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

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

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 journal › Article › peer-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 language	English
Pages (from-to)	694-696
Journal	Nature
Volume	325
Publication status	Published - 1 Feb 1987

Keywords

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

Access to Document

http://adsabs.harvard.edu/abs/1987Natur.325..694L

Cite this

@article{a76b06639ddf4409a45906d294456074,

title = "Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051",

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.",

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

author = "A. Lawrence and Watson, {M. G.} and Pounds, {K. A.} and M. Elvis",

year = "1987",

month = feb,

day = "1",

language = "English",

volume = "325",

pages = "694--696",

journal = "Nature",

issn = "0028-0836",

publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Low-frequency divergent X-ray variability in the Seyfert galaxy NGC4051

AU - Lawrence, A.

AU - Watson, M. G.

AU - Pounds, K. A.

AU - Elvis, M.

PY - 1987/2/1

Y1 - 1987/2/1

N2 - 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.

AB - 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.

KW - Galactic Radiation

KW - Seyfert Galaxies

KW - Spaceborne Astronomy

KW - X Ray Astronomy

KW - Active Galactic Nuclei

KW - Exosat Satellite

KW - Light Curve

KW - Power Spectra

KW - Shot Noise

M3 - Article

VL - 325

SP - 694

EP - 696

JO - Nature

JF - Nature

SN - 0028-0836

ER -

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

Abstract

Keywords

Access to Document

Fingerprint

Cite this