Caption: Top) XMM-Newton RGS spectrum showing the absorption line of an intervening absorber at z= 0.3551 (Nicastro et al., 2018, Nature). Bottom) Simulated X-IFU spectrum of the same absorber. The plots show the ratio of the X-IFU data of the blazar 1ES 1553+113 with the local best-fitting continuum model, to highlight the two OVII He-α  and He-β absorption lines.

Additional comments: The simulation is performed with the response matrix of the X-IFU in which the spectral resolution at 1 keV is about 2.1 eV. The integration time is 160 ks, consistent with the observation listed in the Mock Observing Plan (v4). The XMM-Newton RGS observation from which the simulation is derived was 1.75 Ms long. 

Credits for data/References: Nicastro, F. et al., 2018, Observations of the missing baryons in the warm-hot intergalactic medium, Nature, Volume 558, Issue 7710, p.406-409. The simulation data used for the plot are courtesy of F. Nicastro (11/2018).

Creation date: 04/12/2018. Version #: 3.

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