HOT MOLECULAR CORES IN INFRARED DARK CLOUDS

2011 ◽  
Vol 741 (2) ◽  
pp. 120 ◽  
Author(s):  
J. M. Rathborne ◽  
G. Garay ◽  
J. M. Jackson ◽  
S. Longmore ◽  
Q. Zhang ◽  
...  
Keyword(s):  
Dark Clouds ◽  
Infrared Dark Clouds

SiO as a chemical signature of outflows from bright, compact sources in MSX IR-dark clouds

2004 ◽  
Vol 82 (6) ◽  
pp. 740-743 ◽  
Author(s):  
P A Feldman ◽  
R O Redman ◽  
L W Avery ◽  
J Di Francesco ◽  
J D Fiege ◽  
...  
Keyword(s):  
Star Formation ◽  
Young Stellar Objects ◽  
Line Profiles ◽  
Bipolar Outflows ◽  
Dark Cloud ◽  
Stellar Objects ◽  
Dark Clouds ◽  
Dense Cores ◽  
Infrared Dark Clouds ◽  
Compact Sources

The line profiles of dense cores in infrared-dark clouds indicate the presence of young stellar objects (YSOs), but the youth of the YSOs and the large distances to the clouds make it difficult to distinguish the outflows that normally accompany star formation from turbulence within the cloud. We report here the first unambiguous identification of a bipolar outflow from a young stellar object (YSO) in an infrared-dark cloud, using observations of SiO to distinguish the relatively small amounts of gas in the outflow from the rest of the ambient cloud. Key words: infrared-dark clouds, star formation, bipolar outflows, SiO, G81.56+0.10.

scholarly journals Fire from Ice - Massive Star Birth from Infrared Dark Clouds

2017 ◽  
Vol 13 (S332) ◽  
pp. 139-152
Author(s):  
Jonathan C. Tan
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Initial Conditions ◽  
Massive Star Formation ◽  
Dark Clouds ◽  
Complex Process ◽  
Infrared Dark Clouds

AbstractI review massive star formation in our Galaxy, focussing on initial conditions in Infrared Dark Clouds (IRDCs), including the search for massive pre-stellar cores (PSCs), and modeling of later stages of massive protostars, i.e., hot molecular cores (HMCs). I highlight how developments in astrochemistry, coupled with rapidly improving theoretical/computational and observational capabilities are helping to improve our understanding of the complex process of massive star formation.

scholarly journals Physical properties of Southern infrared dark clouds

2009 ◽  
Vol 499 (1) ◽  
pp. 149-161 ◽  
Author(s):  
T. Vasyunina ◽  
H. Linz ◽  
Th. Henning ◽  
B. Stecklum ◽  
S. Klose ◽  
...  
Keyword(s):  
Physical Properties ◽  
Dark Clouds ◽  
Infrared Dark Clouds

scholarly journals Molecular Line Observations of Infrared Dark Clouds: Seeking the Precursors to Intermediate and Massive Star Formation

2006 ◽  
Vol 166 (2) ◽  
pp. 567-584 ◽  
Author(s):  
S. E. Ragan ◽  
E. A. Bergin ◽  
R. Plume ◽  
D. L. Gibson ◽  
D. J. Wilner ◽  
...  
Keyword(s):  
Star Formation ◽  
Massive Star ◽  
Massive Star Formation ◽  
Molecular Line ◽  
Dark Clouds ◽  
Infrared Dark Clouds

scholarly journals Are infrared dark clouds really quiescent?

2016 ◽  
Vol 592 ◽  
pp. A21 ◽  
Author(s):  
S. Feng ◽  
H. Beuther ◽  
Q. Zhang ◽  
Th. Henning ◽  
H. Linz ◽  
...  
Keyword(s):  
Dark Clouds ◽  
Infrared Dark Clouds

scholarly journals DISTRIBUTION AND CHARACTERISTICS OF INFRARED DARK CLOUDS USING GENETIC FORWARD MODELLING

2009 ◽  
Vol 706 (1) ◽  
pp. 727-737 ◽  
Author(s):  
D. J. Marshall ◽  
G. Joncas ◽  
A. P. Jones
Keyword(s):  
Forward Modelling ◽  
Dark Clouds ◽  
Infrared Dark Clouds

scholarly journals Massive and low-mass protostars in massive “starless” cores

2019 ◽  
Vol 622 ◽  
pp. A54 ◽  
Author(s):  
Thushara Pillai ◽  
Jens Kauffmann ◽  
Qizhou Zhang ◽  
Patricio Sanhueza ◽  
Silvia Leurini ◽  
...  
Keyword(s):  
Star Formation ◽  
Detection Limit ◽  
High Mass ◽  
Mass Star ◽  
Core Mass ◽  
Filamentary Structure ◽  
Dark Clouds ◽  
Low Mass ◽  
Infrared Dark Clouds ◽  
Dense Clump

The infrared dark clouds (IRDCs) G11.11−0.12 and G28.34+0.06 are two of the best-studied IRDCs in our Galaxy. These two clouds host clumps at different stages of evolution, including a massive dense clump in both clouds that is dark even at 70 and 100 μm. Such seemingly quiescent massive dense clumps have been speculated to harbor cores that are precursors of high-mass stars and clusters. We observed these two “prestellar” regions at 1 mm with the Submillimeter Array (SMA) with the aim of characterizing the nature of such cores. We show that the clumps fragment into several low- to high-mass cores within the filamentary structure of the enveloping cloud. However, while the overall physical properties of the clump may indicate a starless phase, we find that both regions host multiple outflows. The most massive core though 70 μm dark in both clumps is clearly associated with compact outflows. Such low-luminosity, massive cores are potentially the earliest stage in the evolution of a massive protostar. We also identify several outflow features distributed in the large environment around the most massive core. We infer that these outflows are being powered by young, low-mass protostars whose core mass is below our detection limit. These findings suggest that low-mass protostars have already formed or are coevally formed at the earliest phase of high-mass star formation.

scholarly journals Isolated starless cores in infrared dark clouds in the Hi-GAL survey

2012 ◽  
Vol 424 (1) ◽  
pp. 716-727 ◽  
Author(s):  
L. A. Wilcock ◽  
D. Ward-Thompson ◽  
J. M. Kirk ◽  
D. Stamatellos ◽  
A. Whitworth ◽  
...  
Keyword(s):  
Dark Clouds ◽  
Infrared Dark Clouds
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