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Table 1.
Frequencies and inferred emission radii of the kHz QPOs.
| Source | Sz(a) | ν2(b) | r(c) | Reference |
|---|---|---|---|---|
| (Hz) | (km) | |||
| Cyg X-2 | ∼ − 0.09−1.13 | ∼735−1015 | ∼17.4−21.5 | Wijnands et al. (1998a) |
| GX 5-1 | ∼0.67−1.25 | ∼507−888 | ∼19.0−27.6 | Wijnands et al. (1998b) |
| GX 5-1 | ∼0.12−1.10 | ∼478−866 | ∼19.3−28.7 | Jonker et al. (2002) |
| GX 17+2 | ∼0.08−1.45 | ∼647−1087 | ∼16.6−23.4 | Wijnands et al. (1997a) |
| GX 17+2 | ∼ − 0.32−1.76 | ∼618−1087 | ∼16.6−24.1 | Homan et al. (2002) |
| GX 17+2 | ∼0.16−1.16 | ∼623−963 | ∼18.0−24.0 | Lin et al. (2012) |
| Sco X-1 | ∼1.25−2.09 | ∼1050−1135 | ∼16.1−17.0 | van der Klis et al. (1996) |
Notes.
(c)
r: Emission radius of the kHz QPO (magnetosphere-disk radius) inferred from Eq. (2) with the assumed NS mass of M ∼ 1.6 M⊙.
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