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• W3100333673 abstract "We report the first clear evidence for the simultaneous presence of a low-frequency break and a QPO in the fluctuation power spectrum of a well-known ultraluminous X-ray source (ULX) in M82 using long XMM-Newton observations. The break occurs at a frequency of 34.2 mHz. The QPO has a centroid at νQPO = 114.3 ± 1.5 mHz, a coherence Q ≡ νQPO/ΔνFWHM ≃ 3.5, and an amplitude (rms) of 19% in the 2-10 keV band. The power spectrum is approximately flat below the break frequency and then falls off above the break frequency as a power law with the QPO superposed. This form of the power spectrum is characteristic of the Galactic X-ray binaries (XRBs) in their high or intermediate states. M82 X-1 was likely in an intermediate state during the observation. The EPIC pn spectrum is well described by a model comprising an absorbed power law (Γ ~ 2) and an iron line at ~6.6 keV with a width σ ~ 0.2 keV and an equivalent width of ~180 eV. Using the well-established correlations between the power and energy spectral parameters for XRBs, we estimate a black hole mass for M82 X-1 in the range of ~25-520 M☉, including systematic errors that arise due to the uncertainty in the calibration of the photon spectral index versus QPO frequency relation." @default.
• W3100333673 created "2020-11-23" @default.
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• W3100333673 date "2006-01-10" @default.
• W3100333673 modified "2023-10-14" @default.
• W3100333673 title "Black Hole Mass of the Ultraluminous X-Ray Source M82 X-1" @default.
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• W3100333673 doi "https://doi.org/10.1086/499235" @default.
• W3100333673 hasPublicationYear "2006" @default.
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