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  • ASTROPHYSICS  (5)
  • 1975-1979  (5)
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  • ASTROPHYSICS  (5)
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Year
  • 1
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    Radio detection of interstellar sulfur dioxide (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Interstellar sulfur dioxide (SO2) has been detected in emission from the direction of the Orion Nebula molecular cloud and from Sgr B2. SO2 is the heaviest interstellar molecule detected to date, and the only nonlinear triatomic molecule which does not contain hydrogen. The remarkable Orion emission profiles suggest that two components are supporting the SO2 emission: a dense circumstellar-type envelope, which may be in maser emission, and a warm galactic cloud component.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 198; June 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Constraints on the molecular properties of interstellar X-ogen derived from radio observations (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Twenty-eight X-ogen emission sources at 89.189 GHz have been detected and observed. Twenty of these are new X-ogen sources which also contain other interstellar molecules. No infrared stars are found to be X-ogen sources. A new rest frequency (89,188.65 MHz) is derived for X-ogen. It is shown that X-ogen is not SiC, C2H, or any molecule with spin-doubling, hyperfine structure, or both.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 200; Sept. 15
    Format: text
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  • 3
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    The quadrupole coupling constant of HNC (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The letter reports resolved measurements of the quadrupole hyperfine structure of HNC (hydrogen isocyanide). These measurements were made in the direction of the cool interstellar dust cloud L134, and were used to make an experimental determination of a fundamental spectroscopic constant of HNC, its quadrupole coupling constant.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 215
    Format: text
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  • 4
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    Radio detection of interstellar DCO/+/ (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The J = 1-0 transition of the deuterated formyl ion, DCO(+), has been detected in emission from NGC 2264 and DR 21(OH) and from the cool dust cloud L134. Estimates for the column-density ratios of H(C-13)O(+) to DCO(+) are given for NGC 2264 and DR 21(OH); lower limits for the ratios are given for five other clouds. The DCO(+) detection in L134 provides unique observational evidence in support of chemical fractionation. The L134 results also suggest that the dust clouds may act as repositories for primordial deuterium.
    Keywords: ASTROPHYSICS
    Type: PB-282001 , Astrophysical Journal; 209; Oct. 15
    Format: text
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  • 5
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    Radio detection of interstellar N2D/+/ (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Line emission from the J = 1-0 transition of interstellar N2D(+) has been detected toward the cool dust cloud L134 N. The N2H(+)/N2D(+) total-projected-density ratio in this cloud is estimated to be about 2.22. Upper limits are obtained for the fractional ionization as well as the CO and N2 abundances in L134 N. The results are shown to support the previously discovered enhancement of the abundance of deuterated molecules in cool dust clouds.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 218
    Format: text
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