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An upper limit on ultraviolet shot noise from Cygnus X-1Rapid photometry of Cygnus X-1 through an ultraviolet filter centered on 0.35 micron has been obtained at 100-ms sampling intervals. The autocorrelation function of these data has been examined for shot noise analogous to the behavior of the X-ray light curve. The ultraviolet data are entirely consistent with white noise. Considering randomly occurring ultraviolet shots with the same duration (0.5 s) and average rate (1 per sec) as the X-ray shots, a 3-sigma upper limit on the ratio of optical to X-ray energies per shot is estimated to be 0.13, before the ultraviolet light is attenuated by interstellar dust. This limit is then generalized for shots of arbitrary duration and rate.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Duthie, J. G.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Mcmillan, R. S.
(NASA Marshall Space Flight Center Space Sciences Laboratory, Huntsville, Ala., United States)
Date Acquired
August 9, 2013
Publication Date
August 15, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Accession Number
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