Chandra X-ray spectrum for GH500.30. The red solid line is the best-fit model (wabs*zwabs*zpowerlaw in XSPEC), with the data to model ratio shown in panel b. The inset panel shows the χ2 contours of the photon index Γ vs. column density at the 68%, 90% and 99% confidence levels (from the inside out). Panel c: data/model residuals after including a Gaussian line at Eobs = 1.52keV. Panel d: data/model residuals by fixing redshift at z = 3.1.
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