Hopkins Ultraviolet Telescope Observations of H 2 Emission from HH 2

Details Hopkins Ultraviolet Telescope Observations of H 2 Emission from HH 2 Hopkins Ultraviolet Telescope Observations of H 2 Emission from HH 2

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...489..314r&link_type=abstract

Astrophysical Journal v.489, p.314

Astronomy and Astrophysics

Astronomy

29

Molecular Processes, Shock Waves, Stars: Pre-Main-Sequence, Ultraviolet: Stars

Scientific paper

The Hopkins Ultraviolet Telescope spectrum of HH 2 shows Lyman band emission below 1200 Angstroms, and it reveals H2 bands in the quasi-continuum at longer wavelengths. The H2 emission could arise either from Ly alpha fluorescence (as in other HH objects) or from collisional excitation by hot electrons. The fluorescence hypothesis encounters some difficulty in explaining the lack of individual strong features, while the collisional hypothesis must explain the mixing of hot electrons into the molecular gas before photoionization or collisions with H atoms dissociate the molecules. The spectrum also provides a stringent upper limit to the O VI flux. The upper limit appears to conflict badly with the predictions of bow-shock models that match the observed line widths of HH 2A' and HH 2H.

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