Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..499l&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 499-503 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
30
Active Galactic Nuclei, Galactic Radiation, Noise Spectra, Power Spectra, Variability, Astronomical Models, Shot Noise, Time Series Analysis, X Ray Astronomy, X Ray Spectra
Scientific paper
The power spectra of a sum of shot noises is calculated. The logarithmic power spectral slopes of -1 to -2 which are produced last for several decades, similar to published power spectra of time series of several X ray active galaxies. Because of a low frequency flattening, and high frequency steepening of the spectrum, the total power in the spectra remains finite. To explain the published power spectra, time ranges of 3000 in the decay times of pulses are required. The pulse activity region spans at least 3.5 orders of magnitude. The variability timescales are not connected to the light travel timescales. Assuming a pulse creation and an emission mechanism, other constraints to the physical conditions around the central engine can be set.
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