Black hole spin constraints for Cyg X-1 from XRISM Resolve data are strongly model-dependent, ranging from a*~0.99 with relxill to a*~0 with relxillCp or reflkerrD.
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NuSTAR and NICER data on SAX J1808.4-3658 show the accretion disk truncating to ~23 R_g in 2025 with magnetospheric radius exceeding co-rotation radius, indicating a possible transition to the propeller regime while accretion continues as evidenced by a Type-I burst.
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Model dependence of XRISM black-hole spin constraints in Cyg X-1
Black hole spin constraints for Cyg X-1 from XRISM Resolve data are strongly model-dependent, ranging from a*~0.99 with relxill to a*~0 with relxillCp or reflkerrD.
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Probing the accretion geometry of the transient accreting millisecond pulsar SAX J1808.4-3658: transitions to the propeller regime
NuSTAR and NICER data on SAX J1808.4-3658 show the accretion disk truncating to ~23 R_g in 2025 with magnetospheric radius exceeding co-rotation radius, indicating a possible transition to the propeller regime while accretion continues as evidenced by a Type-I burst.