Observations of interstellar silicon monoxide

Details Observations of interstellar silicon monoxide Observations of interstellar silicon monoxide

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206...79d&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 79-84.

Astronomy and Astrophysics

Astronomy

34

Electron Transitions, Interstellar Matter, Molecular Energy Levels, Nebulae, Radio Astronomy, Silicon Oxides, Abundance, Data Reduction, Gas Density, Ground State, Hydrogen, Molecular Excitation, Radiative Transfer

Scientific paper

The paper reports observations of rotational transitions of SiO in the ground vibrational state at 86.8 GHz (J = 2 - 1) and 130.3 GHz (J = 3 - 2). At 86.8 GHz, SiO emission in Orion A peaks in the direction of the Kleinmann-Low nebula. A possible secondary maximum occurs about 80 arcsec southward. The 130.3-GHz line was also detected in Orion A. Mapping of the 86.8-GHz line in Sgr B2 shows the presence of two velocity components and a north-south extent of about 4 arcmin. Comparison of the data with radiative-transfer calculations implies that if the hydrogen density is approximately 100,000 per cu cm, then the SiO column density is approximately 10 to the 15th power per sq cm for Orion A at 60 K. Upper limits to the total HO2 column density in Orion A and Sgr B2 are reported.

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