X ray AGN variability with hour to month timescales

Details X ray AGN variability with hour to month timescales X ray AGN variability with hour to month timescales

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..871a&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 871-876 (SEE N90-258

Astronomy and Astrophysics

Astronomy

11

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Power Spectra, Variability, Astronomical Models, Background Radiation, Light Curve, Stellar Flares, Time Dependence, X Ray Spectra

Scientific paper

Periodic flares and dips in the Active Galactic Nuclei (AGN) X-ray light curves are explained by bright spots on an accretion disk surface. For a disk seen almost edge-on the spots are eclipsed or Doppler beamed and this occasionally produces short sequences of repeated dips or flares. Spots located in a narrow range of radii, produce distinct peaks in the variability power spectra. When the range is broad, a power spectrum is produced with beta = 7/3 for spots with long lifetimes on a Keplerian disk. Short lifetimes and non-Keplerian rotation are consistent with beta between 1 and 2.

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