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  • Other Sources  (7)
  • ASTRONOMY  (5)
  • MECHANICS  (2)
  • 1980-1984  (7)
  • 1
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    Supernova remnants in the Magellanic Clouds (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The present updated catalog of SNRs in the Large and Small Magellanic Clouds (LMC and SMC) incorporates remnants recently discovered as a result of coordinated X-ray, optical, and radio surveys, and contains 25 confirmed SNRs in the LMC and six in the SMC. Optical images are included for all of the new SNRs, together with X-ray isophotes for 24 of the SNRs in the LMC which have been obtained with the high resolution imager and imaging proportional counter of the Einstein Observatory. The cumulative number-diameter relation for Type II SNRs with D smaller than 50 pc in the LMC is N(D)= 0.36 D exp 1.0 + or 0.2, suggesting that the SNRs have evolved much faster than expected from Sedov theory and that the free expansion phase dominates their evolution up to diameters of 30-40 pc. SNR production frequencies in the LMC and SMC are calculated to be 1/275 and 1/800 years, respectively, or nearly equal to the galaxies' luminosity ratios.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 51; April 19
    Format: text
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  • 2
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    A soft X-ray study of the Large Magellanic Cloud (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is estimated on statistical grounds that of the 97 sources detected in a survey of the Large Magellanic Cloud (LMC) by means of the Einstein Laboratory's imaging X-ray telescope, less than 25 are likely to be either foreground stars or background quasars. The largest class of identified sources discovered is that of supernova remnants (SNRs). It is confirmed by means of high resolution maps that six more sources are also SNRs, and an additional 20 to 25 unidentified sources are suspected, in light of the available temporal, spatial and spectral information, to be SNRs. Of the remaining approximately 40 sources, about half are expected to be either background active galactic nuclei or foreground stars. The unexpectedly large number of SNRs found in the survey suggests that present knowledge of the galactic remnant population may be incomplete.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 248
    Format: text
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  • 3
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    A search for X-ray polarization in cosmic X-ray sources (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Fifteen strong X-ray sources were observed by the X-ray polarimeters on board the OSO 8 satellite from 1975 to 1978. The final results of this search for X-ray polarization in cosmic sources are presented in the form of upper limits for the 10 sources which have not been discussed elsewhere. These limits in all cases are consistent with a thermal origin for the X-ray emission.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 280; 255-258
    Format: text
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  • 4
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    Einstein Observations of the Cygnus Loop (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The imaging instruments on the Einstein Observatory were used to study the detailed X-ray structure of the Cygnus Loop. An arc minute resolution map of the 0.1-4.0 keV emission from the entire remnant was obtained with the imaging proportional counter (IPC). The bright northeastern and western limbs were mapped with the high resolution imager (HRI). The large-scale structure of the Loop is well modeled as a limb-brightened shell of hot gas at 2 x 10 to the 6th K created by the expansion of a blast wave into an inhomogeneous interstellar medium. The pulse-height data from the IPC indicate that the center of the remnant is generally hotter than the limb with temperatures as high as 4 x 10 to the 6th K. The X-ray maps show good general correlation with large-scale radio and optical structure, and in some cases good detailed correlation with faint optical filaments dominated by hydrogen line emission.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 278; 615-618
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  • 5
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    Faired instrumentation for aerodynamic tests (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Streamlined package is installed and removed without altering aerodynamic properties of structure being tested. Method uses lightweight materials so that blade balance is maintained.
    Keywords: MECHANICS
    Type: LAR-11201 , NASA Tech Briefs (ISSN 0145-319X); 4; 3; P. 404
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  • 6
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    Double Compton scatter telescope calibration (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Calibration techniques for a medium energy gamma ray telescope are described. Gain calibration using Compton edge spectra involves comparisons of pulse height spectra with spectra simulated by a Monte Carlo computer code which includes Compton scattering and pair production, plural scattering and variable energy resolution, and cell size. The telescope considered comprises 56 cells of liquid scintillator in four size groups, with a total liquid volume of 325 l; each cell has its own photomultiplier tube. Energy and angular resolutions and the PMT gain calibration procedure are verified with double scatter data for monoenergetic gamma rays at a known location. Detection probabilities for any cell combination in the two telescope arrays are calculated per steradian as a function of the scattering for a number of different energies with a Van de Graaff accelerator.
    Keywords: ASTRONOMY
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
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  • 7
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    Electrical Dissipation Measurement of Polymer Phase Transitions (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Technique measures solid/solid, glass/rubber, and liquid/liquid transition temperatures in polymers having dipole moments. Technique based on change in dipole packing that occurs with each transition and measured as change in electrical dissipation factor. Change in dipole packing occuring with each transition sensed by effect on dissipation factor.
    Keywords: MECHANICS
    Type: LAR-12861 , NASA Tech Briefs (ISSN 0145-319X); 7; 3; P. 298
    Format: text
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