Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..696m&link_type=abstract
Nature (ISSN 0028-0836), vol. 325, Feb. 19, 1987, p. 696-698.
Physics
136
Fractals, Galactic Radiation, Seyfert Galaxies, X Ray Sources, Active Galactic Nuclei, Exosat Satellite, Power Spectra
Scientific paper
The results of a three-day EXOSAT observation of the Seyfert galaxy NGC5506 are reported in which continuous rapid variation was detected. Power spectral analysis and fractal analysis both demonstrate that the variability is self-similar, that is, scale invariant, over nearly three decades of frequency, a range similar to that covered by pre-EXOSAT observations of bright galactic sources. If this behavior is typical of all AGN, then the concept of a 'two-folding' timescale is meaningless unless the fractal dimension of the general variability, as well as the specific time interval over which a specific change in flux occurs, are all noted. There is no evidence for any variation in the X-ray spectrum as a function of intensity, and it is shown how this places strong constraints on the emission mechanism, favoring nonthermal models involving shocks.
Czerny Bozena
McHardy Ian
No associations
LandOfFree
Fractal X-ray time variability and spectral invariance of the Seyfert galaxy NGC5506 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fractal X-ray time variability and spectral invariance of the Seyfert galaxy NGC5506, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fractal X-ray time variability and spectral invariance of the Seyfert galaxy NGC5506 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1013704