Measurements of the extinction to the molecular hydrogen emission from the Orion Nebula

Details Measurements of the extinction to the molecular hydrogen emission from the Orion Nebula Measurements of the extinction to the molecular hydrogen emission from the Orion Nebula

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..436b&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 436-440.

Astronomy and Astrophysics

Astrophysics

53

H Lines, Infrared Spectra, Interstellar Extinction, Molecular Spectra, Nebulae, Hydrogen Clouds, Luminous Intensity, Molecular Oscillations, Molecular Rotation

Scientific paper

Observations of the reddening of two pairs of H2 emission lines in the Orion Nebula are presented. A reddening of 0.8 + or - 0.2 mag between 2.12 and 2.42 microns is derived from observations of the intensity ratio of the v = 1-0 S(1) (2.12-micron) line and the Q(3) (2.42-micron) line and a comparison of this ratio with its unreddened value. The result is checked by a measurement of the intensity ratio of the v = 1-0 S(2) (2.03-micron) line and the Q(4) (2.43-micron) line. The total IR and visual extinctions to the emission region are inferred to be 4 + or - 1 mag (2.1 microns) and 40 + or - 10 mag (visual). Previous measurements of the H2 emission lines in Orion are corrected on the basis of these results, yielding a total H2 luminosity of approximately 2000 suns, an average column density of about 3 x 10 to the 20th per sq cm, and essentially equal rotational and vibrational temperatures (2000 K) for the H2. It is concluded that the H2 emission region in Orion lies within the molecular cloud, probably at the same depth as the IR cluster.

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