Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1111m&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 1111-1124 (SEE N90-2
Astronomy and Astrophysics
Astronomy
43
Active Galactic Nuclei, Energy Bands, Spectral Bands, Variability, X Ray Spectra, Black Holes (Astronomy), Exosat Satellite, Frequencies, Quasars, Satellite Observation, Stellar Mass Accretion, X Ray Sources
Scientific paper
The EXOSAT Medium Energy (ME) long looks of Active Galactic Nuclei (AGN) are reviewed. A variety of different types of behavior is seen, characterized by power spectra of different power law slopes. At high frequencies all slopes are steeper than -1 and so high frequency power is not divergent. Some sources maintain the same power spectral slope to lower frequencies but others gradually flatten and slopes near -1 are seen in the range 0.00001 to 0.0001 Hz. The variability is random, but not entirely scale-invariant. For sources with a strong soft Low Energy (LE) component there is a good correlation between the short timescale ME and LE lightcurves. There is a rough inverse correlation between luminosity and normalized variability amplitude implying that luminosity depends mainly on central mass, rather than just on accretion rate
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