Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..469s&link_type=abstract
Astronomical Journal, vol. 88, Mar. 1983, p. 469-475.
Astronomy and Astrophysics
Astronomy
2
Astronomical Spectroscopy, Emission Spectra, Hydrogen Clouds, Molecular Clouds, Orion Nebula, Absorption Spectra, Hydroxyl Emission, Spectral Line Width, Water Masers
Scientific paper
Fourteen lines of the v = 1-0 and v = 2-1 2 micron H2 quadrupole spectrum were measured in a series of ground-based spectroscopic observations of four locations within the Orion molecular cloud-H2 emission complex. Beam sizes of 7 and 10 arcsec were used, with a resolution of 1.8/cm. The results indicate that there are differences in the extinction between regions of as much as 20 mag. In particular there appears to be a ridge of material near the object IRS 2 (= IRc 9), a previously suggested source of activity. The 2-1 S (3) line intensity is substantially stronger at Peak 2 than the present models predict, and this observation is the first indication that there may be a non-Boltzmann distribution within the vibrational levels of shock-excited H2. A detection of the 1-0 Q (6) line is also reported, a feature which was previously absent in spectra of the Orion cloud.
Feierberg M. A.
Fink Uwe
Larson Harold P.
Smith Harold A.
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