Journal ArticleDOI
The Detection of Protostellar Condensations in Infrared Dark Cloud Cores
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In this paper, high angular resolution millimeter continuum images were obtained with the IRAM Plateau de Bure Interferometer toward four high-mass (200-1800 M?) IRDC cores that show evidence for active high mass star formation (M > 8 M?).Abstract:
Infrared dark clouds (IRDCs) are a distinct class of interstellar molecular cloud identified as dark extinction features against the bright mid-infrared Galactic background. Here we present high angular resolution millimeter continuum images obtained with the IRAM Plateau de Bure Interferometer toward four high-mass (200-1800 M?) IRDC cores that show evidence for active high-mass star formation (M > 8 M?). We detect twelve bright (>7 mJy), compact (2'', 0.024 pc) condensations toward these cores. Two of the cores (G024.60+00.08 MM1 and G024.60+00.08 MM2) are resolved into multiple protostellar condensations, while one core (G022.35+00.41 MM1) shows two condensations. The remaining core (G024.33+00.11 MM1) contains a single, compact protostellar condensation with a very rich molecular spectrum, indicating that this is a hot molecular core associated with an early stage in the formation of a high-mass protostar. The derived gas masses for these condensations suggest that each core is forming at least one high-mass protostar (Mgas > 8 M?), and three cores are also forming lower mass protostars (Mgas ~ 2-5 M?). A comparison of the ratios of the gas masses (MG) to the Jeans masses (MJ) for IRDCs, cores, and condensations, provides broad support for the idea of hierarchical fragmentation. The close proximity of multiple protostars of disparate mass indicates that these IRDCs are in the earliest evolutionary states in the formation of stellar clusters.read more
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Journal ArticleDOI
Infrared dark clouds: precursors to star clusters
TL;DR: In this article, the authors found that IRDCs represent an earlier evolutionary phase in high-mass star formation and that they contain many compact cores and have the same sizes and masses as molecular clumps associated with young clusters, supporting the idea that all stars may form in such clumps.
Journal ArticleDOI
A Catalog of Extended Green Objects in the GLIMPSE Survey: A New Sample of Massive Young Stellar Object Outflow Candidates
Claudia Cyganowski,B. A. Whitney,E. Holden,Ella K. Braden,Crystal L. Brogan,Ed Churchwell,Remy Indebetouw,D. F. Watson,Brian Babler,Robert A. Benjamin,Mercedes Gomez,Marilyn R. Meade,Matthew S. Povich,Thomas P. Robitaille,C. Watson +14 more
TL;DR: In this paper, a catalog of extended green objects (EGOs) is presented, including integrated flux density measurements at 3.6, 4.5, 5.8, 8.0, and 24 μm from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE).
Journal ArticleDOI
Evolution of Massive Protostars with High Accretion Rates
Takashi Hosokawa,Kazuyuki Omukai +1 more
TL;DR: In this paper, the authors studied the evolution of protostars accreting at such high rates by solving the structure of the central star and the inner accheting envelope simultaneously, and they also proposed that the central source enshrouded in the Orion KL/BN nebula has effective temperature and luminosity consistent with their model and is a possible candidate for growing under the high accretion rate.
Journal ArticleDOI
Global collapse of molecular clouds as a formation mechanism for the most massive stars
Nicolas Peretto,Gary A. Fuller,Ana Duarte-Cabral,Adam Avison,Patrick Hennebelle,Jaime E. Pineda,Ph. André,Sylvain Bontemps,Frédérique Motte,Nicola Schneider,Sergio Molinari +10 more
TL;DR: In this paper, the authors present a comprehensive dataset of the 5500(±800) M⊙ infrared dark cloud SDC335, which exhibits a network of cold, dense, parsec-long filaments.
Journal ArticleDOI
Filaments and ridges in Vela C revealed by Herschel: from low-mass to high-mass star-forming sites
T. Hill,Frédérique Motte,Pierre Didelon,Sylvain Bontemps,Vincent Minier,Martin Hennemann,Nicola Schneider,Philippe André,Alexander Men'shchikov,L. D. Anderson,Doris Arzoumanian,Jean-Philippe Bernard,James Di Francesco,Davide Elia,Teresa Giannini,Matthew Joseph Griffin,Jason M. Kirk,Vera Könyves,A. Marston,Peter G. Martin,Sergio Molinari,Quang Nguyen Luong,Nicolas Peretto,Stefano Pezzuto,Hélène Roussel,Marc Sauvage,Thierry Sousbie,Leonardo Testi,Derek Ward-Thompson,Glenn J. White,C. D. Wilson,C. D. Wilson,Annie Zavagno +32 more
TL;DR: In this paper, the first Herschel PACS and SPIRE results of the Vela C molecular complex in the far-infrared and submillimetre regimes at 70, 160, 250, 350, and 500 um, spanning the peak of emission of cold prestellar or protostellar cores were presented.
References
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Journal ArticleDOI
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TL;DR: In this paper, the uncertainty inherent in any observational estimate of the IMF is investigated by studying the scatter introduced by Poisson noise and the dynamical evolution of star clusters, and it is found that this apparent scatter reproduces quite well the observed scatter in power-law index determinations, thus defining the fundamental limit within which any true variation becomes undetectable.
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