Caption: A simulated X-IFU X-ray spectrum of a medium bright (fluence= 0.4 × 10^-6 erg cm^-2) afterglow at z = 7, characterized by deep narrow resonant lines of Fe, Si, S, Ar, Mg, from the gas in the environment of the GRB. An effective intrinsic column density of 2 × 10²² cm^-2 has been adopted.

Additional comments: The simulation was performed using earlier X-IFU response files at the time of the preparation of the Athena supporting science papers. Updating the model and simulation information has been requested. Note however that the new response files should not affect dramatically the result.

Credits for data/References:  Data for the plot are courtesy of Luigi Piro (07/16).

Creation date: 02/05/2019. Version #: 3.

Credits: X-IFU Consortium. Copyrights: © DB/X-IFU.