Short time-scale optical variability properties of the largest AGN sample observed with Kepler/K2
- Aranzana, E.
- Körding, E.
- Uttley, P.
- Scaringi, S.
- Bloemen, S.
DOIAbstract
We present the first short time-scale (∼hours to days) optical variability study of a large sample of active galactic nuclei (AGNs) observed with the Kepler/K2 mission. The sample contains 252 AGN observed over four campaigns with ∼30 min cadence selected from the Million Quasar Catalogue with R magnitude <19. We performed time series analysis to determine their variability properties by means of the power spectral densities (PSDs) and applied Monte Carlo techniques to find the best model parameters that fit the observed power spectra. A power-law model is sufficient to describe all the PSDs of our sample. A variety of power-law slopes were found indicating that there is not a universal slope for all AGNs. We find that the rest-frame ampli...
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