Mathematics – Logic
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1481f&link_type=abstract
ATNF proposal M316, Semester: April, 2008
Mathematics
Logic
Galactic, Mopra
Scientific paper
Infrared Dark Clouds (IRDCs) are cold, dense molecular clouds seen as extinction features against the bright Galactic background. Kinematic distances to IRDCs in the first and fourth Galactic quadrants were found using two different methods. In the first quadrant, distances were found by morphological matching of 13CO emission to the mid-IR extinction, but in the fourth quadrant distances were found by measuring CS line velocities. The distributions of IRDCs in the first and fourth quadrants differ significantly. The first quadrant IRDC distribution shows a puzzling enhancement close to the Sun that is absent in the fourth quadrant. This difference could be due to a real Galactic feature, or could be due to misidentifications of IRDCs in the first quadrant due to the use of 13CO to find IRDC distances. CS (2-1) has a high critical density and therefore unambiguously traces dense IRDCs. Therefore, we wish to observe the 313 first quadrant IRDCs in this spectral line to determine the true Galactic distribution of IRDCs.
Battersby Cara
Chambers Edward
Finn Susanna
Jackson James
Stojimirovic Irena
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