Submillisecond measurements of the low state of Cygnus X-1

Details Submillisecond measurements of the low state of Cygnus X-1 Submillisecond measurements of the low state of Cygnus X-1

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..818r&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 818-826.

Astronomy and Astrophysics

Astronomy

28

Bursts, Periodic Variations, Spectrum Analysis, Stellar Spectra, X Ray Sources, Binary Stars, Energy Spectra, Fourier Analysis, Pulsed Radiation, Shot Noise, Time Constant, X Ray Astronomy, X Ray Spectra

Scientific paper

Cygnus X-1 was observed on two occasions separated by a year by the same Goddard X-ray rocket payload. High-resolution temporal and spectral data reveal that Cyg X-1 was essentially unchanged in these two observations a year apart; the bursts of millisecond duration observed in the earlier flight were observed in the second as well. Analysis of these bursts has failed to reveal any internal temporal structure, either luminous or spectral. The shot-noise character of temporal fluctuations on time scales of at least 1 s can be explained by the presence of exponential pulses with a time constant of a fraction of a second and a rate near 8 per sec. The possible connection of these pulses with the bursts is examined.

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