Molecular hydrogen and excitation in the HH 1-2 system

Details Molecular hydrogen and excitation in the HH 1-2 system Molecular hydrogen and excitation in the HH 1-2 system

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1432n&link_type=abstract

The Astronomical Journal, vol. 108, no. 4, p. 1432-1436

Astronomy and Astrophysics

Astronomy

17

Emission Spectra, Herbig-Haro Objects, Hydrogen, Infrared Astronomy, Infrared Imagery, Infrared Spectra, Molecular Excitation, Molecular Gases, Near Infrared Radiation, Ammonia, Astronomical Models, Astronomical Spectroscopy, Fluorescence, H Alpha Line, Infrared Spectroscopy, Infrared Telescopes, Interstellar Matter, Shock Waves, Sulfur

Scientific paper

We present a series of molecular hydrogen images of the Herbig-Haro 1-2 system in the 1-0 S(1) transition at 2.121 microns, with a spatial resolution of approximately 2 sec. The distribution of H2 is then compared with that of the excitation, given by the (S II) 6717+6731 to H-alpha line ratio. We find that most optical condensations in the HH 1-2 system, including the VLA 1 jet, have H2 counterparts. H2 emission is detected in most low excitation knots, as expected for low velocity shocks (50 km/s less than), but also in high excitation regions, like in HH 1F and HH 2A min. For these latter objects, the H2 emission could be due to the interaction of the preionizing flux, produced by 150-200 km/s shocks, with the surrounding interstellar matter, i.e., fluorescence. The lack fluorescent lines in the ultraviolet (UV), however, suggest a different mechanism. H2 is detected at the tip of the VLA 1 jet, where the knot morphology suggests the presence of a second bow shock. H2 is detected also SE of HH 2E and SW of HH 1F, in regions with known NH3 emission.

Affiliated with

Also associated with

No associations

Rating

Molecular hydrogen and excitation in the HH 1-2 system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Molecular hydrogen and excitation in the HH 1-2 system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular hydrogen and excitation in the HH 1-2 system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1069855