English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Integral-field spectroscopy of molecular hydrogen in the optical wavelengthregion and complementary long-slit near-infrared spectroscopy are presentedtowards HH91A.The detection of some 200 H_2 lines arising from ro-vibrationallevels up to v'=8 ranging between 7700A and 2.3 microns is reported. Theemission arises from thermally excited gas where the bulk of the material is at2750 K and where 1% is at 6000 K. The total column density of shocked gas isN(H_2) = 10^{18} cm^{-2}. Non-thermal excitation scenarios such asUV-fluorescence do not contribute to the excitation of H_2 towards HH91A. Theemission is explained in terms of a slow non-dissociative J-shock whichpropagates into a low-density medium which has been swept-up by previousepisodes of outflows which have occurred in the evolved HH90/91 complex.

Quantitative optical and near-infrared spectroscopy of molecular hydrogen towards HH91A