Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adil...dm...02m&link_type=abstract
NCSA Astronomy Digital Image Library
Astronomy and Astrophysics
Astronomy
Ism: Clouds, Ism: Individual Alphanumeric: Hh 7-11, Ism: Jets And Outflows, Ism: Molecules, Radio Lines: Ism
Scientific paper
In order to determine the location of extremely high velocity HCO+ emission in the HH 7-11 outflow, BIMA array observations of the J=1-0 transition with 11" by 8.9" angular resolution were carried out. Two spatially unresolved clumps with average velocities ~ 40 km/s blueward of the ambient material are detected. The two clumps are projected < 4" (1400 AU) and 25" (8800 AU) from SVS 13, the IR source which drives the outflow. EHV redshifted material is also observed, although it is not as easily separated from lower velocity material. No high velocity HCO+ emission is observed toward the HH objects. The position of high-velocity HCO+ emission relative to the exciting source in this region is similar to that observed in the L1551:IRS 5 outflow (Rudolph 1992). This similarity suggests that, as in the case of L1551:IRS 5, the high-velocity molecular material in the HH 7-11 outflow may have been entrained in the neutral atomic wind of SVS 13 as it passed through the surrounding cloud. In addition, lower velocity HCO+ J=1-0 emission traces a curved structure near HH 7, the most distant HH object from SVS 13. The symmetry axis of the curved structure is nearly coincident with the HH object outflow/jet axis, suggesting that the SVS 13 wind/jet is responsible for sweeping up molecular material which forms the curved structure.
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