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  • ASTROPHYSICS  (3)
  • 1975-1979  (3)
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  • 1
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    Unknown
    Detection of soft X-ray emission from SMC X-1 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The observation of 0.25-keV X-rays from SMC X-1 by a soft X-ray experiment aboard OSO 8 is reported. The variable soft X-ray source observed is identified with the hard X-ray source SMC X-1 on the basis of a rather abrupt ending to the emission (fall time about 2.5 hr) at the time SMC X-1 was expected to enter eclipse. A source luminosity of about 5 x 10 to the 38th erg/s in the 0.18-0.28-keV range is derived by assuming a distance of 68 kpc and correcting for attenuation by 3.4 x 10 to the 20th H atoms per sq cm of intervening galactic gas; this luminosity is shown to be about a factor of 40 greater than the observed coincident luminosity in the 0.8-3-keV band. The soft X-ray intensity upon emergence from eclipse is found to be reduced by a factor of at least 20 from the peak intensity prior to eclipse. It is suggested that this asymmetry may reflect a geometry in which the soft X-ray source trails the compact star as in an accretion-stream model.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 228
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Spatial distribution and broad-band spectral characteristics of the diffuse X-ray background, 0.1 - 1.0 keV (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Preliminary maps covering more than 85 percent of the sky are presented for three energy bands: the B band, the C band, and the M band. The study was undertaken to find evidence that most of the diffuse X-ray background at energies less than 1 keV is local to the galaxy and that it is most probably due to thermal radiation from a low density plasma which fills a substantial fraction of interstellar space. A preliminary analysis of the data is provided including a report that most of the B and C band flux has a common origin, probably in a 10 to the 6th power K region surrounding the Sun, and that most of the M band flux does not originate from the same material.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-162763 , NO-102 , Intern. Cosmic Ray Conf.; Aug 01, 1979; Kyoto
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Three-band observations of the soft X-ray background and some implications of thermal emission models (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The galactic component of the very soft diffuse X-ray background in three bands, covering the energy ranges of approximately 100 to 188 eV, 150 to 284 eV, and 500 to 850 eV, is mapped primarily at middle and low galactic latitudes. Intense regions on the maps are identified, and the dissimilarity of the three maps is shown to indicate spectral as well as intensity variations over the sky. Three emission-mechanism models involving hot gas at a single temperature are examined, a multitemperature model is found to be required, and several such models based on hot gas in a steady state or in equilibrium are considered. The problem of overpressure raised by Shapiro and Field (1976) is briefly discussed.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
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