A hidden quasi-periodic oscillation in Cygnus X-1 revealed by NICER

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Table 3.

Energies of the rms and phase-lag extrema.

Region	ν_QPO [Hz]	$E_{\max}^{rms}$ $E_{\mathrm{max}}^{\mathrm{rms}}$ [keV]	$E_{\min}^{lag}$ $E_{\mathrm{min}}^{\mathrm{lag}}$ [keV]
Z3	1.5	1.9 ± 0.1	0.7 ± 0.1
Z4	1.8	1.8 ± 0.2	0.7 ± 0.1
Z5	2.2	2.4 ± 0.1	0.9 ± 0.1
Z6	3.3	2.5 ± 0.2	1.3 ± 0.1
Z7	5.1	3.8 ± 0.1	1.4 ± 0.1
Z8	6.0	3.5 ± 0.1	2.0 ± 0.1

Notes. Energies of the maximum of the covariance rms amplitude and minimum of the phase lags for each region of the HID of Cygnus X-1 where the imaginary QPO (ν_QPO) is detected (see Fig. 6). Uncertainties are estimated at the 1σ level.

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