New Insight into AGN by Combining Spectral and Timing Information
Files
Links to Files
Permanent Link
Author/Creator
Author/Creator ORCID
Date
Type of Work
Department
Program
Citation of Original Publication
Staubert, R., et al. "New Insight into AGN by Combining Spectral and Timing Information." Astro. Lett. and Communications 39 (1999): 53–56.
Rights
This is the submitted manuscript of an article published by Taylor & Francis in Astro. Lett. and Communications on 1999.
Subjects
Abstract
A case is made for combining spectral and timing analysis of X-ray data in order to better understand the physics at work in Active Galactic Nuclei (AGN). In analysing X-ray light curves from long EXOSAT ME observations of a sample of AGN with a new technique (assuming a stochastic behaviour of the sources) we determine characteristic variability time constants and nd that there is a signi cant correlation with the 2 - 10 keV spectral index (K onig et al. 1997). This establishes a relationship between the photon index of the X-ray spectrum, T , and the fastness of the variability. Similar relations have been noted between T and the variability amplitude (Green et al. 1993, Fiore et al. 1998).