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  • Other Sources  (16)
  • 1975-1979  (16)
Collection
Source
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Years
Year
  • 1
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    Evidence for a variable far-infrared source in NGC 6334 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: NGC 6334 has been mapped with a 40-250 micron photometer with 1 arcmin resolution. Six sources of far-infrared radiation have been detected. The second-strongest source was not detected in an earlier (2.7 years) 40-350 micron survey of the same region. This source is interpreted as a variable far-infrared source. The new source, located at the position of OH and H2O maser sources, is extended (0.7 arcmin FWHM) and has a bolometric luminosity of 190,000 solar luminosities and may represent a hitherto unobserved transient stage of protostellar collapse.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 232
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Millimetre and submillimetre measurements of the Crab Nebula (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The flux from the central region of the Crab Nebula in three broad spectral passbounds with flux-weighted mean wavelengths of 300 microns, 400 microns and 1 mm has been measured. The inferred total flux densities for the entire nebula are consistent with an extrapolation of the power law spectrum found at longer wavelengths. Derivations of various flux densities are presented, and it is concluded that the luminosity of dust emission from the Crab Nebula varies between 1300 and 5000 suns as the temperature varies from 40 to 120 K, respectively.
    Keywords: ASTRONOMY
    Type: Nature; 279; June 21
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A comparison of high resolution radio and far-infrared maps of M 17 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New 3.5-cm radio and 69-micron far-infrared maps of M17, both made with an angular resolution of about 1.5 arcmin, are presented. Each map has three distinct maxima. Two of the maxima on the far-IR map agree in position with the corresponding maxima on the radio map. However, the positions of the brightest peak in the radio and far-infrared maps, located in the SW part of M17, differ by 4.6 + or - 2.2 s in right ascension and +44 + or - 20 sec in declination, with the far-infrared peak lying between the radio peak and the dense molecular cloud southwest of the H II region. It is believed that the positional offset of the radio and far-infrared peak is physically significant. The origin of the far-infrared radiation appears to be thermal emission from dust at the interface of the ionized gas and molecular cloud. This interface region is probably heated by radiation from the H II region.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics; 76; 1, Ju; June 197
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    NASA TECHNICAL REPORTS
  • 4
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    Discovery of a compact far-infrared source, IR 12.4+0.5 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are reported for far-IR, CO, 8-GHz, 15-GHz, H2O, and near-IR observations of a compact far-IR source (designated IR 12.4+0.5) in the M17 molecular cloud, as well as for CO and near-IR observations of a CO peak (designated MC 12.8+0.5) 24 arcmin to the NE of IR 12.4+0.5. The observed far-IR signal from IR 12.4+0.5 is found to correspond to a flux of 2400 Jy at 69 microns for a color temperature of 70 K, and the FWHM size of the source is estimated to be about 36 arcsec. The CO data for both sources and the observed reddening of background giants are shown to indicate high column densities; the existence of internal heat sources is inferred from the measured CO temperatures and the far-IR emission. It is concluded that the two sources are probably sites of very recent or ongoing star formation and that IR 12.4+0.5 is consistent with the 'cocoon star' model of early star formation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 228
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    NASA TECHNICAL REPORTS
  • 5
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    A high-resolution map of the W3 region at far-infrared wavelengths (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The area in the vicinity of the H II region W3 is mapped at an effective wavelength of 69 microns with high angular resolution (1 min) using the 102-cm balloon-borne telescope. The main continuum source, W3, shows a partially resolved complex structure with a FWHM size of 1.8 min. The radio sources W3(OH) and G133.8 + 1.4 are also observed as well as three faint sources not associated with known radio emission.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 199; Aug. 1
    Format: text
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  • 6
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    Rotationally excited HD toward Zeta Ophiuchi (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Copernicus satellite measurements of HD in J-double prime = 1 and J-double prime = 0 toward Zeta Oph are reported. The ratio of the number densities of HD in the J = 0 and J = 1 states is determined to be 0.15 + or - 0.02 at the 1-sigma level. A value of approximately 24 x 10 to the -17th erg/cu cm per A at 1000 A is obtained for the UV energy density at the Zeta Oph cloud, and the mechanisms for excitation of HD are examined. A tight upper limit is derived for the abundance of HCl, which has been predicted to be present due to the interaction of ionized chlorine with neutral hydrogen. A calculation is performed which indicates that the cloud is 28 pc from the star. It is shown that the two-component cloud model of Black and Dalgarno (1977) with densities of 500 and 2500 H nuclei per cu cm for the outer regions and core, respectively, is in excellent agreement with the observations.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 227
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Far-infrared observations of M20 /NGC 6514/ (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A far-infrared map of M20 shows a total flux of 26 kJy at an effective wavelength of 69 microns and a size of 8 arcmin FWHM. In the region near M20, two compact far-infrared sources were also detected; one source coincides with W28 C, and the other is not identified with any radio source.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 208; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A far-infrared map of the Ophiuchus dark cloud region (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An extensive area of the Ophiuchus dark cloud has been mapped at far-infrared (40-50 microns) wavelengths with high angular resolution (1 arcmin) using a 102-cm balloon-borne telescope. Three sources were detected and resolved. Two of the sources were identified with strong 2-micron sources that were also associated with radio continuum emission. The far-infrared flux is consistent with radiation from dust heated by an early B star. Previous 2-micron observations have indicated the presence of a large number of early B stars embedded in the dark cloud; the far-infrared observations indicate, however, that although some early B stars are in the dark cloud, most of the 2-micron sources are either behind the cloud or are stars not on the main sequence.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 206; June 15
    Format: text
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  • 9
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    New infrared-CO source in M8 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A far-infrared map of the M8 region at 69 microns with a 1-arcmin resolution shows an unresolved source 19 arcmin east of the main component. This source is a strong near-infrared emitter, with K = 4.8 and K - L = 2.6 mag. An intense peak in (C-12)O emission (brightness temperature about 36 K) coincides with the new infrared source. Comparison of millimeter-wave and infrared observations suggest that this source is an extremely young compact H II region. Evidence for a depletion of dust opacity inside the H II region is also found.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal; 82; Feb. 197
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    NASA TECHNICAL REPORTS
  • 10
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    Continuous sterilization of plumbing systems (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Continuous sterilization of plumbing, such as in hospitals, clinics, and biological testing laboratories is possible with ethylene oxide/Freon 12 (ETO/F-12) humidifier developed for sterilization of potable water systems.
    Keywords: MATERIALS
    Type: KSC-11085 , NASA Tech Briefs (ISSN 0145-319X); 4; 1; P. 77
    Format: text
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