Kerr-MOG accretion disk spectra are softer than Kerr at fixed spin due to outward ISCO shift from the fifth-force parameter α, with an observational upper limit α < 0.044 from LMC X-1 data.
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RGS spectra of V4641 Sgr reveal narrow N and O lines from a dense, multi-phase, photoionized disk atmosphere with log ξ ≈ 3.1 and 0.36 and velocities 540-720 km/s.
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Relativistic Thermal Emission from Accretion Disks in Kerr-MOG Spacetimes
Kerr-MOG accretion disk spectra are softer than Kerr at fixed spin due to outward ISCO shift from the fifth-force parameter α, with an observational upper limit α < 0.044 from LMC X-1 data.
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Dense, multi-phase accretion disk atmosphere in the low-luminosity state of black hole transientV4641 Sgr
RGS spectra of V4641 Sgr reveal narrow N and O lines from a dense, multi-phase, photoionized disk atmosphere with log ξ ≈ 3.1 and 0.36 and velocities 540-720 km/s.