Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..231k&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 231-236 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
5
Black Holes (Astronomy), Periodic Variations, Stellar Oscillations, Time Lag, X Ray Binaries, Emission Spectra, Japanese Space Program, Satellite Observation, Spectrum Analysis, Stellar Spectra, X Ray Astronomy
Scientific paper
Ginga observed the following black-hole candidates: Cyg X-1, LMC X-1, LMC X-3, GX339-4, GS2000+25 and GS2023+39. Observed properties about Quasi-Periodic Oscillation (QPO) and time variation of these black hole candidates are presented. The observed properties of the time variations of GX 339-4 and LMC X-1 suggest that the energy spectrum is composed of a soft and a hard component. The hard component of GX339-4 has two states. Rapid alternations of these states suggest that the size of the hard component emitting region is less than 2.8 times 10 to the 9th power cm. Significant time lags of high energy and also low energy X-rays in reference to the X-rays in the energy range between 2.3 keV were found. Cyg X-1 and GS2023+339 do not show QPO but they show violent time variation. These sources also show hard X-ray lags.
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