Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009scchg..52..788w&link_type=abstract
Science in China Series G: Physics, Mechanics and Astronomy, Volume 52, Issue 5, pp.788-793
Astronomy and Astrophysics
Astronomy
1
Galaxies: Nuclei, X-Rays: Galaxies, Methods: Data Analysis
Scientific paper
The power spectral densities (PSDs) for a sample of active galactic nuclei (AGNs) are analyzed in both the frequency domain and the time domain. We find for each object that for broadband noise a character timescale-bifurcation timescale of Fourier and time-domain PSD exists in the 103-106 s range, below which the time-domain power spectrum is systematically higher than the corresponding Fourier spectrum. The relationship between bifurcation timescale, AGN mass and luminosity is studied. Compared with the fact that similar phenomena have been found for Galactic black hole candidates (GBHs) with bifurcation timescale ˜0.1 s but not for accreting neutron stars, our finding indicates that AGNs and GBHs have common intrinsic nature in rapid X-ray variability with a character time parameter scaled with their masses
Liu Yuan
Wang Taishan
Wu Yuxiang
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