THE CONTRIBUTIONS OF RSCVN SYSTEMS TO THE DIFFUSE-X-RAY BACKGROUND

Citation
R. Ottmann et Jhmm. Schmitt, THE CONTRIBUTIONS OF RSCVN SYSTEMS TO THE DIFFUSE-X-RAY BACKGROUND, Astronomy and astrophysics, 256(2), 1992, pp. 421-427
Citations number
27
Language
INGLESE
art.tipo
Article
Journal title
ISSN journal
0004-6361
Volume
256
Issue
2
Year of publication
1992
Pages
421 - 427
Database
ISI
SICI code
0004-6361(1992)256:2<421:TCORST>2.0.ZU;2-A
Abstract
We present comprehensive calculations of the contribution of RSCVn bin aries to the diffuse X-ray background. We consider luminosity distribu tion functions derived from both optically selected volume-limited and X-ray selected flux-limited samples, use the Bahcall-Soneira galaxy m odel to describe the spatial distribution of stars in the Galaxy, and take into account anisotropic absorption by the interstellar medium. O ur principal results are that RSCVn binaries provide approximately 16% to the observed low-latitude background at intermediate X-ray energie s (1-2 keV), while in the 2-6 keV band their contribution to the total background amounts to approximately 6%, which however represents a ap proximately 27% contribution to the galactic ridge excess emission. Th is additional stellar component thus helps to fill up the absorption d ip in the extragalactic background produced by absorption in the Galax y and to isotropise the total M band background. However, our models o f RSCVn systems are unable to account for the iron line observed in th e galactic ridge.