Time variations of X-rays from black hole candidates. Canonical time variations in high and low intensity states.
Abstract
Time variations of X-rays from a black hole candidate GS1124-683 are described and compared with other black hole candidates: Cyg X-1, GX339-4, GS2023+338 and GX5-1. In GS1124-683, four states, i.e. a high flare state, a high quiet state, a high-to-low transition state and a low state were recognized. Canonical time variations of X-rays were observed not only in the low state but also in the high flare state. In the high (flare and quiet) state, the X-rays consist of two components: a soft disk black body component and a power law component. These two components have different power spectrum density functions (PSD); a flat top noise and a power law noise. In the low state, the X-rays consist of a power law component. This component has a harder energy spectrum and shows different and larger time variations than those of the power law component in the high state. GS2023+338 in its flare state had a different normalized PSD and harder energy spectra than GS1124-683 in its high flare state, though in the low state GS2023+338 had the same X-ray energy spectrum and the same normalized PSD to the other black hole candidates.
- Publication:
-
Plasma Physics and Controlled Nuclear Fusion (ITC-4)
- Pub Date:
- May 1993
- Bibcode:
- 1993ppcn.conf..353M
- Keywords:
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- X-Ray Binaries: Black Holes;
- Black Holes (Astronomy);
- Power Spectra;
- Stellar Radiation;
- X Ray Astronomy;
- X Ray Spectra;
- X Ray Stars;
- Emission Spectra;
- Novae;
- Stellar Physics;
- Variations;
- Astrophysics