Frequency-dependent time lags in the X-ray emission of the Seyfert galaxy NGC 7469

Abstract

We report the discovery of time lags in the cross-spectra of the X-ray light curves of the Seyfert galaxy NGC 7469. This behavior is common in Galactic black hole and neutron star binaries, and is in the sense that harder X-rays are delayed with respect to the soft with a time lag approximately proportional to the Fourier period. At the longest period probed by our observation we find a time lag of approximately 3.5 hours between the 2-4 and 4-10 keV X-rays. A similar lag and period dependence is found comparing the 2-4 and 10-15 keV light curves, albeit with less significance. We find the coherence function of the light curves to be close to 1. The implications of these results for the X-ray production mechanism in active galactic nuclei (AGN) is discussed.

12 pages, 2 figures, accepted for Publication in ApJL

References in corpus (4)

• The Origin of the X-ray and Ultraviolet Emission in NGC 7469
• Testing Comptonizing coronae on a long BeppoSAX observation of the Seyfert 1 galaxy NGC 5548
• Temporal characteristics of the X-ray emission of NGC 7469
• Coronal cooling and its signatures in the rapid aperiodic variability of Galactic black-hole candidates

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