Bifurcation timescales in power spectra of black hole binaries and ultraluminous X-ray sources

Details Bifurcation timescales in power spectra of black hole binaries and ultraluminous X-ray sources Bifurcation timescales in power spectra of black hole binaries and ultraluminous X-ray sources

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53s.177w&link_type=abstract

Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.177-182

Astronomy and Astrophysics

Astronomy

Black Hole Binary, Ultraluminous X-Ray Source, Power Spectral Density, Data Analysis

Scientific paper

For black hole binaries (BHBs) and active galactic nuclei (AGNs), bifurcation timescales (BTs) Δ t b exist, below which time-domain power is significantly higher than the corresponding Fourier power. Quasi-periodic oscillations (QPOs) are removed from the Fourier spectra of BHBs. A relationship between BT, black hole mass and bolometric luminosity is derived. Strong anti-correlation between BT and luminosity of Cyg X-1 is found. After removing the QPOs, BTs are also obtained for two ultraluminous X-ray sources (ULXs), M82 X-1 and NGC5408 X-1. The results support that they harbor intermediate mass black holes (IMBHs).

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