Other
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1456v&link_type=abstract
ATNF proposal M311, Semester: April, 2008
Other
Galactic, Mopra
Scientific paper
Infrared Dark Clouds (IRDCs) are considered to be ideal sites for the very early stages of massive star formation. However, the gas properties for larger samples of IRDCs are still marginally explored to date, especially for objects in the southern hemisphere. We propose to observe 15 southern IRDCs with Mopra from 85.2 - 93.5 GHz. At these frequencies we will be able to observe molecular lines (N2H+, HCO+(1-0), H^13CO+(1-0), SiO and others) which are good tracers of cold dense gas, appropriate for early stages of massive star formation. With the molecular line information directly from the IRDCs, estimation of kinematic distances for our targets is possible for the first time. We want to map our targets to reveal the inventory of these clouds. With the tracers we can find molecular outflows and characterise the dynamical properties of the dense gas. Hence, the star formation activity can be assessed, also in combination with Spitzer IR data and our 1.2mm data. We will look for substructures in different evolutionary stages, together with subsequent chemical modelling. We will investigate if starless massive cores can be found at all which then might reflect the initial conditions.
Beuther Henrik
Henning Thomas
Linz Hendrik
Stecklum Bringfried
Vasyunina Tatiana
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