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  • 1
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    A new measurement of the Her X-1 X-ray pulse profile (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A triple peaked 1.24 sec. pulse profile in a 1-minute rocket borne exposure to Her X-1 was measured, in contrast to the doublepeaked profiles expected from models which maximize the X ray emission at the magnetic equator of an accreting neutron star. The profile exhibits statistically significant energy dependence, with the emission approximately greater than 12 keV having narrower peaks which lag (by approximately 5% of the pulse period) the corresponding peaks at lower energies. Approximately one third of the total emission from the source is nonpulsed.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-70578 , X-661-74-11
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    What is special about Cygnus X-1? (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The X-ray evidence from several experiments is reviewed, with special emphasis on those characteristics which appear to distinguish Cygnus X-1 from other compact X-ray emitting objects. Data are examined within the context of a model in which millisecond bursts are superposed upon shot-noise fluctuations arising from events of durations on the order of a second. Possible spectral-temporal correlations are investigated which provide additional evidence that Cygnus X-1 is very likely a black hole.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-70791 , X-661-74-3
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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