Relativistic distortions in the X‐ray spectrum of Cyg X‐1

摘要: ABSTRA C T We present the first significant detection of relativistic smearing X-ray reflection spectrum from putative accretion disc in low/hard state Cyg X-1. The ionization and amount are simultaneously constrained by spectra, we conclude that is not strongly ionized, does generally extend down to last stable orbit at 3 Schwarzschild radii, covers rather less than half sky as seen Xray source. These results consistent with a geometry where optically thick truncates few tens inner region occupied X-ray-hot, thin(nish) plasma. Such also inferred previous studies reflected Galactic black hole transient sources, detailed considerations overall continuum spectral shape, suggesting this robust feature on holes.