Rapid X-ray variability of the Seyfert galaxy MCG-6-30-15

Details Rapid X-ray variability of the Seyfert galaxy MCG-6-30-15 Rapid X-ray variability of the Seyfert galaxy MCG-6-30-15

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221p...7p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, July 1, 1986, p. 7P-12P.

Astronomy and Astrophysics

Astronomy

44

Emission Spectra, Periodic Variations, Seyfert Galaxies, Spaceborne Astronomy, X Ray Spectra, Exosat Satellite, Light Curve, Variability

Scientific paper

Strong and continuous variability was detected in the X-ray emission of the Seyfert I galaxy MCG-6-30-15 during a 9 hr EXOSAT observation in July 1984. Changes in the 2-6 keV flux appear quasi-sinusoidal with a modulation depth of 40-50 percent and peak-to-trough time-scales as short as 1500 s. Although less well determined, due to a lower counting rate and to filter cycling, correlated changes are also seen in the EXOSAT low-energy telescope, covering the energy band about 0.1-1.5 keV. No significant lag or lead of greater than about 1000 s is seen between the medium- and low-energy variations. A simple power law plus low-energy cut-off does not given an acceptable fit to the time-averaged spectrum, unless the line-of-sight absorbing column is surprisingly low; a separate soft spectral component, thermal or power law, being strongly preferred.

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