Quasi-periodic oscillations in X-ray emission from the Seyfert galaxy NGC5548

Details Quasi-periodic oscillations in X-ray emission from the Seyfert galaxy NGC5548 Quasi-periodic oscillations in X-ray emission from the Seyfert galaxy NGC5548

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.361..233p&link_type=abstract

Nature (ISSN 0028-0836), vol. 361, no. 6409, p. 233-236.

Computer Science

30

Active Galactic Nuclei, Cosmic X Rays, Galactic Radiation, Oscillations, Seyfert Galaxies, Noise Spectra, Power Spectra

Scientific paper

Archival Exosat observations of the bright Seyfert galaxy NGC5548 are analyzed, and a broad peak is found in the power spectrum which corresponds to quasi-periodic oscillations (QPOs) with a period of about 500 s. Both the frequency and the magnitude of the QPOs vary systematically with total X-ray luminosity. Similar behavior has been seen in compact Galactic X-ray binaries, and it is suggested that intensity-correlated QPOs may be a generic feature of accretion onto a compact object. If the QPOs in the NGC5548 derive from instability or variability in an accretion disk around a black hole, the black hole mass can be only a few hundred thousand solar masses, an uncomfortably small number for most AGN models.

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