Near-infrared spectroscopy and imaging of Herbig-Haro objects

Details Near-infrared spectroscopy and imaging of Herbig-Haro objects Near-infrared spectroscopy and imaging of Herbig-Haro objects

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..580g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. 580-592

Astronomy and Astrophysics

Astronomy

105

Herbig-Haro Objects, Hydrogen, Infrared Astronomy, Iron, Jet Flow, Line Spectra, Molecular Excitation, Near Infrared Radiation, Shock Waves, Infrared Imagery, Infrared Spectroscopy, Interstellar Matter, Morphology, Reflecting Telescopes, Spectrographs

Scientific paper

The results of a near-infrared study of the Herbig-Haro objects HH 43, HH 54, HH 56, HH 99A, HH 106, and HH 120 are presented. The H- and K-band spectra show molecular hydrogen emission that arises from vibrational levels v prime less than or equal to 3. The inferred population distribution is thermal in all objects, and can be well described by single excitation temperatures ranging from 2000-2700 K. Non-thermal excitation scenarios, such as fluorescence or H2 formation in excited levels, or excitations in a UV or X-ray heated gas, are not observed. Emission from (FeII) is present towards all objects. Near-infrared images were obtained towards HH 43, HH 54, and HH 120. The morphology of the H2 and (FeII) emission is similar on large scales but differs in the detail. The H2 and (FeII) observations are difficult to reconcile with the predictions of C-type shock models. They indicate the presence of multiple, or curved J-shocks, where (FeII) arises in the faster, dissociative sections, and where H2 arises in the slow, non-dissociative parts of the shocks.

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