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  • 1
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    Ionization and heating of the Gum Nebula by energetic particles from the Vela X supernova (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Gum Nebula ionization and heating by energetic particles from Vela X supernova
    Keywords: SPACE SCIENCES
    Type: ; 104-111. (
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  • 2
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    Galaxy formation associated with active galaxies and the binding of rich clusters. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A mechanism is proposed for recent formation of dwarf galaxies in the vicinity of active radio galaxies. In the cores of rich clusters these dwarf galaxies are stripped of gas and eventually suffer tidal disruption. This leads us to suggest that the Coma cluster of galaxies may be bound by intergalactic halo-type stars.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 244; Aug. 13
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  • 3
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    X-ray observations of characteristic structures and time variations from the solar corona - Preliminary results from Skylab. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Examples taken from the S-054 X-ray telescope observations made during the first Skylab mission show the hot coronal plasma tracing the configuration of the magnetic fields. The high spectral resolution and sensitivity of the instrument has enabled the following two facts to be more firmly established: (1) that the 'quiet homogeneous corona' is in fact highly structured and that the structures observed appear to be the results of dispersed active region magnetic fields; and (2) that numerous bright points are distributed randomly on the disk. Their presence at high latitudes may play a role in solar cycle models. In addition, the capability of Skylab for studying time evolution has enabled the restructuring of coronal features to be seen at times of high activity, indicating a restructuring of the coronal magnetic fields.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 185; Oct. 1
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  • 4
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    Dust cooling of hot gas. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The cooling rates of a hot gas by ion-grain collisions are shown to be significant at temperatures above 1 million K. The importance of this cooling mechanism in certain phases of supernova explosions is noted. High-temperature modifications of this cooling mechanism in astronomical sources are discussed. A cooling curve is plotted for collisionally ionized gas containing cosmic abundances of heavy elements and graphite grains.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 184; Sept. 15
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  • 5
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    A study of galaxy groups and clusters - The case for a clumpy intergalactic medium. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A nonuniform model for a dense intergalactic medium is constructed under the assumption that all groups and clusters of galaxies are gravitationally bound by ionized gas. Catalogs by de Vaucouleurs and Abell are utilized to provide an almost complete sample of the spatial distribution of groups and clusters over a wide range of richness, and a distribution function is derived for galaxy groups and clusters as a function of velocity dispersion. A simple scaling law is applied to predict velocity dispersions for the very rich Abell clusters. Thermal bremsstrahlung emission from the intracluster gas accounts for the observed emission over 2 to 10 keV from several rich clusters, and also contributes up to 20% of the diffuse X-ray background over a considerable fraction of the observed range. The amount of X-ray emitting gas is restricted to a small fraction of the virial mass, with the remainder of the binding mass present as cooler ionized clouds. Available soft X-ray and ultraviolet diffuse background observations are used to define a narrow range of permissible temperatures and densities for these clouds.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 183; July 15
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  • 6
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    Ionization of the intercloud medium and the central disk regions of spiral galaxies. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 181; May 1
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  • 7
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    The case for a chaotic cosmogony. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The question of the significance of the galaxies for the structure and the evolution of the universe is considered, giving attention to the possibility that galaxies are merely local perturbations, superficialities in an otherwise homogeneous universe. Means of manufacturing galaxies in the context of Einstein's theory are examined. It appears that a wide range of possible anisotropic universes should generate a residual vorticity. Density fluctuations occur as a basis for the origin of galaxies.
    Keywords: SPACE SCIENCES
    Type: Comments on Modern Physics; vol. 5
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  • 8
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    The spectrum of the extranuclear regions of Ton 256. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 181; Apr. 1
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  • 9
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    Primordial random motions and angular momenta of galaxies and galaxy clusters. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: We study the decay of primordial random motions of galaxies and galaxy clusters in an expanding universe by solving a kinetic equation for the relaxation of differential energy spectra N(E, t). Systematic dissipative energy losses are included, involving gravitational drag by, and accretion of, intergalactic matter, as well as the effect of collisions with other systems. Formal and numerical solutions are described for two distinct modes of galaxy formation in a turbulent medium, corresponding to formation at a distinct epoch and to continuous formation of galaxies. We show that any primordial random motions of galaxies at the present epoch can amount to at most a few km/sec, and that collisions at early epochs can lead to the acquisition of significant amounts of primordial angular momentum.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 180; Mar. 15
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  • 10
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    Bright nebulae near concentrations of high-velocity gas. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Results of a systematic search for bright nebulae that are likely to be emission regions in the vicinity of high-velocity gas, drawing attention to some interesting coincidences that have been found. It is apparent that there is a tendency for many of the high-latitude nebulae to cluster in the vicinity of the high-velocity gas. Some of the most prominent cases of overlap are tabulated. It is emphasized that measurement of the radial velocity of the emission nebulae could confirm the existence of a physical association between high-latitude emission nebulae and high-velocity gas. The fact that Johnson (1972) had used narrow-band filters to find indications of H beta emission in similar high-latitude nebulae suggests that H alpha should readily be detectable with Fabry-Perot interferometry.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 175; Aug. 1
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