The Role of Comptonisation in Energy Spectra of Standard QPO Sources
Abstract
The spectral variability in the color-color diagram in Quasi-Periodic Oscillation (QPO) sources is discussed. The blackbody spectra comptonized by a hot electron plasma also fit the EXOSAT spectra of these sources. A parametrization of the color-color diagram indicates systematical parameter variations in all spectral branches. They can be decomposed in a variation of a single photon source and an extended hot electron cloud. The temperature of the photon source varies between 0.5 and 1.0 keV, the electron cloud has scattering depths between 3 and 7 and temperatures from 2.0 to 5.0 keV. Links to QPO models on the horizontal spectral branch and physical consequences of the model are discussed.
- Publication:
-
Two Topics in X-Ray Astronomy, Volume 1: X Ray Binaries. Volume 2: AGN and the X Ray Background
- Pub Date:
- November 1989
- Bibcode:
- 1989ESASP.296..601S
- Keywords:
-
- Compton Effect;
- Energy Spectra;
- Neutron Stars;
- Periodic Variations;
- Stellar Oscillations;
- X Ray Binaries;
- Black Body Radiation;
- Color-Color Diagram;
- Electron Clouds;
- X Ray Astronomy;
- X Ray Spectra;
- Astronomy