Kepler Observations of Rapid Optical Variability in Active Galactic Nuclei

Details Kepler Observations of Rapid Optical Variability in Active Galactic Nuclei Kepler Observations of Rapid Optical Variability in Active Galactic Nuclei

2011-11-02

arxiv.org/abs/1111.0672v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted by Astrophysical Journal Letters, 31 Oct 2011

Scientific paper

Over three quarters in 2010-2011, Kepler monitored optical emission from four active galactic nuclei (AGN) with ~30 min sampling, >90% duty cycle, and <~0.1% repeatability. These data determined the AGN optical fluctuation power spectral density functions (PSDs) over a wide range in temporal frequency. Fits to these PSDs yielded power law slopes of -2.6 to -3.3, much steeper than typically seen in the X-rays. We find evidence that individual AGN exhibit intrinsically different PSD slopes. The steep PSD fits are a challenge to recent AGN variability models but seem consistent with first order MRI theoretical calculations of accretion disk fluctuations.

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