Discovery of extraordinarily high-J OH in the HH 211 outflow

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Ism: Herbig-Haro Objects, Ism: Individual (Hh 211), Ism: Jets And Outflows, Ism: Molecules, Shock Waves

Scientific paper

We present a 5-37 micron infrared spectrum toward the southeastern lobe of the young protostellar outflow HH 211 obtained with the Spitzer Space Telescope. The spectrum shows an exceptionally rich sequence of highly rotationally excited OH (v=0) emission. The highest excited rotational level has an energy E/k≈ 28000 K above the ground level, which is, to our knowledge, by far the highest observed electronic ground-state excitation of OH in any astrophysical environment to date. In addition, we observe several pure rotational water\ (v=0) transitions, H_2 (v=0) S(0) to S(7), HD (v=0) R(3) to R(6), and atomic fine-structure lines from Fe^+, Si^+, S, and Cl.

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