Table 1
Properties of the three microquasars GRO 1655-40, GRS 1915+105, and XTE 1550-564.
| Source | νL [Hz] | νU [Hz] | Mass [M⊙] | a |
|
|
||||
| GRO 1655-40 | 300 | 450 | 6.0–6.6 a | 0.96–0.99 |
|
|
||||
| GRS 1915+105 | 113 | 168 | 10.0–18.0 b | 0.68–0.99 |
|
|
||||
| XTE 1550-564 | 184 | 276 | 8.4–10.8 | 0.89–0.99 |
Notes. The individual columns display the frequencies of the lower and upper QPO peaks (Strohmayer 2001a,b; Remillard et al. 2002, 2003), the mass estimates (Greene et al. 2001; Greiner et al. 2001; Orosz et al. 2002; McClintock & Remillard 2006), and the spin values inferred from the epicyclic resonance model assuming a geodesic accretion flow.
Alternative predictions of the black hole mass in GRO 1655-40 are 5.1−5.7M⊙ (Beer & Podsiadlowski 2002) and 5.8−6.8M⊙ (Greene et al. 2001).
For GRS 1915+105, Reid et al. (2014) have recently obtained a tighter mass estimate, 10.6 − 14.4M⊙, based on a trigonometric parallax measurement of the distance (see also Steeghs et al. 2013).
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