Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..350p&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 350-363.
Astronomy and Astrophysics
Astronomy
50
Binary Stars, Shot Noise, Stellar Spectra, X Ray Sources, X Ray Spectra, Autocorrelation, Black Holes (Astronomy), Compton Effect, Cross Correlation, Data Processing, Proportional Counters, Rocket-Borne Instruments, Spectrum Analysis
Scientific paper
An energy- and time-resolved observation of Cyg X-1, sensitive from 0.15 to 20 keV, is reported which was performed to investigate the spectrum and time variability of the flux at low X-ray energies. Data in the band from 1.5 to 42 keV, obtained in two previous rocket flights, are reanalyzed to search for any energy dependence of the time signature. No such energy dependence is found, so the explanation of the observed low-energy excess of Cyg X-1 as emission from an extended region separate from the high-energy source is rendered untenable. The evident stability of the power-law spectrum of Cyg X-1 through the observed shot-noise variation is shown to suggest that the spectrum has a Comptonization origin. It is concluded that there is no obvious analogy to be made between Cyg X-1 and X-ray bursters.
Boldt Elihu
Garmire Gordon P.
Holt Stephen S.
Priedhorsky William
Rothschild Richard
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