Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...504..359g&link_type=abstract
Astrophysical Journal v.504, p.359
Astronomy and Astrophysics
Astronomy
28
Infrared: Stars, Ism: H Ii Regions, Ism: Individual Name: Cepheus A East, Ism: Molecules, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
New infrared images of Cep A East are presented that show two regions of shock-excited line emission from separate bipolar flows. We identify the dominant sources powering the outflows and argue that the results support a multiple outflow model (Narayanan & Walker) as opposed to a quadrupolar outflow scenario. The images include near-infrared broadband (K [2.158 mu m], L" [3.81 mu m], and M' [4.67 mu m]) and spectral line ([Fe II] emission line at 1.644 mu m and H2 1-0 S[1] line at 2.122 mu m) observations, as well as continuum emission, at 1.644 mu m and 2.122 mu m. Considering our data and other results, we present a unified, self-consistent picture of the disk and shock structure. The northern emission region appears to be the result of the ablation of a dense molecular clump (coincident with HW 6) in the path of a diverting jet from YSO HW 2 and subsequent multiple bow shocks with prompt entrainment arising from the interaction of the jet with the molecular cloud Cep A-2. The southern line emission region near HW 7 resembles the "artillery shell" bow shocks found in Orion and is most likely a J-type shock caused by a jet from another YSO, possibly HW 3(d)ii.
Fischer Jan
Forrest William John
Goetz Jennifer A.
Greenhouse Matthew A.
Hughes V. A.
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