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  • SPACE SCIENCES  (6)
  • Astrophysics  (1)
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  • 1
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    Mariner 9 ultraviolet spectrometer experiment - Stellar observations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Photoelectric spectra have been obtained for a number of early-type stars in the 1100- to 2000-A region with the Mariner 9 UV spectrometer. The resonance lines of H I, Si IV, and C IV are easily identified, as are features due to C II, C III, Si III, Fe II N IV. The absolute energy distribution derived from the data lie about 20% below those of OAO-2 in the 1200- to 2000-A region.
    Keywords: SPACE SCIENCES
    Type: Science; 175; Jan. 21
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    NASA TECHNICAL REPORTS
  • 2
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    Mariner 9 ultraviolet spectrometer experiment - Measurements of the Lyman alpha sky background (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: During the flight of Mariner 9 to Mars, the ultraviolet spectrometer on board the spacecraft measured the L-alpha intensity for several points in the sky. These data are compared with a sky map obtained by OGO-5 and the observations of Mariner 6. The absolute calibration of Mariner 9 and Mariner 6 differ by a factor of 1.43 at L-alpha. The low values of the sky brightness measured by Mariner 9 near the sky minimum suggest that the nearby interstellar medium has a kinetic temperature of 200-1100 K and a relative velocity with respect to the sun in the range 13-14 km/sec.
    Keywords: SPACE SCIENCES
    Type: Astronomy and Astrophysics; 28; 3, No; Nov. 197
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  • 3
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    Mariner 9 ultraviolet spectrometer experiment - Interstellar absorption at Lyman alpha in OB stars. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 182; May 15
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  • 4
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    Mariner 9 ultraviolet spectrometer experiment - Upper limits on the Lyman-alpha flux from clusters of galaxies. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data from the ultraviolet spectrometer on the Mariner 9 Mars orbiter have been used to set upper limits on the redshifted Lyman-alpha flux from the Perseus and Pegasus I (NGC 7619) clusters of galaxies. The limit for the Perseus cluster implies that the temperature of the intergalactic gas required for gravitational binding must be greater than 100,000 K, if it exists. A less severe limit is set for the Pegasus I cluster.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 182; May 15
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  • 5
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    Lyman-alpha measurements of neutral hydrogen in the outer geocorona and in interplanetary space. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results of hydrogen Lyman-alpha (1216 A) measurements made on a continuous basis by a two-channel photometer on Ogo 5 from March 1968 to June 1971. The highly elliptical orbit provided measurements of both the outer geocorona and of the 1216-A sky background emission, since geocoronal scattering is minimal at the apogee distance of 150,000 km. Selected data (through 1970) are presented, as well as an interpretation of the three principal discoveries to date - namely, (1) a pronounced antisolar enhancement of the geocoronal scattering beyond 70,000 km, which is regarded as evidence for a hydrogen 'geotail' produced by solar Lyman-alpha radiation pressure; (2) a clear correlation of periodic variations in the sky background emission with solar activity associated with solar rotation; and (3) an annual variation of the 1216-A sky background emission, caused by the earth's orbital motion within the cavity created by the solar wind in the nearby interstellar hydrogen.
    Keywords: SPACE SCIENCES
    Type: NSSDC-ID-68-014A-21-PM , Journal of Geophysical Research; 77; June 1
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  • 6
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    Rocket observations of Orion stars with an all-reflective ultraviolet spectrograph. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Far UV spectra of O and B stars in Orion photographed from Aerobee rocket, describing wavelength measurements and line identifications
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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  • 7
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    A New Probe of the Molecular Gas Content in Galaxies: Application to M101 (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Studies of nearby spiral galaxies suggest that photodissociation regions (PDRs) are capable of producing the observed large--scale distribution of HI (Allen et al.- 1997, and references therein). The column density of HI in a PDR is fundamentally linked to the amount of far--ultraviolet (FUV) emission produced by nearby young stars and the local molecular gas volume density. Measurements of the HI column density and the FUV emission associated with PDRs thus provide a new probe of the molecular gas distribution in nearby galaxies. Advantages of this method include its insensitivity to assumptions about the CO/{\rm H2} conversion factor or the gas temperature. We discuss the application of this method to M101. The HI column density and FUV emission have been measured for 35 PDRs from VLA data (Braun 1997) and Ultraviolet Imaging Telescope data (Waller et al.-1997). We derive volume densities ranging from n-100 {\rm cm(exp -3)} in the central HI--poor regions of M101 to n -3000 {\rm cm(exp -3)} in the HI--rich periphery of the galaxy.
    Keywords: Astrophysics
    Type: Between the Stars II: The ISM, Galactic and Extragalactic Display (Session 71); May 30, 1999 - Jun 03, 1999; Chicago, IL; United States
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