An upper limit on ultraviolet shot noise from Cygnus X-1

Details An upper limit on ultraviolet shot noise from Cygnus X-1 An upper limit on ultraviolet shot noise from Cygnus X-1

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..255d&link_type=abstract

Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 255-258.

Astronomy and Astrophysics

Astrophysics

Binary Stars, Shot Noise, Ultraviolet Radiation, Ultraviolet Spectra, X Ray Sources, Autocorrelation, Cosmic Dust, Interstellar Matter, Periodic Variations, Stellar Luminosity, Ultraviolet Filters, Ultraviolet Photometry

Scientific paper

Rapid 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.

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