The soft and medium-energy X-ray variability of NGC 5548: a reanalysis of EXOSAT observations.

Details The soft and medium-energy X-ray variability of NGC 5548: a reanalysis of EXOSAT observations. The soft and medium-energy X-ray variability of NGC 5548: a reanalysis of EXOSAT observations.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..511t&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 511 - 512

Astronomy and Astrophysics

Astrophysics

Seyfert Galaxies: X-Ray Variations, Seyfert Galaxies: X-Ray Light Curves

Scientific paper

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).

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