Black Hole Surprise: Evolving X-ray Signal Hints at Accretion Mystery
The research identifies the first instance of evolving LFQPO features in Swift J1727.8−1613 above 40 keV during the HIMS, making it the third known black hole X-ray binary to exhibit significant LFQPO (>1 Hz) detection at higher energies (∼100 keV).
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