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

A. Lawrence, M. G. Watson, K. A. Pounds, M. Elvis

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)694-696
JournalNature
Volume325
Publication statusPublished - 1 Feb 1987

Keywords

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

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