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Paper: On-the-Fly Mapping of Giant Molecular Outflows
Volume: 217, Imaging at Radio Through Submillimeter Wavelengths
Page: 86
Authors: Arce, H. G.; Goodman, A. A.
Abstract: Using the on-the-fly (OTF) mapping technique with the NRAO 12m telescope, we have observed a great extent of the molecular gas surrounding two giant Herbig-Haro flows. Most conventional molecular outflow studies are constrained to the immediate vicinity of the molecular outflow lobe and do not study the overall cloud gas around it. We used the advantages of the OTF technique in order to observe the molecular outflows and a large extent of their surrounding molecular gas, using the CO (2-1) line, with high resolution and signal to noise, in a relatively small amount of time. The map of the the giant HH flow HH 315, driven by the star PV Cephei (at an assumed distance of 500 pc) is 2 pc wide (in the direction perpendicular to the flow axis) by 3.6 pc long (in the direction parallel to the flow axis). The OTF map of the HH 300 outflow, driven by the star IRAS 04239+2436 in Taurus (at a distance of 140 pc), only includes the redshifted lobe, and it is 0.4 pc wide by 1.5 pc long. By observing a bigger area than what is usually observed of the molecular gas surrounding the HH flow with high sensitivity, we are able to study: 1) the overall effects the HH flows have on the surrounding gas (e.g., energy and momentum deposition on the cloud by the HH jet); 2) the relation between optical jet and molecular outflow, in particular the entrainment mechanism; and 3) the role of HH flows in the creation of turbulence in their clouds. Preliminary results are shown.
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