Discovery of a 0.8-mHz quasi-periodic oscillation in the transient X-ray pulsar SXP31.0 and associated timing transitions

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Table 3.

Best-fit parameters of the QPO and shoulder components in the PDS model.

Parameter	NuObs1	ArtObs1
ν_QPO, mHz	$0 . 80_{- 0.04}^{+ 0.11}$ $0.80^{+0.11}_{-0.04}$	0.9 ± 0.1
Q_QPO	$3 . 2_{- 1.8}^{+ 10.6}$ $3.2^{+10.6}_{-1.8}$	$2 . 8_{- 1.7}^{+ 6.5}$ $2.8^{+6.5}_{-1.7}$
QPO frac. rms, %	14 ± 5	$10_{- 1}^{+ 3}$ $10^{+3}_{-1}$
ν_shoulder, mHz	$1 . 5_{- 1.2}^{+ 1.9}$ $1.5^{+1.9}_{-1.2}$
Q_shoulder	$2_{- 2}^{+ 20}$ $2^{+20}_{-2}$
Shoulder frac. rms, %	$12_{- 2}^{+ 6}$ $12^{+6}_{-2}$

Notes. For NuObs1, the PDS was computed from the first 32.8 ks of the observation, where the QPO is most prominent.

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