Simultaneous independent measurements of a truncated inner accretion disc

4PiSky Authors: Daniel Plant / Rob Fender

One question has polarised the black hole X-ray binary community for many years: is the inner accretion disc truncated in the low-hard state?

The inner radius of the accretion disc, fitted by the disc (x-axis; Method 2) and Fe line (y-axis; Method 1) components. The dot-dash line indicates the innermost stable circular orbit for a zero spin black hole, showing that both methods, from all three observations, are consistent with a truncated accretion disc.

The inner radius of the accretion disc, fitted by the Fe line (y-axis; Method 1) and disc (x-axis; Method 2) components. The dot-dash line indicates the innermost stable circular orbit for a zero spin black hole, showing that both methods, from all three observations, are consistent with a truncated accretion disc.

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