The soft and medium-energy X-ray variability of NGC 5548: a reanalysis of EXOSAT observations.
Abstract
The authors carried out cross-correlation function (CCF) and power spectrum re-analysis of the X-ray light curves of the bright Seyfert 1 galaxy NGC 5548 obtained with EXOSAT. The CCF peaks are in all cases consistent with the absence of delays between X-ray variations at different energies. This is unlike the results found by several authors based on the same data. A detailed search for quasi-periodic oscillations (QPOs), using a new technique for the detection of QPOs even in the presence of source noise variability, did not find significant peaks above the 95% confidence detection threshold. The authors discuss and compare their results with those of Papadakis and Lawrence (1993).
- Publication:
-
Roentgenstrahlung from the Universe
- Pub Date:
- February 1996
- Bibcode:
- 1996rftu.proc..511T
- Keywords:
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- Seyfert Galaxies: X-Ray Variations;
- Seyfert Galaxies: X-Ray Light Curves