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  • ASTRONAUTICS (GENERAL)  (2)
  • Astronomy  (1)
  • 1
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    The history of IUE (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The early organizational and development history of the NASA-ESA-SERC International UV Explorer (IUE) satellite observatory is reviewed. Consideration is given to the progress of UV astronomy prior to the launch of the IUE in 1978; the initial feasibility and design studies; preliminary proposals (e.g., UVAS) and the reasons for their rejection; the designs selected for the telescope, spectrographs, detectors, and attitude-control system; the preflight preparations; and the commissioning phase.
    Keywords: ASTRONAUTICS (GENERAL)
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Cosmology and the Cosmic Background Explorer (COBE) (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: COBE, planned for launch aboard a Delta rocket, is NASA's first space mission specifically designed to study the diffuse IR and microwave background radiation. COBE has three instruments for performing precision measurements of the spectrum and angular distribution of the 3 K cosmic background radiation and for making an all-sky survey of the diffuse IR emission at wavelengths of 1-300 microns. COBE will carry differential microwave radiameters to search for anisotropies to a sensitivity per 7-deg pixel of 0.15 mK at frequencies of 53 and 90 GHz and of 0.3 mK at 32 GHz.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 89-0410
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    NASA TECHNICAL REPORTS
  • 3
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    Faint Object Spectrograph Spectra of the UV Emission Lines in NGC 5558: Detection of Strong Narrow Components (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 were obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope on 1992 July 5, when the UV continuum and broad emission lines were at their lowest ever observed level. The high resolution of the spectra, relative to previous UV observations, and the low state of NGC 5548 allow the detection and accurate measurement of strong narrow components of the emission lines of Ly alpha, C IV 1549, and C III 1909. Isolation of the UV narrow components enables a detailed comparison of narrow-line region (NLR) properties in Seyfert 1 and 2 galaxies, and removal of their contribution is important for studies of the broad-line region (BLR). Relative to the other narrow lines, C IV 1549 is much stronger in NGC 5548 than in Seyfert 2 galaxies, and Mg II 2798 is very weak or absent.
    Keywords: Astronomy
    Type: NASA-CR-202592 , NAS 1.26:202592 , The Astrophysical Journal; 416; L67-L70
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    NASA TECHNICAL REPORTS
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