Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..935f&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 935-938 (SEE N90-258
Astronomy and Astrophysics
Astronomy
1
Power Spectra, Stellar Spectra, Variability, X Ray Spectra, Background Radiation, Black Holes (Astronomy), Exosat Satellite, Noise Spectra, Seyfert Galaxies, Spectrum Analysis, X Ray Sources
Scientific paper
The results of an accurate harmonic analysis of five EXOSAT observations of the Seyfert galaxy NGC 6814 carried out over a 2 year period are presented. The detection of the 12,200 s periodic signal with its rich harmonic structure, during the longest (approximately 1 day) observation is confirmed. A strong peak at 0.0004 Hz is found in the composed power spectrum of all the observations, revealing that this phenomenon is characteristic of the X-ray emission from this source at least over 2 years. The power spectrum of the longest observation has a continuous component similar to those observed in other Seyfert galaxies.
Fiore Fabrizio
Massaro Enrico
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