Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0610d&link_type=abstract
American Astronomical Society, AAS Meeting #212, #6.10; Bulletin of the American Astronomical Society, Vol. 40, p.197
Astronomy and Astrophysics
Astronomy
Scientific paper
Infrared dark clouds (IRDCs) are molecular/dust clouds seen in silhouette against mid-infrared 8μm Galactic background emission, and are believed to harbor early observable phases of massive star formation. We present Very Large Array spectral line observations of NH3(1,1), NH3(2,2), and CCS(21-10) transitions toward four IRDCs. In all of the IRDCs, evidence of multiple velocity components and/or outflows is found in the NH3 spectral line profiles. The temperature and density structure, the relative distribution of CCS and NH3, and evidence of star formation within the IRDCs are presented. We also discuss the NH3 gas kinematics of the IRDCs and the relationship between kinematics, physical and chemical properties, and star formation within IRDCs. K. Devine was supported by an NRAO pre-doctoral fellowship for much of this work. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Additional support was provided by NSF grant 0303698 and NSF contract 1275394.
Brogan Crystal
Chandler Catherine
Churchwell Edward
Devine Kathryn E.
Indebetouw Remy
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