Encounters
Coordinate Time ○｜encounter｜ENC｜20260912181021-01-•
Theoretical work aimed at explaining HFQPOs is motivated by the following empirical result that is based on a very small sample of three sources: XTE J1550–564, GRO J1655–40 and GRS 1915+105. These sources are presently the only ones that both exhibit harmonic (3:2) HFQPOs and have measured BH masses. As shown in Figure 12, their frequencies appear to scale inversely with mass (McClintock & Remillard 2006), which is the dependence expected for coordinate frequencies (see Merloni et al. 1999) or for diskoseismic modes in the inner accretion disk (Wagoner 1999; Kato 2001). If these HFQPOs are indeed GR oscillations, then Figure 12 further suggests that the three BHs have similar values of the spin parameter . Obviously it is of great importance to attempt to confirm this result by obtaining the requisite frequency and mass measurements for additional sources.
Source: Remillard & McClintock 2006 ┃ X-Ray Properties… ⚬𓂃
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