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Wednesday 7 April at 2pm @ JAC
Russell Redman - CNRC
"Bipolar Outflows from YSOs in MSX IRDCs"
ABSTRACT: "Infrared-Dark Clouds are found in absorption in the mid-IR against
background emission from the Galactic Plane. Almost by definition, they do
not contain hot dust and fully developed H II regions. Indeed, many of them
appear to be quiescent, free of any current star-formation. Closer
examination, however, shows that some of them contain moderate-mass YSOs,
suggesting that they may also contain populations of low-mass YSOs. This
hypothesis has been difficult to evaluate. Most IRDCs are quite distant,
making low-mass YSOs difficult to detect. Worse, the IRDCs are embedded in
the Plane, so the best molecular tracers of star formation are confused by
unrelated emission on the line-of-sight. Recently, we have been using the
JCMT and the BIMA interferometer to search for SiO emission, whose molecular
abundance is enhanced by factors of 10^5 - 10^6 in the strong shocks that
accompany bipolar outflows. I will present some of the early results of
this program, which has detected bipolar outflows in roughly half of the
dense IRDC cores that we have examined to date."
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