2.1 micron H2 emission - High-spectral-resolution observations of the Orion Nebula

Details 2.1 micron H2 emission - High-spectral-resolution observations of the Orion Nebula 2.1 micron H2 emission - High-spectral-resolution observations of the Orion Nebula

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219l..29j&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 219, Jan. 1, 1978, p. L29-L31.

Astronomy and Astrophysics

Astrophysics

13

Astronomical Spectroscopy, Emission Spectra, Hydrogen Clouds, Infrared Spectra, Near Infrared Radiation, Nebulae, H Lines, High Resolution, Propagation Velocity, Shock Heating, Spectral Resolution

Scientific paper

High-resolution (45 km/sec) observations of the 2.12 micrometers molecular hydrogen emission line in the Orion Nebula reveal a single feature with delta V (FWHP) not exceeding 30 km/sec at a LSR velocity of + 9.5 + or - 4 km/sec. The results support the suggestion that the H2 emission is collisionally excited in a thin shock-heated layer inside the cool molecular cloud. For a spherical geometry the shock velocity is, therefore, constrained to be at most 15 km/sec.

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