Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..865a&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 865-870 (SEE N90-258
Astronomy and Astrophysics
Astronomy
5
Active Galactic Nuclei, Light Curve, Power Spectra, Time Series Analysis, Variability, X Ray Spectra, Background Radiation, Computerized Simulation, Data Processing, Noise Spectra, Spectrum Analysis
Scientific paper
Long timescale medium energy light curves are constructed for a number of Active Galactic Nuclei (AGN), using data primarily from EXOSAT, Einstein, HEAO-1, and Ariel 5. Power spectra for these light curves were compared to the spectra of identically sampled simulated light curves with known spectral properties. It is concluded that reliable results can be obtained for some of the brighter AGN. Results for NGC 4151 are presented. This power spectrum is combined with a short timescale EXOSAT power spectrum to search for a characteristic timescale at low frequencies. It is found that the power spectrum of NGC 4151 is similar to 1/f noise on long timescales, but the sharp turnover seen in Cygnus X-1 is not observed.
Abraham Roberto G.
McHardy Ian M.
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