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  • Other Sources  (11)
  • 2000-2004
  • 1970-1974  (11)
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  • 1
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    SAS-2 observations of gamma rays from the galactic plane (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Preliminary data are given for the SAS-2 high energy galactic gamma ray observation. These data include both latitude and longitude distributions. The longitude distribution shows a high density region. The latitude distributions toward the center and the anti-center are markedly different, the former showing a two-component structure of half-widths of approximately 3 and 6 deg. The energy spectrum in the range 35 to 200 MeV is hard, consistent with cosmic ray interactions with interstellar matter, including neutral pions decay and emission from energetic electron interactions. The data is consistent with an interpretation in terms of the confinement of the cosmic rays in the spiral arms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 201-204
    Format: text
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  • 2
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    Observations of discrete gamma ray sources with SAS-2 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Compact gamma ray sources centered on the Crab nebula and the Vela X supernova remnant are considered. An excess in the galactic radiation was observed in both regions. Data indicate that a large fraction of this flux is pulsed. The excess from the Vela region could reflect either a large-scale galactic feature, such as a superposition of spiral arm segments, or it could be associated with the Vela supernova remnant. Low-energy gamma ray bursts were observed in the SAS-2 anticoincidence shielding.
    Keywords: SPACE RADIATION
    Type: ESRO The Context and Status of Gamma Ray Astronomy; p 273-277
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  • 3
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    Galactic arm structure and gamma-ray astronomy (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: In an attempt to explain the observed unexpectedly high-energy gamma-radiation over a broad region of the galactic plane in the general direction of the galactic center, a model is proposed wherein the galactic cosmic rays are preferentially located in the high-matter-density regions of galactic arm segments, as a result of the weight of the matter in these arms tying the magnetic fields and hence the cosmic rays to these regions. The presently observed longitudinal distribution of galactic gamma-rays can be explained with the current estimate of the average galactic matter density, if the average ratio of arm to interarm matter is 5:1 for the major arm segments toward the galactic center from the sun, and if the cosmic-ray density normalized to its local value is assumed to be directly proportional to the matter density.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 189; Apr. 15
    Format: text
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  • 4
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    Gamma radiation from the Crab Nebula above 35 MeV (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE RADIATION
    Type: Nature; 251; Oct. 4
    Format: text
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  • 5
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    SAS-2 observations of the high-energy gamma radiation from the Vela region (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 190; June 1
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  • 6
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    SAS-2 observations of the high energy gamma radiation from the Vela region (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data from a scan of the galactic plane by the SAS-B high energy gamma ray experiment in the region 250 deg smaller than 12 smaller than 290 deg show a statistically significant excess over the general radiation from the galactic plane for gamma radiation of energy larger than 100 MeV. If the enhanced gamma radiation results from interactions of cosmic rays with galactic matter, as the energy spectrum suggests, it seems reasonable to associate the enhancement with large scale galactic features, such as spiral arm segments in that direction, or with the region surrounding the Vela supernova remnant with which PSR 0833-45 is associated. If the excess is attributed to cosmic rays released from the supernova interacting with the interstellar matter in that region, than on the order of 3 x 10 to the 50th power ergs would have been released by that supernova in the form of cosmic rays.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70602 , X-662-74-58
    Format: application/pdf
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  • 7
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    SAS-2 observations of the galactic gamma radiation from the Vela region (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data from a scan of the galactic plane by the SAS-2 high energy gamma ray experiment in the region 250 deg l2 290 deg show a statistically-significant excess over the general radiation from the galactic plane for gamma radiation of energy 100 MeV in the region 260 deg l2 270 deg and -7.5 deg b2 0 deg. If the enhanced gamma radiation results from interactions of cosmic rays with galactic matter, as the energy spectrum suggests, it seems reasonable to associate the enhancement with large scale galactic features, such as spiral arm segments in that direction, or with the region surrounding the Vela supernova remnant, with which PSR 0833-45 is associated. If the excess is attributed to cosmic rays released from this supernova interacting with the interstellar matter in that region, then on the order of 3.10 to the 50th power ergs would be released by that supernova in the form of cosmic rays.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-72582
    Format: application/pdf
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  • 8
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    High energy gamma ray results from the second small astronomy satellite (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A high energy (35 MeV) gamma ray telescope employing a thirty-two level magnetic core spark chamber system was flown on SAS 2. The high energy galactic gamma radiation is observed to dominate over the general diffuse radiation along the entire galactic plane, and when examined in detail, the longitudinal and latitudinal distribution seem generally correlated with galactic structural features, particularly with arm segments. The general high energy gamma radiation from the galactic plane, explained on the basis of its angular distribution and magnitude, probably results primarily from cosmic ray interactions with interstellar matter.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70761 , X-662-74-304
    Format: application/pdf
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  • 9
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    Gamma radiation from the Crab nebula above 35 MeV (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electromagnetic radiation from the Crab nebula were observed, showing that the Crab is unique among strong X-ray sources in that major component in the low energy range (1 to 10 KeV) shows little or no temporal variation. Observations of the Crab above 35 MeV were made with the high energy gamma ray telescope flown on SAS-2. The detector and technique are described in detail.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70734 , X-662-74-236
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  • 10
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    High energy galactic gamma radiation from cosmic rays concentrated in spiral arms (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A model for the emission of high energy ( 100 MeV) gamma rays from the galactic disk was developed and compared to recent SAS-2 observations. In the calculation, it is assumed that (1) the high energy galactic gamma rays result primarily from the interaction of cosmic rays with galactic matter; (2) on the basis of theoretical and experimental arguments the cosmic ray density is proportional to the matter density on the scale of galactic arms; and (3) the matter in the galaxy, atomic and molecular, is distributed in a spiral pattern consistent with density wave theory and the experimental data on the matter distribution.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70818 , X-662-75-2 , High energy galactic gamma radiation from commic rays concentrated in spiral arms; Dec 01, 1974; Greenbelt, MD; United States
    Format: application/pdf
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