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/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

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

Zendy Tools

Zendy Open

We report on spectro-imaging observations of the Herbig-Haro 2 outflow withthe ISOCAM camera onboard the Infrared Space Observatory (ISO). The [Ne II}]12.81 microns and [Ne III]15.55 microns lines are detected only towards the jetworking surface (HH 2H), consistent with the high excitation of this knot inthe optical range, while H2 pure rotational emission is found all over theshocked region HH 2. The low energy transition S(2) traces warm gas (T approx.400K) peaked towards knots E-F and extended ejecta (T approx. 250-380) withmasses of a few 0.001 solar mass in the high-velocity CO outflow extendingbetween the powering source and HH 2. Such emission could arise fromlow-velocity C-type shocks (v= 10-15 km/s). The higher transitions S(3)-S(7)trace the emission of hot shocked gas (T= 1000-1400K) from individual opticalknots in the HH 2 region. The ortho to para (OTP) ratio exhibits large spatialvariations between 1.2 (E) and 2.5 (H), well below its value at LTE. Theemission of the S(3)-S(7) lines is well accounted for by planar C-shock modelswith a typical velocity V= 20-30 km/s propagating into a medium of density10^4-10^5 cm-3 with an initial OTP ratio close to 1 in the pre-shock gas. Inthe leading edge of the jet, where the geometry of the emission allows a simplemodelling, a good agreement is found with velocities derived from the opticalproper motions measured in the ionized gas.Comment: 10 pages + 1 figur

Warm Molecular Hydrogen and Ionized Neon in the HH 2 Outflow