Correlation between variability time scale and X-ray spectral index in AGN.

Details Correlation between variability time scale and X-ray spectral index in AGN. Correlation between variability time scale and X-ray spectral index in AGN.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326l..25k&link_type=abstract

Astronomy and Astrophysics, v.326, p.L25-L28

Astronomy and Astrophysics

Astrophysics

12

X-Rays: Galaxies

Scientific paper

We have analysed EXOSAT ME X-ray light curves of a sample of AGN assuming a stochastic process in these sources. The result is a significant anti-correlation between the relaxation timescale τ, derived from this stochastic model fit, and the photon index {GAMMA} of the X-ray spectrum. This establishes for the first time a relationship between variability properties and spectral properties of the emitted X-ray flux of AGN. Even though the physical mechanism for the variations is far from clear, models employing the stochastic superposition of discrete events appear most promising. We propose Comptonization as a possible cause for the relationship.

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