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  • SPACE RADIATION  (64)
  • 1990-1994  (7)
  • 1985-1989  (19)
  • 1965-1969  (38)
  • 1
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    Implications of the IRAS survey for Galactic gamma-ray astronomy (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Using the results of the IRAS far-infrared survey of the Galaxy, we have obtained the large-scale radial distributions of Galactic far infrared emission independently for both the Northern and Southern Hemisphere sides of the Galaxy. We find the dominant feature in these distributions to be a broad peak coincident with the '5 kpc' molecular gas cloud ring. We also find evidence of spiral arm features. Strong correlations are evident between the large scale Galactic distributions of far infrared emission, gamma-ray emission and CO emission. We find a particularly tight correlation between the distribution of warm molecular clouds and far-infrared emission on a Galactic scale.
    Keywords: SPACE RADIATION
    Type: In: High energy gamma-ray astronomy; Proceedings of the International Conference, Ann Arbor, MI, Oct. 2-5, 1990 (A93-25001 08-93); p. 20-24.
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  • 2
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    The blazar gamma-ray luminosity function and the diffuse extragalactic gamma-ray background (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We have used the data from the new EGRET catalog on 'grazars' (blazers which are observed to be high-energy gamma-ray sources), together with radio data, to construct a new relation between radio and gamma-ray luminosity for these sources. Using this relation to construct a grazar gamma-ray luminosity function, we then calculate the contribution of unresolved grazars to the cosmic gamma-ray background radiation. We derive the energy spectrum of this background component above 100 MeV and the angular fluctuations in this background implied by our model.
    Keywords: SPACE RADIATION
    Type: The Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 430; 1; p. L21-L24
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  • 3
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    TeV gamma rays from 3C 279 - A possible probe of origin and intergalactic infrared radiation fields (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The gamma-ray spectrum of 3C 279 during 1991 June exhibited a near-perfect power law between 50 MeV and over 5 GeV with a differential spectral index of -(2.02 +/- 0.07). If extrapolated, the gamma-ray spectrum of 3C 279 should be easily detectable with first-generation air Cerenkov detectors operating above about 0.3 TeV provided there is no intergalactic absorption. However, by using model-dependent lower and upper limits for the extragalactic infrared background radiation field, a sharp cutoff of the 3C 279 spectrum is predicted at between about 0.1 and about 1 TeV. The sensitivity of present air Cerenkov detectors is good enough to measure such a cutoff, which would provide the first opportunity to obtain a measurement of the extragalactic background infrared radiation field.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 390; 2, Ma
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  • 4
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    Cosmological significance of isotropic 1-100 MeV gamma radiation (1969)
    In:  CASI
    Details
    Publication Date: 2005-11-17
    Description: Isotropic 1-100 Mev gamma radiation and cosmic ray detection of cosmological significance
    Keywords: SPACE RADIATION
    Type: NIFICANT ACCOMPLISHMENTS IN SCI., 1968 1969; P 172-176
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  • 5
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    Gravitino decay and the cosmic gamma-ray background (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is argued that the cosmic gamma-ray background (CGB) spectrum does not exhibit evidence for the decay of light gravitinos, in contradiction to the suggestion by Olive and Silk (1985), who observed a bump near 1 MeV in the CGB radiation spectrum. It is suggested that better fits to the CGB spectrum would be provided by mechanisms generating a power-law spectrum which is flattened below about 2 MeV. Olive and Silk maintain that the decays of a long-lived particle such as the gravitino may be responsible for features in the gamma-ray spectrum near 1 MeV.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters (ISSN 0031-9007); 56; 2551; Au
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  • 6
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    The cosmic-ray antiproton spectrum from dark matter annihilation and its astrophysical implications - A new look (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The spectrum of antiprotons from dark matter annihilation are calculated using the Lund Monte Carlo program, and simple analytic expressions for the spectrum and low-energy antiproton/proton ratio are derived. Comparing the results with recent upper limits on low energy antiprotons, it is concluded that the reported 4-13 GeV antiproton flux cannot be accounted for by dark matter annihilation. The new upper limits do not provide useful constraints on dark matter particles. They restrict the annihilation rate and imply that annihilation gamma ray and e(+) fluxes would be far below the fluxes produced by cosmic-ray collisions. It may be possible to look for a dark matter halo annihilation signal at antiprotons energies below 0.5 GeV, where the flux from cosmic-ray collisions is expected to be negligible.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal (ISSN 0004-637X); 336; L51-L54
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  • 7
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    The galactic gamma-ray distribution - Implications for galactic structure and the radial cosmic-ray gradient (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The radial distribution of gamma ray emissivity in the Galaxy was derived from flux longitude profiles, using both the final SAS-2 results and the recently corrected COS-B results and analyzing the northern and southern galactic regions separately. The recent CO surveys of the Southern Hemisphere were used in conjunction with the Northern Hemisphere data, to derive the radial distribution of cosmic rays on both sides of the galactic plane. In addition to the 5 kpc ring, there is evidence from the radial asymmetry for spiral features which are consistent with those derived from the distribution of bright H II regions. Positive evidence was also found for a strong increase in the cosmic ray flux in the inner Galaxy, particularly in the 5 kpc region in both halves of the plane.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 471-478
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  • 8
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    Equilibrium spectra of secondary cosmic-ray positrons in the Galaxy and the spectrum of cosmic gamma-rays resulting from their annihilation. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Annihilation gamma ray spectra from equilibrium spectra of secondary galactic positrons
    Keywords: SPACE RADIATION
    Type: ; TROPHYSICAL JOURNAL
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  • 9
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    Predictions of extragalactic gamma ray fluxes between 1 and 100 Mev. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Extragalactic gamma ray fluxes predicted, discussing collisions, matter-antimatter annihilation and cosmological implications
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
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  • 10
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    Effect of photomeson production by the universal radiation field on high-energy cosmic rays. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Lifetime and attenuation mean free path of high energy cosmic rays, considering photomeson production effect
    Keywords: SPACE RADIATION
    Type: ; URNAL OF PHYSICS, PA
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