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Model Dependence of XRISM Black Hole Spin Constraints in Cyg X-1

  • Authors: Andrzej A. Zdziarski, Swadesh Chand, Michał Szanecki, Gulab Dewangan, Barbara De Marco

Andrzej A. Zdziarski et al 2026 The Astrophysical Journal Letters 1005 .

  • Provider: AAS Journals

Caption: Figure 7.

The NICER (green), Resolve (black), and NuSTAR (blue and red) data-to-model ratios for the fit with the two-reflkerrD model, covering the full NuSTAR spectral range, 3–79 keV. We observe a substantial excess of Resolve counts in the Fe K range compared with NuSTAR and NICER. In cyan symbols, we also show the Xtend 0.5–10 keV spectrum unfolded with that model (not fitted).

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