A stochastic model for the variability of NGC 6814

Details A stochastic model for the variability of NGC 6814 A stochastic model for the variability of NGC 6814

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..163v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 1, p. 163-167.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Models, Periodic Variations, Seyfert Galaxies, Stochastic Processes, X Ray Sources, Active Galactic Nuclei, Light Curve, Pair Production

Scientific paper

The X-ray variability of the Seyfert galaxy NGC 6814 is investigated in the context of stochastic dynamics applied to the pair production instability model of Moskalik & Sikora (1986). The quasi-periodicity present in the light curve can be easily reproduced and quite naturally accounted for by assuming that the accretion rate undergoes random time variations. Although some features of time variability, like the red-noise component, are not explained within our simplified physical picture, the present results indicate that stochastic dynamics could be a powerful tool in constructing viable models for the emitting region of active galactic nuclei.

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