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  • Other Sources  (4)
  • 1975-1979  (4)
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  • 1
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    Unknown
    CO, CS, and HCN in a clustering of reflection nebulae in Monoceros (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations are reported of the 2.6-mm line of CO from an extended region in Monoceros containing a complex of dust clouds as well as a group of reflection nebulae (Mon R2) and where a source of relatively strong millimeter emission from CS and HCN has been found. Lower limits are obtained for the CO and H2 column densities in this region, and five CO emission peaks are identified, each of which is approximately coincident with at least one reflection nebula. Around the position of the strongest peak, extended emission is observed from CS and HCN, suggesting the existence of a rotating core with an H2 density which corresponds to a mass of 5500 solar masses. The CO profiles in the direction of the strongest peak appear to show self-absorption, which may indicate a collapsing cloud.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 199; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    The molecular complexes in Orion (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Line emission from CO at 2.6 mm is observed over an area of 28 square degrees in the Orion region. Most of the emission comes from two giant molecular complexes, roughly associated with Ori B and Ori A. The latter provides the best example of a giant molecular complex at the end of a sequence of OB association subgroups of decreasing age. This complex is apparently rotating with an angular velocity 4.5 by 10 to the -15th power per sec, but in a direction opposed to the Galactic rotation. The apparently denser parts of the cloud are rotating at a somewhat greater angular velocity. The total mass of the molecular gas derived from the observations is 200,000 solar masses, implying that roughly half the matter in this region is in the form of molecular hydrogen.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 215
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    The relation between carbon monoxide emission and visual extinction in cloud L134 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Emission from the J = 1-0 transition of carbon monoxide has been mapped over an area of 40 by 55 arcmin in cloud L134, and visual extinctions over the entire cloud have been obtained by means of star counts. Line intensities of at least 2 K are observable down to an extinction level of about one magnitude. From observations of the J = 1-0 transition of the (C-13)O isotopic species at 18 locations in the cloud, a linear correlation is found between the local thermodynamic equilibrium (LTE) column densities of (C-13)O and magnitudes of visual extinction.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 210; Dec. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    A dense molecular cloud in the OMC-1/OMC-2 region (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: H2CO emission at 2 mm is seen over a region 30 arcmin in extent which includes OMC-1 and OMC-2. The mass of this cloud, estimated from H2CO and CO observations, is about 7000 solar masses. The velocity pattern is one of rotation, with evidence for fragmentation into two or three distinct condensations. A sharp boundary to the molecular cloud is observed at the edge of the H II region in NGC 1977. It appears likely that NGC 1977 is a condensation at the northern end of the cloud, complementary to the Orion Nebula at the southern end.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 209; Oct. 15
    Format: text
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    NASA TECHNICAL REPORTS
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