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Table 1

Restrictions on the parameters M and a of the black hole in the microquasar GRO J1655-40 given by the geodesic QPO models applied to the simultaneously observed twin HF QPOs and LF QPO.

Model νU νL νlow M/M a r/rg (MminMmax) /M aminamax

RP νφ νφνr νφνθ 5.3 ± 0.1 0.286 ± 0.004 5.68 ± 0.05 4.1–17.8 0.22–0.38
RP1 νθ νφνr νφνθ 4.9 ± 0.1 0.284 ± 0.004 5.81 ± 0.05 4.1–8.6 0.31–0.54
RP2 νφ νθνr νφνθ 5.5 ± 0.1 0.276 ± 0.003 5.56 ± 0.05 4.1–13.4 0.19–0.33

ER ν θ ν r νφνθ 3.0 ± 0.1 0.496 ± 0.020 8.15 ± 0.17 1.9–7.1 0.87–0.96
ER1 ν θ νθνr νφνθ 5.1 ± 0.1 0.274 ± 0.003 5.67 ± 0.05 4.1–11.2 0.25–0.43
ER2 νθνr ν r νφνθ 2.6 ± 0.1 0.194 ± 0.002 6.40 ± 0.03 2.3–6.6 0.87–0.07
ER3 νθ + νr ν θ νφνθ 7.0 ± 0.1 0.439 ± 0.022 5.86 ± 0.12 4.8–16.3 0.00–0.24
ER4 νθ + νr νθνr νφνθ 6.8 ± 0.1 0.288 ± 0.003 5.22 ± 0.02 5.6–13.4 0.00–0.03
ER5 ν r νθνr νφνθ 1.9 ± 0.1 0.274 ± 0.005 7.96 ± 0.06 1.5–5.5 0.98–1.00

TD νφ + νr ν φ νφνθ 7.3 ± 0.1 0.477 ± 0.026 5.92 ± 0.13 4.8–17.3 0.00–0.24
WD 2νφνr 2(νφνr) νφνθ 7.4 ± 0.3 0.490 ± 0.008 5.94 ± 0.11 4.8–16.9 0.00–0.24

Notes. The last two columns are related to the twin HF QPO models considered without the relation to the low frequency QPO. Different models are used, namely: relativistic precession and its variants (RP, RP1), total precession (RP2), parametric resonance and its variants (ER), tidal disruption (TD) and warped disc (WD). Dimensionless units are used with rg = GM/c2.

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