Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051

Details Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051 Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..694l&link_type=abstract

Nature (ISSN 0028-0836), vol. 325, Feb. 19, 1987, p. 694-696.

Astronomy and Astrophysics

Astronomy

152

Galactic Radiation, Seyfert Galaxies, Spaceborne Astronomy, X Ray Astronomy, Active Galactic Nuclei, Exosat Satellite, Light Curve, Power Spectra, Shot Noise

Scientific paper

An uninterrupted 62-hr observation of the nearby low luminosity type 1 Seyfert galaxy NGC4051 with the EXOSAT observatory is reported which gives an order of magnitude improvement in the quality of the time series and allows comparison with X-ray binaries. The observed power spectral density is roughly proportional to 1/f, similar to Cyg X-1, and characteristic of turbulent processes. No preferred timescale or luminosity gradient has been seen so far. If this behavior holds generally for active galactic nuclei, quantities derived from short samples will be subject to selection effects.

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