On Possible Long-Period Pulsations in the Hard X-Ray Flux of Cygnus X-1
Abstract
Fourier analysis performed on the data of three balloon observations (20 200 keV) of Cygnus X-1 has shown a significant peak of the power spectral density at about 17 s. Possible periodic pulsations, sustained over periods of at least one hour, could be responsible for the peak we detected. Results of computer simulations in terms of a superposition of randomly occurring pulses give some support to this interpretation.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- June 1976
- DOI:
- 10.1007/BF00645540
- Bibcode:
- 1976Ap&SS..42..185F
- Keywords:
-
- Binary Stars;
- Fourier Analysis;
- Power Spectra;
- Pulsed Radiation;
- Radiant Flux Density;
- X Ray Sources;
- Black Holes (Astronomy);
- Pulse Duration;
- Spectral Energy Distribution;
- Time Series Analysis;
- Astrophysics