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  • ASTROPHYSICS  (4)
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  • 1
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    Gamma ray pulsars (1977)
    In:  CASI
    Details
    Publication Date: 2006-08-09
    Description: Data from the SAS-2 high-energy gamma-ray experiment reveal the existence of four pulsars emitting photons above 35 MeV. An attempt is made to explain the gamma-ray emission from these pulsars in terms of an electron-photon cascade that develops in the magnetosphere of the pulsar. Although there is very little material above the surface of the pulsar, the very intense magnetic fields (10 to the 12th power gauss) correspond to many radiation lengths which cause electrons to emit photons by magnetic bremsstrahlung and which cause these photons to pair-produce. The cascade develops until the mean photon energy drops below the pair-production threshold which is in the gamma-ray range; at this stage, the photons break out from the source.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 109-118
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    NASA TECHNICAL REPORTS
  • 2
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    An upper limit on the high-energy gamma-ray emission of Vela X-1 (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The possibility of high-energy gamma-ray emission from the X-ray binary Vela X-1 was investigated by analyzing the COS-B satellite observations, using the COS-B X-ray detector for a phase coherent analysis in the search of rotational periodicity. The rotational upper limit is compared to the X-ray, TeV, and PeV fluxes reported by Chodil et al. (1967), North et al. (1984), and Protheroe et al. (1984), respectively. It was found that, under certain conditions, the upper limit determined here is not inconsistent with the reports of TeV and PeV emission.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 226; 1, De
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    NASA TECHNICAL REPORTS
  • 3
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    A search for X-ray emission from a nearby pulsar - PSR 1929 + 10 (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of the radio pulsar PSR 1929 + 10 with the Exosat observatory are reported. A 2 sigma upper limit of 0.0005 cts/s was obtained in the 0.04-2.4 keV range, which translates into a luminosity upper limit of 2 x 10 to the 29th erg/s for a power-law source with photon number index 1-3, and a luminosity upper limit of 10 to the 30th erg/s corresponding to a temperature of 190,000 K for a blackbody with radius 10 km. The implications of these upper limits for various models and their compatibility with the positive detection of this source by the Einstein Observatory are discussed.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 177; 1-2; 101-104
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    NASA TECHNICAL REPORTS
  • 4
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    Pulsed X-rays from the Vela pulsar (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: An unambiguous detection by the Rosat satellite of pulsed X-ray emission from the Vela pulsar is reported. The pulse signal is soft, appearing mainly at energies less than 1 keV. The Rosat observations resolve the two sources of emission and show that the pointlike emission centered on the pulsars is soft, whereas the emission from the compact nebula is hard. The observations show that Vela more closely resembles older pulsars that the archetypal young pulsar embedded in an SNR.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 361; 6408; p. 136-138.
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    NASA TECHNICAL REPORTS
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