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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559241.0, MPI für Astronomie / Publikationen_mpia
The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12
Authors:Henning, Th; Linz, H.; Krause, O.; Ragan, S.; Beuther, H.; Launhardt, R.; Nielbock, M.; Vasyunina, T.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.L95
Sequence Number of Article:10.1051/0004-6361/201014635
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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. <BR /> Aims: We use Herschel to study the embedded population of young pre- and protostellar cores in this IRDC. <BR /> 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. <BR /> 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_ȯ, 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_ȯ) 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. <BR /> Conclusions: We confirm that star formation in IRDCs is underway and diverse, and IRDCs have the capability of forming massive stars and clusters. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. It is open for proposals for observing time from the worldwide astronomical community.
Free Keywords:stars: formation; stars: protostars; techniques: photometric; ISM: individual objects: G011.11-0.12
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010A%26A...518L..95... [ID No:1]
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