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• W2034679723 abstract "We report the discovery of a 200 mHz quasi-periodic oscillation (QPO) in the X-ray emission from a bright ultraluminous X-ray source (ULX), Holmberg IX X-1, using a long XMM-Newton observation. The QPO has a centroid at νQPO = 202.5 mHz, a coherence Q ≡ νQPO/ΔνFWHM ≈ 9.3, and an amplitude (rms) of 6% in the 0.2-10 keV band. This is only the second detection of a QPO from a ULX, after M82 X-1, and provides strong evidence against beaming. The power spectrum is well fitted by a power law with an index of ≈0.7. The total integrated power (rms) is ≈9.4% in the 0.001-1 Hz range. The X-ray spectrum shows clear evidence of a soft X-ray excess component that is well described by a multicolor disk blackbody (kTin ~ 0.3 keV) and a high-energy curvature that can be modeled either by a cutoff power law (Γ ~ 1; Ecutoff = 9 keV) or as a strongly Comptonized continuum in an optically thick (τ ≈ 7.3) and cool (kTe ≈ 3 keV) plasma. Both the presence of the QPO and the shape of the X-ray spectrum strongly suggest that the ULX is not in the high/soft or thermally dominated state. A truncated disk and inner optically thick corona may explain the observed X-ray spectrum and the presence of the QPO." @default.
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• W2034679723 date "2006-03-28" @default.
• W2034679723 modified "2023-09-26" @default.
• W2034679723 title "Quasi-periodic Oscillations and Strongly Comptonized X-Ray Emission from Holmberg IX X-1" @default.
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• W2034679723 doi "https://doi.org/10.1086/504258" @default.
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