Quasi-Periodic Oscillation ·
X-ray heartbeat
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.com · van der Klis 1985 · 3:2 HFQPO · ν
K
≈ 220 Hz · 10 M☉/M
Q = ν₀/Δν
HFQPO
3 : 2
phase
—
X-ray flux / horizon
Disk + Keplerian orbit
Power spectrum
Spin axis / precession
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