A search for the ground state S/2/ line of molecular hydrogen in the Orion Nebula

Details A search for the ground state S/2/ line of molecular hydrogen in the Orion Nebula A search for the ground state S/2/ line of molecular hydrogen in the Orion Nebula

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..848y&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 848-850.

Astronomy and Astrophysics

Astrophysics

3

Emission Spectra, Ground State, Hydrogen, Infrared Spectra, Line Spectra, Molecular Rotation, Nebulae, Interstellar Gas, Propagation Velocity, Shock Wave Propagation, Vibrational Spectra

Scientific paper

The paper reports a search for the 12.3-micron S(2) rotational line of molecular hydrogen in the Orion Nebula. No line stronger than 0.0035 erg/s per sq cm/sr was observed at the location of the peak 2.12-micron S(1) vibrational line emission. If the observed vibrational lines are due to a shock propagating in a dense medium, the upper limit implies a shock velocity greater than about 5 km/s in the absence of extinction, or 10 km/s with a visual extinction of 30 mag.

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