AGN Variability

Details AGN Variability AGN Variability

1998-11-19

arxiv.org/abs/astro-ph/9811302v1

Astronomy and Astrophysics

Astrophysics

8 pages LaTeX, including 4 figures (paspconf.sty and epsf.sty); Invited review talk at the IAU Symp.194 on "Activity in galaxi

Scientific paper

Number of monitoring observations of continuum emission from Active Galactic Nuclei (AGNs) have been made in optical--X-ray bands. The results obtained so far show (i) random up and down on timescales longer than decades, (ii) no typical timescales of variability on shorter timescales and (iii) decreasing amplitudes as timescales become shorter. The second feature indicates that any successful model must produce a wide variety of shot-amplitudes and -durations over a few orders in their light curves. In this sense, we conclude that the disk instability model is favored over the starburst model, since fluctuations on days are hard to produce by the latter model. Inter-band correlations and time lags also impose great constraints on models. Thus, constructing wavelength and time dependent models remains as a future work.

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