The physical conditions in the BHR71 outflows |
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| Authors: | Bérengère Parise Arnaud Belloche Silvia Leurini Peter Schilke |
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| Institution: | (1) MPIfR, Auf dem Hügel 69, 53121 Bonn, Germany;(2) ESO, Karl Schwarzschild Str. 2, 85748 Garching bei München, Germany |
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| Abstract: | Highly-collimated outflows are believed to be the earliest stage in outflow evolution, so their study is essential for understanding
the processes driving outflows. The BHR71 Bok globule is known to harbour such a highly-collimated outflow, which is powered
by a protostar belonging to a protobinary system. Using the APEX telescope on Chajnantor, we mapped the BHR71 highly-collimated
outflow in CO(3-2), and observed several bright points of the outflow in the molecular transitions CO(4-3), CO(7-6), 13CO(3-2), C18O(3-2), CH3OH(7-6) and H2CO(4-3). We use an LVG code to characterise the temperature enhancements in these regions. These observations are particularly
interesting for investigating the interaction of collimated outflows with the ambient molecular cloud. In our CO(3-2) map,
the second outflow driven by IRS2, which is the second source of the binary system, is completely revealed and shown to be
bipolar. We also measure temperature enhancements in the lobes. The CO and methanol LVG modelling points to temperatures between
30 and 50 K in the two lobes. The methanol emission in the southern lobe bright knot is barely resolved with the APEX single-dish.
ALMA will thus be a central tool to study the shock chemistry in these regions. |
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| Keywords: | Astrochemistry Molecular data Stars: formation ISM: jets and outflows Submillimeter |
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