Encounters
laor ⚬ˣˢᵖᵉᶜ｜encounter｜ENC｜20260912174421-01-•
The line has been modeled in the spectra of several BHBs. In some systems the inner disk radius deduced from the line profile is consistent with the radius of the ISCO of a Schwarzschild BH, suggesting that rapid spin is not required (e.g., GRS 1915+105, Martocchia et al. 2002; V4641 Sgr, Miller et al. 2002a). On the other hand, fits for GX 339–4 indicate that the inner disk likely extends inward to , implying (Miller et al. 2004). XTE J1650–500 is the most extreme case with the inner disk edge located at , which suggests nearly maximal spin (Miller et al. 2002c; Miniutti et al. 2004). Large values of have also been reported for XTE J1655–40 and XTE J1550–564 (Miller et al. 2005). Sources of uncertainty in the method include the placement of the continuum, the model of the fluorescing source, and the ionization state of the disk (Reynolds & Nowak 2003). Also, thus far the analyses have been done using the LAOR model in XSPEC, which fixes the spin parameter at (Laor 1991). A reanalysis of archival data using new XSPEC models that allow one to fit for may prove useful (KY, Dovciak et al. 2004; KD, Beckwith & Done 2004).
Source: Remillard & McClintock 2006 ┃ X-Ray Properties… ⚬𓂃
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