Time variations of X rays from black hole candidates: Canonical time variations in high and low intensity states

Details Time variations of X rays from black hole candidates: Canonical time variations in high and low intensity states Time variations of X rays from black hole candidates: Canonical time variations in high and low intensity states

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..353m&link_type=abstract

In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 353-357 (SEE N94-22624 05-75)

Astronomy and Astrophysics

Astronomy

1

Black Holes (Astronomy), Power Spectra, Stellar Radiation, X Ray Astronomy, X Ray Spectra, X Ray Stars, Emission Spectra, Novae, Stellar Physics, Variations

Scientific paper

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 a Z source of low mass binaries: GX5-1. In GS1124-683, the following states were recognized: a high flare state, a high quiet state, a high to low transition state, and a low state. Canonical time variations of X rays were observed not only in the low state but also in the high flare state. In the high 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 (PSD) functions: 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 components 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. In the low state GS2023+338 had the same X ray energy spectrum and the same normalized PSD to the other black hole candidates.

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