties of the massive cores from the spectral energy distributions of bright far-infrared point sources detected with the PACS instrument aboard Herschel. Results: We report on the detection and characterization of pre- and protostellar cores in a massive filamentary infrared-dark cloud G011.11-0.12 using PACS. We characterize 18 cores directly associated with the filament, two of which have masses over 50 M_⊙, making them the best candidates to become massive stars in G011.11-0.12. These cores are likely at various stages of protostar formation, showing elevated temperature (< T > ~ 22 K) with respect to the ambient gas reservoir. The core masses (< M > ~ 24 M_⊙) are small compared to that in the cold filament. The mean core separation is 0.9 pc, well in excess of the Jeans length in the filament. Conclusions: We confirm that star formation in IRDCs is underway and diverse, and IRDCs have the capability of forming massive stars and clusters.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 27 November 2017
Date of Acceptance: 28 April 2010
Last Modified: 28 Nov 2017 22:04

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