Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558..204r&link_type=abstract
The Astrophysical Journal, Volume 558, Issue 1, pp. 204-215.
Astronomy and Astrophysics
Astronomy
8
Ism: Individual (Hh 7-11), Ism: Herbig-Haro Objects, Ism: Jets And Outflows, Ism: Molecules, Stars: Formation
Scientific paper
Observations of the HH 7-11 outflow were carried out in multiple lines of CS and NH3 in order to trace the structure of the outflow and its interaction with the surrounding medium. The lower-J CS observations show evidence for a low-velocity (few km s-1) CS bipolar flow in the same sense as the CO outflow. A dense (>~106 cm-3) CS and NH3 ridge perpendicular to the outflow is seen around SVS 13 (the driving source of the outflow), VLA 3 (a recently detected 6 cm source), and SVS 13B (a class 0 protostar that is placed ~15" southwest of SVS 13-see the 1998 work by Bachiller and colleagues). The CS observations at ambient velocities clearly show an evacuated cavity to the southeast of SVS 13, surrounding HH 10 and 11, and ending at a wide ridge of gas just downwind of HH 8. The NH3 observations show evidence of gas heated to temperatures >~40 K in at least three distinct regions: in the vicinity of SVS 13 and VLA 3, just downwind of HH 8, and near SVS 13B. In the case of the circumstellar material, either heating by the embedded star(s) or shock heating from wind-cloud interactions could be responsible; the gas downwind of HH 8 is either directly shock heated or is radiatively heated by the shock traced by HH 8.
Bachiller Rafael
Palmer Patrick
Quang Rieu Nguyen
Rudolph Alexander L.
van Trung Dinh
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