Presentation details
» X-ray emission of cataclysmic variables observed by INTEGRAL
Presentation duration: 15 minutes
Presenter: Rudolf Galis
Cataclysmic variables and especially intermediate polars represent significant fraction of all INTEGRAL detections in hard X-ray / soft gamma ray. We processed all available observational data from INTEGRAL/IBIS and INTEGRAL/JEM-X for selected IPs and we analysed long-term variability as well as the composite spectra (3 - 100 KeV) of these sources. Our analysis showed that the fluxes of some IPs are long-term variable, mainly in (15 - 25) and (25 - 40) keV bands. Moreover this hard X-ray / soft gamma ray variability is correlated with the changes in optical spectral band. The broad-band spectra of surveyed IPs can be well fitted by a thermal bremsstrahlung model (kT ~ 20 - 25 keV), with reflection from an optically thick cold medium (the surface of the white dwarf) in some cases.
Coauthors:- S. Paltani
- D. Eckert
- F. Münz
- M. Kocka