Publication Abstracts

Kutner 1972

Kutner, M.L., 1972: Interstellar Formaldehyde and Silicon Monoxide in Ultra-Dense Clouds. Ph.D. thesis. Columbia University.

The first part of this dissertation reports the discovery of the 140.8-GHz, 111-212 and 150.5-GHz 11-211 rotational transitions of ortho-formaldehyde and 146.6-GHz 101-202 transition of para-formaldehyde in the Orion Nebula. All lines were observed in emission. The 140.8GHz line was mapped over a region ~3'×5' in the direction of the Kleinmann-Low IR nebula. It is argued that the excitation is due to collisions with neutral particles, whose density is calculated to be ~2×105 cm-3, yielding a total mass of ~200 M for the Kleinmann-Low nebula which is argued to be the central condensation of this cloud. The 140.8-GHz line was also detected in the direction of Sgr A, W3 (OH), W51, DR21 (OH) and NGC 2024.

The detection of weak 6-cm H2CO absorption over much of the Orion Nebula is also reported. Because the line shows no correlation with the 6-cm continuum, it is attributed to "anomalous" absorption by H2CO behind the HII continuum source. In the direction of the Kleinmann-Low IR nebula the line appears self-reversed, with an emission core of about 0.1 K that is identified with the 2-mm H2CO emission in that direction. It is suggested that the 6-cm emission is a consequence of collissional quenching of the "anomalous" pumping mechanism.

The last section of this dissertation reports the detection of lime emission attributed to 130.246-GHz, J = 3→2 rotational transition of silicon monoxide (SiO) in the direction of the Sgr B2. The line was sought but not found in a number of other sources.

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BibTeX Citation

@phdthesis{ku06000k,
  author={Kutner, M. L.},
  title={Interstellar Formaldehyde and Silicon Monoxide in Ultra-Dense Clouds},
  year={1972},
  school={Columbia University},
  address={New York, N.Y.},
}

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RIS Citation

TY  - THES
ID  - ku06000k
AU  - Kutner, M. L.
PY  - 1972
BT  - Interstellar Formaldehyde and Silicon Monoxide in Ultra-Dense Clouds
PB  - Columbia University
CY  - New York, N.Y.
ER  -

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